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Connecticut 1990 Orthophoto
File Geodatabase Raster Dataset - FGDBR - Ortho_1990
FGDC, ESRI Metadata
DescriptionGraphicSpatialData StructureData QualityData SourceData DistributionMetadata
+ Resource Description
Citation
Information used to reference the data.
Title: Connecticut 1990 Orthophoto
Originators: State of Connecticut, Department of Environmental Protection (data publisher)
U.S. Geological Survey (original data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, 06106
Publication date: 20070402
Data type: Fgdb raster digital data
Data location: http://www.ct.gov/dep
Larger Work Citation
Title: 1990 Digital Orthophoto Quarter Quadrangles (DOQQ)
Originators: State of Connecticut, Department of Environmental Protection (data publisher)
U.S. Geological Survey (original data compiler, editor, and publisher)
Series name: USGS 3.75 Minute Digital Orthophoto Quarter Quadrangle (DOQQ
Series identification: USGS 3.75 Minute Digital Orthophoto Quarter Quadrangles (DOQQs) are othophotos that cover one quarter the area of a USGS 7.5 minute topographic quadrangle map.
Publisher: U.S. Geological Survey
Publication place: Reston, Virgina 22092, USA
Publication date: 1990
Data type: raster digital data
Description
A characterization of the data, including its intended use and limitations.
Abstract:
Connecticut 1990 Orthophoto is a raster mosaic of 1990 orthophotography for Connecticut. It represents a mosaic of 414 digital orthophoto quarter quads (DOQQ) produced by the U.S. Geological Survey (USGS). The date of the orthophotography is 1990. The raster mosaic is based on DOQQs that are gray-scale, leaf-off, 1:12,000 scale (1 inch = 1,000 feet), quarter-quadrangle (3.75 minutes of latitude by 3.75 minutes of longitude) input raster images with 1-meter ground resolution. Input raster DOQQs are in Tagged Image File Format (TIFF) format and named "ortho_1990_quad0078se.tif" after CT DEP quadrangle number 78, SE quadrant, for example. Each 7.5 minute quadrangle is broken into four quadrants: NE, NW, SE, and SW. Each of these 3.75 minute quarter quadrangles is referred to as a quarter quad.
	
Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary orthophoto produced by the USGS is the digital orthophoto quarter quadrangle (DOQQ), a 1-meter ground resolution, quarter-quadrangle (3.75 minutes of latitude by 3.75 minutes of longitude) image cast on the Universal Transverse Mercator projection (UTM) on the North American Datum of 1983 (NAD83). The geographic extent of the DOQQ is equivalent to a quarter-quadrangle plus the overedge ranges from a minimum of 50 meters to a maximum of 300 meters corner points. The overedge is included to facilitate tonal matching for mosaicking and for the placement of the NAD83 and secondary datum corner ticks. The normal orientation of data is by lines (rows) and samples (columns). Each line contains a series of pixels ordered from west to east with the order of the lines from north to south. The radiometric image brightness values are stored as 256 gray levels, ranging from 0 to 255.
Purpose:
DOQs (or DOQQs) serve a variety of purposes, from interim maps to field references for Earth science investigations and analysis. The DOQ is useful as a layer of a geographic information system and as a tool for revision of USGS digital line graphs and topographic maps. A DOQ can be incorporated into any geographic information system (GIS) that can manipulate raster images. It can function as a cartographic base for displaying, generating, and modifying associated digital planimetric data. Other applications include vegetation and timber management, routing and habitat analysis, environmental impact assessments, emergency evacuation planning, flood analysis, soil erosion assessment, facility management, and ground-water and watershed analysis. The accuracy and detail provided by the DOQ allow users to evaluate their data for accuracy and completeness, make real-time modifications to their data, and create new spatial data.
Supplemental information:
The Connecticut Department of Environmental Protection converted the 1990 DOQQs produced by the USGS from UTM (meters) to the Connecticut State Plane Coordinate System North American Datum of 1983 (NAD83). Map units are feet, not meters. These DOQQs are in Tagged Image File Format (TIFF) format and named ortho_1990_quadxxxxYY.tif, where xxxx is a 4 digit quadrangle number beginning at 0001 and YY identifies the quarter quadrange (ne, nw, se, sw). The Connecticut Department of Environmental Protection subsequently created a statewide mosaic of these 1990 DOQQs.

An orthophoto or orthophotograph is an aerial photograph that has been geometrically corrected ("orthorectified") such that the scale of the photograph is uniform, meaning that the photo can be considered equivalent to a map. Unlike an aerial photograph, an orthophotograph can be used to measure true distances, because it is an accurate representation of the earth's surface, having been adjusted for topographic relief, lens distortion, and camera tilt.

