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Connecticut USGS 7.5 Minute Quadrangle Index (NAD83 Area)

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publication_Date: 1999
Title:
Connecticut USGS 7.5 Minute Quadrangle Index (NAD83 Area)
Edition: 2005
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Hartford, Connecticut, USA
Publisher: State of Connecticut, Department of Environmental Protection
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.
Online_Linkage: http://www.ct.gov/deep
Description:
Abstract:
This is a special index of the 1:24,000-scale U.S. Geological Survey (USGS) 7.5-minute topographic quadrangle maps that cover the State of Connecticut. The index includes a polygon feature for each 7.5-minute quadrangle area. However, the boundaries of the polygon features in this layer DO NOT correspond exactly with the quadrangle boundaries published on the USGS 7.5-minute topographic quadrangle maps because the polygon feature boundaries are based on the Connecticut State Plane Coordinate System, North American Datum of 1983 (NAD83) and the boundaries on the quadrangle maps are based on the Connecticut State Plane Coordinate System, North American Datum of 1927 (NAD27). However, the boundaries of the polygon features in this layer DO line up with 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. 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. Note, 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 7.5-minute quadrangle areas based on the Connecticut State Plane Coordinate System, North American Datum of 1983 (NAD83) rather than the Connecticut State Plane Coordinate System, North American Datum of 1927 (NAD27). 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.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: not applicable
Currentness_Reference:
publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -73.769427
East_Bounding_Coordinate: -71.736400
North_Bounding_Coordinate: 42.129308
South_Bounding_Coordinate: 40.872324
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: 7.5 minute
Theme_Keyword: quadrangle map
Theme_Keyword: index
Theme_Keyword: USGS
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: boundaries
Theme_Keyword: location
Place:
Place_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_Keyword: Connecticut
Place_Keyword: CT
Place:
Place_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.
Place_Keyword: United States of America
Place_Keyword: USA
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 (NAD83 Area) layer, published by the CT DEP. Source map scale is 1:24,000.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Connecticut, Department of Environmental Protection
Contact_Person: Howie Sternberg
Contact_Address:
Address_Type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State_or_Province: Connecticut
Postal_Code: 06106-5127
Country: USA
Contact_Voice_Telephone: 860-424-3540
Contact_Facsimile_Telephone: 860-424-4058
Contact_Electronic_Mail_Address: dep.gisdata@ct.gov
Hours_of_Service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Browse_Graphic:
Browse_Graphic_File_Name: http://www.cteco.uconn.edu/metadata/dep/browsegraphic/quadindexnad83areafullview.gif
Browse_Graphic_File_Description:
Full view of Connecticut USGS 7.5 Minute Quadrangle Index (NAD83 Area)
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: http://www.cteco.uconn.edu/metadata/dep/browsegraphic/quadindexnad83areaquadview.gif
Browse_Graphic_File_Description:
View of Connecticut USGS 7.5 Minute Quadrangle Index (NAD 83 Area) with the Spring Hill, Connecticut Quadrangle (quad 41)
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: http://www.cteco.uconn.edu/metadata/dep/browsegraphic/quadindexnad83areadetailview.gif
Browse_Graphic_File_Description:
Detail view of Connecticut USGS 7.5 Minute Quadrangle Index (NAD 83 Area) boundaries that do not register (e.g. line up) with the corner of a USGS topographic quadrangle map, which was published in NAD27. This index registers to the NAD 83 corner tics on the topographic quadrangle map. These NAD83 tics are offset from the corners of the topo map area that was published in NAD27.
Browse_Graphic_File_Type: GIF
Native_Data_Set_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.
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Data_Quality_Information:
Attribute_Accuracy:
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.
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.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_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.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: State of Connecticut, Department of Environmental Protection
Publication_Date: 1999
Title:
Polygon corner tic coordinates
Geospatial_Data_Presentation_Form: tabular digital data
Publication_Information:
Publication_Place: Hartford, Connecticut
Publisher: State of Connecticut
Source_Scale_Denominator: not applicable
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Source 1 - tics.txt
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
Source_Information:
Source_Citation:
Citation_Information:
Originator: State of Connecticut, Department of Environmental Protection
Publication_Date: 1999
Title:
Polygon label point coordinates
Publication_Information:
Publication_Place: Hartford, Connecticut
Publisher: State of Connecticut
Source_Scale_Denominator: not applicable
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Source 2 - labels.txt
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
Source_Information:
Source_Citation:
Citation_Information:
Originator: State of Connecticut, Department of Environmental Protection
Publication_Date: 1999
Title:
Polygon attribute data
Publication_Information:
Publication_Place: Hartford, Connecticut
Publisher: State of Connecticut
Source_Scale_Denominator: not applicable
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Source 3 - quaddata.txt
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
Source_Information:
Source_Citation:
Citation_Information:
Originator: State of Connecticut, Department of Environmental Protection (data compiler, editor, and publisher)
Publication_Date: 1999
Title:
Connecticut USGS 7.5 Minute Quadrangle Index (NAD 83 Area)
Edition: 2005
Publication_Information:
Publication_Place: Hartford, Connecticut
Publisher: State of Connecticut
Online_Linkage: http://www.ct.gov/deep
Source_Scale_Denominator: 24000
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Source 4 - Index
Source_Contribution:
Index is in ArcInfo coverage format with polygon and tic features.
