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Connecticut USGS 7.5 Minute Quadrangle Index Envelope (NAD83 Area)
SDE Feature Class - depgis.DEP.QUAD_INDEX_NAD83_AREA_ENVELOPE
FGDC, ESRI Metadata
DescriptionGraphicSpatialData StructureData QualityData SourceData DistributionMetadata
+ Resource Description
Citation
Information used to reference the data.
Title: Connecticut USGS 7.5 Minute Quadrangle Index Envelope (NAD83 Area)
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1999
Edition: 2005
Data type: vector digital data
Data location: http://www.ct.gov/deep
Other citation details:
The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. The 2005 Edition includes that same spatial data originally published in 1999 with the addition of metadata.
Description
A characterization of the data, including its intended use and limitations.
Abstract:
This is a 7.5-minute quadrangle index grid for a region defined by the rectangular envelope for Connecticut. The rectangular envelope is an area that includes quadrangles for Connecticut and the immediate area surrounding the state. Polygon features representing individual 7.5-minute quadrangle areas are based on Connecticut State Plane Coordinate System, North American Datum of 1983 (NAD83). They do not correspond exactly with the quadrangle boundaries published on the USGS 7.5-minute topographic quadrangle maps because the polygon feature boundaries on the published quadrangle maps are based on the Connecticut State Plane Coordinate System, North American Datum of 1927 (NAD27). Each polygon feature defines a geographic area that is slightly different than the area shown on the corresponding 1:24,000-scale USGS 7.5-minute topographic quadrangle map. Boundaries of the polygon features in this layer match the NAD83 reference tics shown at the corners of each quadrangle map. This index was generated by mathematically projecting the 7.5-minute latitude and longitude quadrangle corner coordinates to Connecticut State Plane Coordinate System, NAD83. It represents a true NAD83 index of 7.5-minute quadrangle areas. Polygon attribute information is comprised of codes to uniquely identify individual quadrangle areas. This is static information that is not subject to change.
Purpose:
Use this layer to define the 7.5-minute quadrangle grid for the greater Connecticut area based on the Connecticut State Plane Coordinate System, North American Datum of 1983 (NAD83) . All currently available quadrangle maps for Connecticut are based on (published in) NAD27. This layer is an index to a possible new series of 7.5 minute topographic quadrangle maps published by the USGS based on NAD83. Due to the change in horizontal datums, NAD83-based topographic quadrangle maps will cover slightly different geographic areas than the currently available set of USGS topographic quadrangle maps. The geographic area encompassed by USGS 7.5-minute quadrangle maps is based on a grid interval of 7.5 minutes of latitude and longitude. The quadrangle boundaries shown on the USGS 7.5 minute topographic quadrangle maps are generated by projecting the 7.5-minute latitude and longitude coordinates that define the corners of the 7.5 minute quadrangle maps to the Connecticut State Plane Coordinate System, NAD27, whereas the quadrangle index polygon boundaries for this layer are generated by projecting these same latitude and longitude coordinate values to the Connecticut State Plane Coordinate System, NAD83. Consequently, this layer represents a true NAD83 quadrangle index, but these quadrangle polygon boundaries are not exactly identical to and do not precisely lineup with the quadrangle boundaries printed on the current set of 1:24,000-scale USGS topographic quadrangle maps. For example, quadrangle index polygon boundaries running North-South (lines of longitude) are offset from the corresponding boundaries on the topographic quadrangle maps by about 125 feet, and the quadrangle index polygon boundaries running East-West (lines of latitude) are offset from the corresponding boundaries on the topographic quadrangle maps by about 35 feet. This discrepancy is expected because this layer's quadrangle index polygon features and the USGS topographic quadrangle maps are originally based two different horizontal datums (NAD83 and NAD27), resulting in the placement of latitude and longitude coordinate values at slightly different locations on the surface of the Earth. Use a different quadrangle index layer named USGS 7.5 Minute Quadrangle Index for quadrangle boundaries that correspond exactly with the boundaries of the USGS 7.5-minute topographic quadrangle maps.
Supplemental information:
In 2004, the State of Connecticut Department of Environmental Protection developed automated procedure to systematically create the USGS 7.5 Minute Quadrangle Index layer in order to officially document the process by which this layer was previously developed by this agency. This automated procedure was developed using ArcInfo Workstation 8.3 software and the Arc Macro Language (AML) as a scripting environment and recorded in an AML file named MAKEINDEX.AML for the USGS quadrangle map category of data for the State of Connecticut, Department of Environmental Protection. The MAKEINDEX.AML derives polygon features and assigns attribute information to these features based on information in three text files that specify and define polygon corner coordinates, polygon label point coordinates, and polygon attribute values.

CT DEP Quadrangle Numbers - The Connecticut Department of Environmental Protection established the following quadrangle numbers to uniquely identify 7.5 minute topographic quadrangle areas - Bashbish Falls MA-CT-NY (1), Ashley Falls MA-CT (2), South Sandisfield MA-CT (3), Tolland Center MA-CT (4), West Granville MA-CT (5), Southwick MA-CT (6), West Springfield MA-CT (7), Springfield South MA-CT (8), Hampden MA-CT (9), Monson MA-CT (10), Wales MA-CT (11), Southbridge MA-CT (12), Webster MA-CT (13), Oxford MA-CT-RI (14), Millerton NY-CT (15), Sharon CT-NY (16), South Canaan CT (17), Norfolk CT (18), Winsted CT (19), New Hartford CT (20), Tariffville CT-MA (21), Windsor Locks CT (22), Broad Brook CT (23), Ellington CT (24), Stafford Springs CT (25), Westford CT (26), Eastford CT (27), Putnam CT (28), Thompson CT-RI (29), Amenia NY-CT (30), Ellsworth CT (31), Cornwall CT (32), West Torrington CT (33), Torrington CT (34), Collinsville CT (35), Avon CT (36), Hartford North CT (37), Manchester CT (38), Rockville CT (39), Coventry CT (40), Spring Hill CT (41), Hampton CT (42), Danielson CT (43), East Killingly CT-RI (44), Dover Plains NY-CT (45), Kent CT (46), New Preston CT (47), Litchfield CT (48), Thomaston CT (49), Bristol CT (50), New Britain CT (51), Hartford South CT (52), Glastonbury CT (53), Marlborough CT (54), Columbia CT (55), Willimantic CT (56), Scotland CT (57), Plainfield CT (58), Oneco CT-RI (59), Pawling NY-CT (60), New Milford CT (61), Roxbury CT (62), Woodbury CT (63), Waterbury CT (64), Southington CT (65), Meriden CT (66), Middletown CT (67), Middle Haddam CT (68), Moodus CT (69), Colchester CT (70), Fitchville CT (71), Norwich CT (72), Jewett City CT (73), Voluntown CT-RI (74), Brewster NY-CT (75), Danbury CT (76), Newtown CT (77), Southbury CT (78), Naugatuck CT (79), Mount Carmel CT (80), Wallingford CT (81), Durham CT (82), Haddam CT (83), Deep River CT (84), Hamburg CT (85), Montville CT (86), Uncasville CT (87), Old Mystic CT (88), Ashaway RI-CT (89), Peach Lake NY-CT (90), Bethel CT (91), Botsford CT (92), Long Hill CT (93), Ansonia CT (94), New Haven CT (95), Branford CT (96), Guilford CT (97), Clinton CT (98), Essex CT (99), Old Lyme CT (100), Niantic CT (101), New London CT-NY (102), Mystic CT-NY-RI (103), Watch Hill RI-CT (104), Mount Kisco NY-CT (105), Pound Ridge NY-CT (106), Norwalk North CT-NY (107), Westport CT (108), Bridgeport CT (109), Milford CT (110), Woodmont CT (111), Glenville CT-NY (112), Stamford CT (113), Norwalk South CT (114), Sherwood Point CT-NY (115), Mamaroneck NY-CT (116), Unpublished Quad (1213), Unpublished Quad (1214), Unpublished Quad (1215), Unpublished Quad (1216), Orient NY (1217), Plum Island NY (1218), Unpublished Quad (1310), Unpublished Quad (1311), Unpublished Quad (1312), Unpublished Quad (1313), Bayville NY (1407), and Lloyd Harbor NY (1408).

The USGS does not publish 7.5 minute topographic quadrangle maps for quad numbers 1213, 1214, 1215, 1216, 1310, 1311, 1312, and 1313. These quadrangles are either located in the middle of Long Island Sound (and are entirely coved by water) or include small land areas along the coast shown on the southern margins of the Branford CT (96), Guilford CT (97), Clinton CT (98) topographic quadrangle maps. The Branford, Guilford, and Clinton topographic maps include areas along the Connecticut shoreline slightly beyond their southern quadrangle boundary, which is defined as 41 degrees and 15 minutes of latitude. The additionally mapped areas on these 3 quadrangle maps include locations such as the Thimble Islands, Sachems Head, and Hammonnasset Point. These areas are actually located on unpublished quadrangles  located to the south of the Branford, Guilford, and Clinton quadrangles - numbers 1213, 1214, and 1215. Unpublished quadrangle 1214 also covers Faulkners Island, which is in Long Island Sound off Guilford, Connecticut.

The Orient NY (1217), Plum Island NY (1218), Bayville NY (1407), and Lloyd Harbor NY (1408) quadrangles include portions of Connecticut waters along the Connecticut-New York state boundary in Long Island Sound in addition to sections of Long Island, New York. These quadrangle maps do not contain any Connecticut landmass.
Language of dataset: en
Point Of Contact
Contact information for the individual or organization that is knowledgeable about the data.
Organization: State of Connecticut, Department of Environmental Protection
Person: Howie Sternberg
Phone: 860-424-3540
Fax: 860-424-4058
Email: dep.gisdata@ct.gov
Hours of service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106-5127
Country: USA
Data Type
How the data are represented, formatted and maintained by the data producing organization.
File or table name: depgis.DEP.QUAD_INDEX_NAD83_AREA_ENVELOPE
Data type: vector digital data
Data format: SDE Feature Class
Native dataset environment: These data are maintained by the State of Connecticut using ArcGIS software developed by Environmental Systems Research Institute (ESRI) in a Microsoft Windows operating system environment.
Time Period of Data
Time period(s) for which the data corresponds to the currentness reference.
Date: 1999
Currentness reference:
publication date
Status
The state of and maintenance information for the data.
Data status: Complete
Update frequency: None planned
Key Words
Words or phrases that summarize certain aspects of the data.
Theme:
Keywords: 7.5 minute, quadrangle map, index, USGS, gird
Keyword thesaurus: None
Theme:
Keywords: boundaries, location
Keyword thesaurus: ISO 19115 Topic Category
Place:
Keywords: Connecticut, CT
Keyword thesaurus: U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the Outlying Areas of The United States, and Associated Areas (Federal Information Processing Standard 5-2): Washington, DC, National Institute of Standards and Technology.