Source_Information:
Source_Citation:
Citation_Information:
Originator: State of Connecticut, Department of Environmental Protection (data compiler, editor, and publisher)
Publication_Date: 1999
Title:
Connecticut USGS 7.5 Minute Quadrangle Index (NAD 83 Area)
Edition: 2005
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Hartford, Connecticut
Publisher: State of Connecticut
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.
Online_Linkage: http://www.ct.gov/deep
Source_Scale_Denominator: 24000
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Source 5 - Quad_Index_NAD83_Area.shp
Source_Contribution:
Quad_Index_NAD83_Area.shp is in ESRI Shapefile format with polygon features.
Source_Information:
Source_Citation:
Citation_Information:
Originator: State of Connecticut, Department of Environmental Protection (data compiler, editor, and publisher)
Publication_Date: 1999
Title:
Connecticut USGS 7.5 Minute Quadrangle Index (NAD 83 Area)
Edition: 2005
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Hartford, Connecticut, USA
Publisher: State of Connecticut, Department of Environmental Protection
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.
Online_Linkage: http://www.ct.gov/deep
Source_Scale_Denominator: 24000
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Source 6 - Quad_Index_NAD83_Area
Source_Contribution:
Quad_Index_NAD83_Area is in  GeoDatabase Feature Class format.
Process_Step:
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.
Source_Used_Citation_Abbreviation:
Source 1 - tics.txt
Source_Used_Citation_Abbreviation:
Source 2 - labels.txt
Source_Used_Citation_Abbreviation:
Source 3 - quaddata.txt
Process_Date: 2005
Source_Produced_Citation_Abbreviation:
Source 4 - Index
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Connecticut, Department of Environmental Protection
Contact_Person: Howie Sternberg
Process_Step:
Process_Description:
Export to Shapefile Format - Converted polygon feature data from ArcInfo Coverage named INDEX to a Shapefile named Quad_Index_NAD83_Area.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.
Source_Used_Citation_Abbreviation:
Source 4 - Index
Process_Date: 2005
Source_Produced_Citation_Abbreviation:
Source 5 - Quad_Index_NAD83_Area.shp
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Connecticut, Department of Environmental Protection
Contact_Person: Howie Sternberg
Process_Step:
Process_Description:
Convert to GeoDatabase Feature Class format - Defined new Feature Class named Quad_Index_NAD83_Area; and imported the attribute definitions, loaded features and imported metadata from  Quad_Index_NAD83_Area.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
Source_Used_Citation_Abbreviation:
Source 5 - Quad_Index_NAD83_Area.shp
Process_Date: 20060101
Source_Produced_Citation_Abbreviation:
Source 6 - Quad_Index_NAD83_Area
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Connecticut, Department of Environmental Protection (data compiler, editor, and publisher)
Contact_Person: Howie Sternberg
Contact_Address:
Address_Type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State_or_Province: Connecticut
Postal_Code: 06106
Country: USA
Contact_Voice_Telephone: 860-424-3540
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Spatial_Data_Organization_Information:
Indirect_Spatial_Reference_Method:
State of Connecticut, United States of America
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 128
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Lambert Conformal Conic
Lambert_Conformal_Conic:
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: 0.000250
Ordinate_Resolution: 0.000250
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_Definition:
Altitude_System_Definition:
Altitude_Resolution: 1.000000
Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates
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Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Connecticut USGS 7.5 Minute Quadrangle Index (NAD83 Area)
Entity_Type_Definition:
USGS 7.5 Minute Topographic Quadrangle areas represented as polygon features.
Entity_Type_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute:
Attribute_Label: OBJECTID
Attribute_Definition:
Internal feature number.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: QUAD_NO
Attribute_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.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Unrepresentable_Domain:
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:
Attribute_Label: QUADRANGLE
Attribute_Definition:
Quadrangle Name - Name of the quadrangle map published by the USGS
Attribute_Definition_Source:
US Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain:
Text value
Attribute:
Attribute_Label: SHAPE
Attribute_Definition:
Feature geometry.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Coordinates defining the features.
Attribute:
Attribute_Label: SHAPE.area
Attribute:
Attribute_Label: SHAPE.len
Overview_Description:
Entity_and_Attribute_Overview:
Use the QUAD_NO attribute to uniquely identify features.
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Connecticut, Department of Enviromental Protection
Contact_Address:
Address_Type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State_or_Province: Connecticut
Postal_Code: 06106-5127
Country: USA
Contact_Voice_Telephone: 860-424-3540
Contact_Facsimile_Telephone: 860-424-4058
Contact_Electronic_Mail_Address: dep.gisdata@ct.gov
Hours_of_Service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Resource_Description: Connecticut USGS 7.5 Minute Quadrangle Index (NAD83 Area)
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Shapefile, Feature Class
Format_Version_Number: ArcGIS
File_Decompression_Technique: Zip file
Digital_Transfer_Option:
Online_Option:
Computer_Contact_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:
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.
Technical_Prerequisites:
Geographic information sytem (GIS), computer-aided drawing or other mapping software is necessary to display, view and access the information.
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Metadata_Reference_Information:
Metadata_Date: 20111208
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Connecticut, Department of Environmental Protection
Contact_Person: Howie Sternberg
Contact_Address:
Address_Type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State_or_Province: Connecticut
Postal_Code: 06106-5127
Country: USA
Contact_Voice_Telephone: 860-424-3540
Contact_Facsimile_Telephone: 860-424-4058
Contact_Electronic_Mail_Address: dep.gisdata@ct.gov
Hours_of_Service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: http://www.esri.com/metadata/esriprof80.html
Profile_Name: ESRI Metadata Profile
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