Place:
Keywords: United States of America, USA
Keyword thesaurus: U.S. Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions (Federal Information Processing Standard (FIPS) 10-4): Washington, D.C., National Institute of Standards and Technology.
Data Access Constraints
Restrictions and legal prerequisites for accessing or using the data after access is granted.
Access constraints:
None. The data is in the public domain and may be redistributed.
Use constraints:
No restrictions or legal prerequisites for using the data. The data is suitable for use at appropriate scale, and is not intended for maps printed at scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet). Although this data set  has been used by the State of Connecticut, Department of Environmental Protection, no warranty, expressed or implied, is made by the State of Connecticut, Department of Environmental Protection as to the accuracy of the data and or related materials.  The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut, Department of Environmental Protection in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata. When printing this data on a map or using it in a software application, analysis, or report, please acknowledge the State of Connecticut, Department of Environmental Protection as the source for this information. For example, include the following data source description when printing this layer on a map: Quadrangle Boundary - From the USGS 7.5 Minute Quadrangle Index Envelope (NAD83 Area) layer, published by the CT DEP. Source map scale is 1:24,000.
+ Graphic Example
Browse Graphic
Graphic illustration of the data.
Browse graphic 1
Open - Full view of Connecticut USGS 7.5 Minute Quadrangle Index Envelope (NAD83 Area)
Graphic Image
+ Spatial Reference Information
Horizontal Coordinate System
Reference system from which linear or angular quantities are measured and assigned to the position that a point occupies.
Projected coordinate system:
Name: NAD 1983 StatePlane Connecticut FIPS 0600 Feet
Map units: survey feet
Geographic coordinate system:
Name: GCS North American 1983
Coordinate System Details
Map projection
Map projection name: Lambert Conformal Conic
Standard parallel: 41.200000
Standard parallel: 41.866667
Longitude of central meridian: -72.750000
Latitude of projection origin: 40.833333
False easting: 999999.999996
False northing: 499999.999998
Planar Coordinate Information
Planar coordinate encoding method: coordinate pair
Coordinate representation:
Abscissa resolution: 0.000000
Ordinate resolution: 0.000000
Planar distance units: survey feet
Geodetic model
Horizontal datum name: North American Datum of 1983
Ellipsoid name: Geodetic Reference System 80
Semi-major axis: 6378137.000000
Denominator of flattening ratio: 298.257222
Vertical Coordinate System
Reference system from which vertical distances (altitudes or depths) are measured.
Altitude system definition:
Altitude resolution: 1.000000
Altitude encoding method: Explicit elevation coordinate included with horizontal coordinates
Spatial Domain
The geographic areal domain of the data that describes the western, eastern, northern, and southern geographic limits of data coverage.
Bounding Coordinates
In Projected or local coordinates
NAD 1983 StatePlane Connecticut FIPS 0600 Feet
BoundaryCoordinate
Left723438.312520 (survey feet)
Right1311129.999980 (survey feet)
Top1018197.624731 (survey feet)
Bottom515181.656519 (survey feet)
In Unprojected coordinates (geographic)
GCS North American 1983
BoundaryCoordinate
West-73.771430 (longitude)
East-71.600912 (longitude)
North42.255441 (latitude)
South40.869442 (latitude)
+ Data Structure and Attribute Information
Overview
Summary of the information content of the data, including other references to complete descriptions of entity types, attributes, and attribute values for the data.
Entity and attribute overview:
Use the QUAD_NO attribute to uniquely identify features.
Direct spatial reference method: Vector
Indirect spatial reference method: State of Connecticut, United States of America
Attributes of Connecticut USGS 7.5 Minute Quadrangle Index Envelope (NAD83 Area)
Detailed descriptions of entity type, attributes, and attribute values for the data.
Name: depgis.DEP.QUAD_INDEX_NAD83_AREA_ENVELOPE
Type of object: Feature Class
Geometry type: Polygon
Number of records: 187
Description:
USGS 7.5 Minute Topographic Quadrangle areas represented as polygon features.
Source:
State of Connecticut, Department of Environmental Protection
Attributes
OBJECTID
Definition:
Internal feature number.
Alias: OBJECTID Type: OID Width: 4 Precision: 10 Scale: 0
Attribute values: Sequential unique whole numbers that are automatically generated.
Attribute definition source:
ESRI
QGNO
Definition:
Quadrangle ID - Quadrangle Identifier. The GGNO attribute uniquely identifies 7.5 minute quadrangle areas in and nearby Connecticut.
Alias: QGNO Type: SmallInteger Width: 2 Precision: 5 Scale: 0
Attribute values: Numeric value.
Attribute definition source:
Unknown
QUAD_NO
Definition:
Quadrangle Number - An ID number designated by the State of Connecticut, Department of Environmental Protection, Natural Resources Center in the 1980's to uniquely identify individual quadrangle maps.
Alias: QUAD_NO Type: SmallInteger Width: 2 Precision: 5 Scale: 0Output width: 4
Attribute values: Numeric value. Quadrangle maps published by the USGS that cover the Connecticut mainland and coastal area are assigned numeric values ranging from 1-116. Other quadrangle areas that encompass the waters of Connecticut in Long Island Sound are assigned numeric values range from 1213 to 1218, 1310 to 1313, and 1407 to 1408.
Attribute definition source:
State of Connecticut, Department of Environmental Protection
QUADRANGLE
Definition:
Quadrangle Name - Name of the quadrangle map published by the USGS
Alias: QUADRANGLE Type: String Width: 25 Precision: 0 Scale: 0Output width: 25
Attribute values: Text value
Attribute definition source:
US Geological Survey
SHAPE
Definition:
Feature geometry.
Alias: Shape Type: Geometry Width: 4 Precision: 0 Scale: 0
Attribute values: Coordinates defining the features.
Attribute definition source:
ESRI
SHAPE.area
Alias: SHAPE.area Type: Double Width: 0 Precision: 0 Scale: 0
SHAPE.len
Alias: SHAPE.len Type: Double Width: 0 Precision: 0 Scale: 0
ESRI Feature Description
Description of spatial objects in the data using the Environmental Systems Research Institute (ESRI) terminology.
Environmental Systems Research Institute (ESRI) terms
depgis.DEP.QUAD_INDEX_NAD83_AREA_ENVELOPE
ESRI feature type: Simple
Geometry type: Polygon
Topology: FALSE
Feature count: 187
Spatial index: TRUE
Linear referencing: FALSE
SDTS Feature Description
Description of point and vector spatial objects in the data using the Spatial Data Transfer Standards (SDTS) terminology.
Spatial data transfer standard (SDTS) terms
depgis.DEP.QUAD_INDEX_NAD83_AREA_ENVELOPE
Type: G-polygon
Count: 187
+ Data Quality and Accuracy Information
General
Information about the fidelity of relationships, data quality and accuracy tests, omissions, selection criteria, generalization, and definitions used to derive the data.
Logical consistency report:
Polygon features conform to the following topological rules. Polygons are single part. There are no duplicate polygons. Polygons do not self overlap. Polygons do not overlap other polygons. The tests of logical consistency were performed by the State of Connecticut using ESRI ArcInfo software to maintain feature topology in ArcInfo coverage format. The data is topologically clean. The ArcInfo Clean function was repeatedly used following edits to verify topology and enforce a minimum distance between vertices of 4 feet (fuzzy tolerance) and a minimum allowed overshoot length of 0 (zero) feet (dangle length).
Completeness report:
The degree of completeness is based on the extent to which the data covers the geographic area of the State of Connecticut. The layer is complete because it includes quadrangle index polygon features for all of Connecticut, including areas defined by 7.5 minutes of latitude and longitude where the USGS published 1:24,000-scale topographic quadrangle maps and areas of 7.5 minutes of latitude and longitude entirely covered by water (in Long Island Sound) where the USGS did not publish 7.5 minute topographic quadrangle maps.
Attribute Accuracy
Accuracy of the identification of data entities, features and assignment of attribute values.
Attribute accuracy report:
The USGS 7.5 Minute Topographic Quadrangle Index layer depicts the quadrangle boundary feature type shown on the 7.5 minute USGS topographic quadrangle maps as polygon features with boundaries originally based on a NAD83 horizontal datum rather than NAD27 used by the USGS to publish the topographic quadrangle maps. All attributes have valid values. Values are within defined domains. The accuracy test for the QUAD_NO attribute values was conducted by manually entering and visually inspecting and verifying the values. The QUADRANGLE attribute is the English language equivalent of (decodes) the QUAD_NO field values and was populated by joining the feature attribute data table to a lookup data table with QUAD_NO used as the relate key field. This lookup data table contain records with information that account for the unique occurrences of QUAD_NO. The origin and purpose of another quadrangle identifer attribute, QGNO, was unknown at the time this metadata was written.
Positional Accuracy
Accuracy of the positional aspects of the data.
Horizontal accuracy report:
The horizontal positional accuracy of this data complies with the United States National Map Accuracy Standards for 1:24,000 scale maps. According to this standard, not more than 10 percent of the locations tested are to be in error by more than 1/50 inch (40 feet) measured on the publication scale of a USGS 7.5 minute topographic quadrangle map.
+ Data Source and Process Information
Data Sources
Information about the source data used to construct or derive the data.
Data source information
Source 1 - tics.txt
Title: Polygon corner tic coordinates
Originators: State of Connecticut, Department of Environmental Protection
Publisher: State of Connecticut
Publication place: Hartford, Connecticut
Publication date: 1999
Data type: tabular digital data
Map scale denominator: not applicable
Media: disc
Source contribution:
Coordinates defining corners of 7.5 minute quadangle maps used to generate Tic registration features (Tic ID, Longitude, Latitude). Example values for one row of quadrangles:
806,-73.75000,41.75000
807,-73.62500,41.75000
808,-73.50000,41.75000
809,-73.37500,41.75000
810,-73.25000,41.75000
811,-73.12500,41.75000
812,-73.00000,41.75000
813,-72.87500,41.75000
814,-72.75000,41.75000
815,-72.62500,41.75000
816,-72.50000,41.75000
817,-72.37500,41.75000
818,-72.25000,41.75000
819,-72.12500,41.75000
820,-72.00000,41.75000
821,-71.87500,41.75000
822,-71.75000,41.75000
823,-71.62500,41.75000
906,-73.75000,41.62500
907,-73.62500,41.62500
908,-73.50000,41.62500
909,-73.37500,41.62500
910,-73.25000,41.62500
911,-73.12500,41.62500
912,-73.00000,41.62500
913,-72.87500,41.62500
914,-72.75000,41.62500
915,-72.62500,41.62500
916,-72.50000,41.62500
917,-72.37500,41.62500
918,-72.25000,41.62500
919,-72.12500,41.62500
920,-72.00000,41.62500
921,-71.87500,41.62500
922,-71.75000,41.62500
923,-71.62500,41.62500
Date: 1999
Currentness reference:
publication date
Source 2 - labels.txt
Title: Polygon label point coordinates
Originators: State of Connecticut, Department of Environmental Protection
Publisher: State of Connecticut
Publication place: Hartford, Connecticut
Publication date: 1999
Map scale denominator: not applicable
Media: disc
Source contribution:
Coordinates used to generate quadrangle polygon label points (Tic ID, Longitude, Latitude). Example values for one row of quadrangles:
806,-73.68750,41.68750
807,-73.56250,41.68750
808,-73.43750,41.68750
809,-73.31250,41.68750
810,-73.18750,41.68750
811,-73.06250,41.68750
812,-72.93750,41.68750
813,-72.81250,41.68750
814,-72.68750,41.68750
815,-72.56250,41.68750
816,-72.43750,41.68750
817,-72.31250,41.68750
818,-72.18750,41.68750
819,-72.06250,41.68750
820,-71.93750,41.68750
821,-71.81250,41.68750
822,-71.68750,41.68750
Date: 1999
Currentness reference:
publication date
Source 3 - quaddata.txt
Title: Polygon attribute data
Originators: State of Connecticut, Department of Environmental Protection
Publisher: State of Connecticut
Publication place: Hartford, Connecticut
Publication date: 1999
Map scale denominator: not applicable
Media: disc
Source contribution:
Source of data for lookup data table joined to polygon features. Example values for one row of quadrangles:
"Qgno","Quad_no","Quadrangle","Cttopo_flg","Ctquad_flg"
806,806,Verbank NY,F,F
807,45,Dover Plains,T,T
808,46,Kent,T,T
809,47,New Preston,T,T
810,48,Litchfield,T,T
811,49,Thomaston,T,T
812,50,Bristol,T,T
813,51,New Britain,T,T
814,52,Hartford South,T,T
815,53,Glastonbury,T,T
816,54,Marlborough,T,T
817,55,Columbia,T,T
818,56,Willimantic,T,T
819,57,Scotland,T,T
820,58,Plainfield,T,T
821,59,Oneco,T,T
822,822,Coventry Center RI,T,F
Date: 1999
Currentness reference:
publication date
Source 4 - Quad_Index
Title: Connecticut USGS 7.5 Minute Quadrangle Index Envelope (NAD83 Area)
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor, and publisher)
Publisher: State of Connecticut
Publication place: Hartford, Connecticut
Publication date: 1999
Edition: 2005
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Index is in ArcInfo coverage format with polygon and tic features.
Date: 1999
Currentness reference:
publication date
Source 5 - Quad_Index_NAD83_Area_Envelope.shp
Title: Connecticut USGS 7.5 Minute Quadrangle Index (NAD 83 Area)
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor, and publisher)
Publisher: State of Connecticut
Publication place: Hartford, Connecticut
Publication date: 1999
Edition: 2005
Data type: vector digital data
Data location: http://www.ct.gov/deep
Other citation details:
The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. The 2005 Edition includes that same spatial data originally published in 1999 with the addition of metadata.
Map scale denominator: 24000
Media: disc
Source contribution:
Quad_Index_NAD83_Area.shp is in ESRI Shapefile format with polygon features.
Date: 1999
Currentness reference:
publication date
Source 6 - Quad_Index_NAD83_Area_Envelope
Title: Connecticut USGS 7.5 Minute Quadrangle Index (NAD 83 Area)
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor, and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1999
Edition: 2005
Data type: vector digital data
Data location: http://www.ct.gov/deep
Other citation details:
The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. The 2005 Edition includes that same spatial data originally published in 1999 with the addition of metadata.
Map scale denominator: 24000
Media: disc
Source contribution:
Quad_Index_NAD83_Area is in  GeoDatabase Feature Class format.
Date: 1999
Currentness reference:
publication date
Process Steps
Information about events, parameters, tolerances and techniques applied to construct or derive the data.
Process step information
Process Step 1
Process description:
Create 2005 Edition of Quadrangle Index - The automated process for creating the USGS 7.5 Minute Quadrangle Index (NAD83) is documented in an Arc Macro Language (AML) script named MAKEINDEX.AML for the USGS quadrangle map category of data for the State of Connecticut, Department of Environmental Protection. The MAKEINDEX.AML creates polygon features and assigns attribute information to these features based on information in three text files that specify and define polygon corner coordinates, polygon label point coordinates, and polygon attribute values. There are a number of steps in this process. To begin, two intermediate ArcInfo coveages were generated. An ArcInfo coverage named INDEXDD was generated that stored (preliminary quadrangle boundary) line features based on a fishnet-type grid orientation  with an origin of -73.45,40.875 (SW corner of quad 116), an upper left coordinate of -73.75,42.25 (NW corner of quad 406), an upper right coordinate of -71.625,42.25 (NE corner of quad 422), and a cell size of 0.125,0.125 (7.5 minutes). These features represented lines of latitude and longitude spaced at 7.5-minute intervals. Tic features were also generated and added to this coverage base on coordinate values from Source 1 (tics.txt). Five vertices were added to each quadrangle boundary line feature at an interval of 0.021 minutes (0.125 / 6 = 0.021). Note, five vertices require 6 segments. These vertices were programmatically added to ensure that line features would accurately project from Geographic coordinates (latitude and longitude) by allowing them to curve at vertex locations as opposed to simply projecting a straight line between quadrangle corners. Note, quadrangle boundaries are not straight lines. A second ArcInfo coverage named LABELPOINTDD was generated based on values from Source 2 (labels.txt). These point features were purposefully located in the center of each quadrangle polygon feature. The INDEXDD and LABELPOINTDD coverages were projected to Connecticut State Plane, NAD83 and named INDEX1 and LABELPOINT, respectively. ArcInfo coverage Fuzzy and Dangle tolerance settings for INDEX1 were set to 4 and 10 feet, respectively. Based on the line feature geometry, polygon features were built and added to INDEX1. Additionally, point features from LABELPOINT were added to INDEX1 and used to attribute each polygon feature with the corresponding quadrangle number. An INFO data table based on Source 3 (quadata.txt) was subsequently appended to these polygon features to include additional information such as quadrangle map name. Finally, the USGS 7.5 Minute Quadrangle Index (NAD83) coverage was derived from a query-based selection of polygon features from INDEX1 by using an attribute value from Source 3 (CTQUAD_FLG = "T") that flagged the quadrangle polygon features necessary to cover the geographic area of the State of Connecticut. The name of the resulting ArcInfo Coverage is INDEX.
Organization: State of Connecticut, Department of Environmental Protection
Person: Howie Sternberg
Process date: 2005
Process software and version: Workstation ArcInfo 8.3
Data Source used
Source 1 - tics.txt
Title: Polygon corner tic coordinates
Originators: State of Connecticut, Department of Environmental Protection
Publisher: State of Connecticut
Publication place: Hartford, Connecticut
Publication date: 1999
Data type: tabular digital data
Map scale denominator: not applicable
Media: disc
Source contribution:
Coordinates defining corners of 7.5 minute quadangle maps used to generate Tic registration features (Tic ID, Longitude, Latitude). Example values for one row of quadrangles:
806,-73.75000,41.75000
807,-73.62500,41.75000
808,-73.50000,41.75000
809,-73.37500,41.75000
810,-73.25000,41.75000
811,-73.12500,41.75000
812,-73.00000,41.75000
813,-72.87500,41.75000
814,-72.75000,41.75000
815,-72.62500,41.75000
816,-72.50000,41.75000
817,-72.37500,41.75000
818,-72.25000,41.75000
819,-72.12500,41.75000
820,-72.00000,41.75000
821,-71.87500,41.75000
822,-71.75000,41.75000
823,-71.62500,41.75000
906,-73.75000,41.62500
907,-73.62500,41.62500
908,-73.50000,41.62500
909,-73.37500,41.62500
910,-73.25000,41.62500
911,-73.12500,41.62500
912,-73.00000,41.62500
913,-72.87500,41.62500
914,-72.75000,41.62500
915,-72.62500,41.62500
916,-72.50000,41.62500
917,-72.37500,41.62500
918,-72.25000,41.62500
919,-72.12500,41.62500
920,-72.00000,41.62500
921,-71.87500,41.62500
922,-71.75000,41.62500
923,-71.62500,41.62500
Date: 1999
Currentness reference:
publication date
Source 2 - labels.txt
Title: Polygon label point coordinates
Originators: State of Connecticut, Department of Environmental Protection
Publisher: State of Connecticut
Publication place: Hartford, Connecticut
Publication date: 1999
Map scale denominator: not applicable
Media: disc
Source contribution:
Coordinates used to generate quadrangle polygon label points (Tic ID, Longitude, Latitude). Example values for one row of quadrangles:
806,-73.68750,41.68750
807,-73.56250,41.68750
808,-73.43750,41.68750
809,-73.31250,41.68750
810,-73.18750,41.68750
811,-73.06250,41.68750
812,-72.93750,41.68750
813,-72.81250,41.68750
814,-72.68750,41.68750
815,-72.56250,41.68750
816,-72.43750,41.68750
817,-72.31250,41.68750
818,-72.18750,41.68750
819,-72.06250,41.68750
820,-71.93750,41.68750
821,-71.81250,41.68750
822,-71.68750,41.68750
Date: 1999
Currentness reference:
publication date
Source 3 - quaddata.txt
Title: Polygon attribute data
Originators: State of Connecticut, Department of Environmental Protection
Publisher: State of Connecticut
Publication place: Hartford, Connecticut
Publication date: 1999
Map scale denominator: not applicable
Media: disc
Source contribution:
Source of data for lookup data table joined to polygon features. Example values for one row of quadrangles:
"Qgno","Quad_no","Quadrangle","Cttopo_flg","Ctquad_flg"
806,806,Verbank NY,F,F
807,45,Dover Plains,T,T
808,46,Kent,T,T
809,47,New Preston,T,T
810,48,Litchfield,T,T
811,49,Thomaston,T,T
812,50,Bristol,T,T
813,51,New Britain,T,T
814,52,Hartford South,T,T
815,53,Glastonbury,T,T
816,54,Marlborough,T,T
817,55,Columbia,T,T
818,56,Willimantic,T,T
819,57,Scotland,T,T
820,58,Plainfield,T,T
821,59,Oneco,T,T
822,822,Coventry Center RI,T,F
Date: 1999
Currentness reference:
publication date
Data Source produced
Source 4 - Quad_Index
Title: Connecticut USGS 7.5 Minute Quadrangle Index Envelope (NAD83 Area)
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor, and publisher)
Publisher: State of Connecticut
Publication place: Hartford, Connecticut
Publication date: 1999
Edition: 2005
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Index is in ArcInfo coverage format with polygon and tic features.
Date: 1999
Currentness reference:
publication date
Process Step 2
Process description:
Export to Shapefile Format - Converted polygon feature data from ArcInfo Coverage named INDEX to a Shapefile named Quad_Index_NAD83_Area_Envelope.shp. Excluded the AREA, PERIMETER, INDEX#, and INDEX-ID attributes from the Shapefile because their values are only maintained by ArcInfo software with data that is in ArcInfo Coverage format. Includes all polygon features within (fishnet) envelope area covering Connecticut.
Organization: State of Connecticut, Department of Environmental Protection
Person: Howie Sternberg
Process date: 2005
Process software and version: ArcGIS 9.1
Data Source used
Source 4 - Quad_Index
Title: Connecticut USGS 7.5 Minute Quadrangle Index Envelope (NAD83 Area)
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor, and publisher)
Publisher: State of Connecticut
Publication place: Hartford, Connecticut
Publication date: 1999
Edition: 2005
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Index is in ArcInfo coverage format with polygon and tic features.
Date: 1999
Currentness reference:
publication date
Data Source produced
Source 5 - Quad_Index_NAD83_Area_Envelope.shp
Title: Connecticut USGS 7.5 Minute Quadrangle Index (NAD 83 Area)
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor, and publisher)
Publisher: State of Connecticut
Publication place: Hartford, Connecticut
Publication date: 1999
Edition: 2005
Data type: vector digital data
Data location: http://www.ct.gov/deep
Other citation details:
The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. The 2005 Edition includes that same spatial data originally published in 1999 with the addition of metadata.
Map scale denominator: 24000
Media: disc
Source contribution:
Quad_Index_NAD83_Area.shp is in ESRI Shapefile format with polygon features.
Date: 1999
Currentness reference:
publication date
Process Step 3
Process description:
Convert to GeoDatabase Feature Class format - Defined new Feature Class named Quad_Index_NAD83_Area_Envelope; and imported the attribute definitions, loaded features and imported metadata from  Quad_Index_NAD83_Area_Envelope.shp shapefile.
 
Spatial Reference Properties for Feature Class:
Coordinate System: NAD_1983_StatePlane_Connecticut_FIPS_0600_Feet
XY Domain MinX: 100000; MaxX: 2247483.645
XY Domain MinY: 200000; MaxY: 2347483.645
Precision: 1000
Organization: State of Connecticut, Department of Environmental Protection (data compiler, editor, and publisher)
Person: Howie Sternberg
Phone: 860-424-3540
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Process date: 20060101
Process software and version: ArcGIS 9.1
Data Source used
Source 5 - Quad_Index_NAD83_Area_Envelope.shp
Title: Connecticut USGS 7.5 Minute Quadrangle Index (NAD 83 Area)
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor, and publisher)
Publisher: State of Connecticut
Publication place: Hartford, Connecticut
Publication date: 1999
Edition: 2005
Data type: vector digital data
Data location: http://www.ct.gov/deep
Other citation details:
The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. The 2005 Edition includes that same spatial data originally published in 1999 with the addition of metadata.
Map scale denominator: 24000
Media: disc
Source contribution:
Quad_Index_NAD83_Area.shp is in ESRI Shapefile format with polygon features.
Date: 1999
Currentness reference:
publication date
Data Source produced
Source 6 - Quad_Index_NAD83_Area_Envelope
Title: Connecticut USGS 7.5 Minute Quadrangle Index (NAD 83 Area)
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor, and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1999
Edition: 2005
Data type: vector digital data
Data location: http://www.ct.gov/deep
Other citation details:
The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. The 2005 Edition includes that same spatial data originally published in 1999 with the addition of metadata.
Map scale denominator: 24000
Media: disc
Source contribution:
Quad_Index_NAD83_Area is in  GeoDatabase Feature Class format.
Date: 1999
Currentness reference:
publication date
ESRI geoprocessing history
Description of ESRI geoprocessing commands, settings, and tolerances applied to the data.
ESRI geoprocessing command information
1 Create Feature Class
Date: 20071102 Time: 113938
Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\CreateFeatureclass
Command issued: CreateFeatureclass "Database Connections\10.18.8.94.depgis@DEP_Direct.sde" Quad_Index_NAD83_Area_Envelope # Quad_Index_NAD83_Area_Envelo SAME_AS_TEMPLATE SAME_AS_TEMPLATE "{B286C06B-0879-11D2-AACA-00C04FA33C20};-82227.472038 -332821.987663 976.562499090505;0 100000;0 100000" DEPVECTORDYNAMIC 1000 0 0 "Database Connections\10.18.8.94.depgis@DEP_Direct.sde\depgis.DEP.Quad_Index_NAD83_Area_Envelope"
2 Append
Date: 20071102 Time: 113940
Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\Append
Command issued: Append Quad_Index_NAD83_Area_Envelo "Database Connections\10.18.8.94.depgis@DEP_Direct.sde\depgis.DEP.Quad_Index_NAD83_Area_Envelope" TEST "Database Connections\10.18.8.94.depgis@DEP_Direct.sde\depgis.DEP.Quad_Index_NAD83_Area_Envelope"
3 FeatureClassToFeatureClass_2
Date: 20071102 Time: 113941
Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Conversion Tools.tbx\FeatureClassToFeatureClass
Command issued: FeatureClassToFeatureClass R:\Archive\tile_index\geodatabase\Tile_Index.mdb\Quad_Index_NAD83_Area_Envelope "Database Connections\10.18.8.94.depgis@DEP_Direct.sde" Quad_Index_NAD83_Area_Envelope # "QGNO QGNO VISIBLE;QUAD_NO QUAD_NO VISIBLE;QUADRANGLE QUADRANGLE VISIBLE;Shape_Length Shape_Length VISIBLE;Shape_Area Shape_Area VISIBLE" SAME_AS_TEMPLATE SAME_AS_TEMPLATE DEPVECTORDYNAMIC 1000 "Database Connections\10.18.8.94.depgis@DEP_Direct.sde\depgis.DEP.Quad_Index_NAD83_Area_Envelope"
4 CopyFeatures_39
Date: 20081212 Time: 153049
Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\CopyFeatures
Command issued: CopyFeatures "Database Connections\10.18.8.94.depgis@DEP.sde\depgis.DEP.QUAD_INDEX_NAD83_AREA_ENVELOPE" "Database Connections\062174-svr.depgis@DEP.sde\depgis.DEP.QUAD_INDEX_NAD83_AREA_ENVELOPE" DEPFEATUREDYNAMIC 0 0 0
5 Process
Date: 20090727 Time: 082638
Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\CopyFeatures
Command issued: CopyFeatures "Database Connections\10.18.8.60.depgis@DEP_dc.sde\depgis.DEP.QUAD_INDEX_NAD83_AREA_ENVELOPE" Y:\GIS_Warehouse\public_data\Geodatabase_format\Location\Map_Index.gdb\QUAD_INDEX_NAD83_AREA_ENVELOPE # 0 0 0
+ Data Distribution Information
General
Description of the data known by the party from whom the data may be obtained, liability of party distributing data, and technical capabilities required to use the data.
Resource description:
Connecticut USGS 7.5 Minute Quadrangle Index Envelope (NAD83 Area)
Technical prerequisites:
Geographic information sytem (GIS), computer-aided drawing or other mapping software is necessary to display, view and access the information.
Distribution Point of Contact
Contact information for the individual or organization distributing the data.
Organization: State of Connecticut, Department of Enviromental Protection
Phone: 860-424-3540
Fax: 860-424-4058
Email: dep.gisdata@ct.gov
Hours of service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106-5127
Country: USA
Standard Order Process
Common ways in which data may be obtained.
Digital form:
Format name: Shapefile, Feature Class
Format version number: ArcGIS
File decompression technique: Zip file
Digital transfer option:
Online option:
Computer information:
Network address:
Network resource name: http://www.ct.gov/deep
Fees: An online copy of the data may be accessed without charge.
Custom Order Process
Description of custom distribution services available.
Custom order process:
The data distributor does not provide custom GIS analysis or mapping services. Data is available in a standard format and may be converted to other formats, projections, coordinate systems, or selected for specific geographic regions by the party receiving the data.
+ Metadata Reference
Metadata Date
Dates associated with creating, updating and reviewing the metadata.
Last updated: 20111208
Language of metadata: en
Metadata Point of Contact
Contact information for the individual or organization responsible for the metadata information.
Organization: State of Connecticut, Department of Environmental Protection
Person: Howie Sternberg
Phone: 860-424-3540
Fax: 860-424-4058
Email: dep.gisdata@ct.gov
Hours of service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106-5127
Country: USA
Metadata Standards
Description of the metadata standard used to document the data and reference to any additional extended profiles to the standard used by the metadata producer.
Standard name: FGDC Content Standards for Digital Geospatial Metadata
Standard version: FGDC-STD-001-1998
Time convention: local time
Metadata profiles defining additonal information:
Profile: ESRI Metadata Profile
FGDC Plus Metadata Stylesheet
Stylesheet: FGDC Plus Stylesheet
File name: FGDC Plus.xsl
Version: 2.2
Description: This metadata is displayed using the FGDC Plus Stylesheet, which is an XSL template that can be used with ArcGIS software to display metadata. It displays metadata elements defined in the Content Standard for Digital Geospatial Metadata (CSDGM) - aka FGDC Standard, the ESRI Profile of CSDGM, the Biological Data Profile of CSDGM, and the Shoreline Data Profile of CSDGM. CSDGM is the US Federal Metadata standard. The Federal Geographic Data Committee originally adopted the CSDGM in 1994 and revised it in 1998. According to Executive Order 12096 all Federal agencies are ordered to use this standard to document geospatial data created as of January, 1995. The standard is often referred to as the FGDC Metadata Standard and has been implemented beyond the federal level with State and local governments adopting the metadata standard as well. The Biological Data Profile broadens the application of the CSDGM so that it is more easily applied to biological data that are not explicitly geographic (laboratory results, field notes, specimen collections, research reports) but can be associated with a geographic location. Includes taxonomical vocabulary. The Shoreline Data Profile addresses variability in the definition and mapping of shorelines by providing a standardized set of terms and data elements required to support metadata for shoreline and coastal data sets. The FGDC Plus Stylesheet includes the Dublin Core Metadata Element Set. It supports W3C DOM compatible browsers such as IE7, IE6, Netscape 7, and Mozilla Firefox. It is in the public domain and may be freely used, modified, and redistributed. It is provided "AS-IS" without warranty or technical support.
Instructions: On the top of the page, click on the title of the dataset to toggle opening and closing of all metadata content sections or click section links listed horizontally below the title to open individual sections. Click on a section name (e.g. Description) to open and close section content. Within a section, click on a item name (Status, Key Words, etc.) to open and close individual content items. By default, the Citation information within the Description section is always open for display.
Download: FGDC Plus Stylesheet is available from the ArcScripts downloads at www.esri.com.