For additional specific information on the production of digital orthophoto quadrangles, refer to Standards for Digital Orthophotos (National Mapping Program Technical Instructions) published by the U.S. Department of Interior, U.S. Geological Survey, National Mapping Division.
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@po.state.ct.us
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
County: USA
Data Type
How the data are represented, formatted and maintained by the data producing organization.
File or table name: Ortho_1990
Data type: Fgdb raster digital data
Data format: File Geodatabase Raster Dataset
Native dataset environment: This raster mosaic is 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: 1990
Currentness reference:
ground condition
Status
The state of and maintenance information for the data.
Data status: In work
Update frequency: As needed
Key Words
Words or phrases that summarize certain aspects of the data.
Theme:
Keywords: biota, elevation, imageryBaseMapsEarthCover, inlandWaters, geoscientificInformation, oceans, society
Keyword thesaurus: ISO 19115 Topic Category
Theme:
Keywords: USGS, digital orthophoto quad, 1-Meter DOQ, DOQ, DOQQ, digital orthophoto quadrangle, digital orthophoto quarter quadrangle, orthophoto, orthophotography, orthoimage, orthoimagery, imagery, raster, geo-referenced raster image, aerial photo
Keyword thesaurus: None
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.
Data Access Constraints
Restrictions and legal prerequisites for accessing or using the data after access is granted.
Access constraints:
None. No restrictions or legal prerequisites for accessing the data. The data is in the public domain and may be redistributed.
Use constraints:
None. No restrictions or legal prerequisites for using the data after access is granted. The data is suitable for use at appropriate scale, and is not intended for maps printed at scales greater or more detailed than 1:12,000 scale (1 inch = 1,000 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 CT DEP and the USGS as the source for this information. For example, include the following data source description when printing this information on a map: 1990 Orthophotos - From USGS DOQQ. Source map scale is 1:12,000. Acknowledgement of the U.S. Geological Survey is appreciated in products derived from these data.
Data Security Information
Handling restrictions imposed on the data because of national security, privacy or other concerns.
Security classifiction system: None
Security classification: Unclassified
Security handling: No restrictions for handling the data.
+ Graphic Example
Browse Graphic
Graphic illustration of the data.
Browse graphic 1
Open - Full view of Connecticut 1990 Orthophoto
Graphic Image

Browse graphic 2
Open - Detail view of Connecticut 1990 Color Orthophoto within vicinity of the University of Connecticut at Avery Point in Groton, Connecticut.
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: row and column
Coordinate representation:
Abscissa resolution: 3.281512
Ordinate resolution: 3.281335
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
Left 723965.538291 (survey feet)
Right 1274455.500722 (survey feet)
Top 949451.571377 (survey feet)
Bottom 539009.019041 (survey feet)
In Unprojected coordinates (geographic)
GCS North American 1983
BoundaryCoordinate
West-73.766497 (longitude)
East-71.739317 (longitude)
North42.066805 (latitude)
South40.936016 (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.
Direct spatial reference method: Raster
Raster Information
Type and number of raster spatial objects in the data.
Raster format: FGDBR
Raster object type: Pixel
Number of raster bands: 1
Raster properties
Raster origin: Upper Left
Has pyramid layers: TRUE
Has image colormap: FALSE
Compression type: JPEG
Raster display type: pixel codes
Cell information
Number of cells on x-axis: 167755
Number of cells on y-axis: 125084
Number of cells on z-axis: 1
Bits per cell: 8
Cell Size:
X direction: 3.281512
Y direction: 3.281335
+ 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:
All DOQ header data and image file sizes are validated by Tape Validation System (TVS) software prior to archiving in the Sales Data Base. This validation procedure assures correct physical format and field values for header record  elements. Logical relationships between header record elements are tested.
Completeness report:
All DOQ images are visually inspected for completeness to ensure that no gaps or image misplacement exists in the image area or in overedge coverage. The DOQ images may be derived by mosaicking multiple images, in order to insure complete coverage. All DOQs are cloud free. Some clouds may, very infrequently, be encountered only in the overedge coverage. Source photography is leaf-off in deciduous vegetation regions. Void areas may exist, having a radiometric value of zero and appearing black. These voids are areas for which no photographic source is available or are the result of image transformation from other planimetric systems to the UTM projection. In the latter case, the void sliver areas are on the outside edges of the overedge area. The data set field content of each DOQ header record element is validated to assure completeness prior to archiving in the Sales Data Base.
Cloud cover: 0
Attribute Accuracy
Accuracy of the identification of data entities, features and assignment of attribute values.
Attribute accuracy report:
During photographic reproduction of the source photography, limited analog dodging is performed to improve image quality. Analog dodging consists of holding back light from certain areas of the sensitized photographic material to avoid overexposure. The diapositive is inspected to insure clarity and radiometric uniformity. Diapositive image brightness values are collected with a minimum of image quality manipulation. Image brightness values may deviate from brightness values of the original imagery due to image value interpolation during the scanning and rectification processes. Radiometry is verified by visually inspecting the DOQs to the original unrectified image to determine if the DOQ has the same image quality or better image quality than the original unrectified input image. Slight systematic and radiometric differences can be detected between adjacent DOQ files due primarily to differences in source photography capture dates and Sun angles of aerial photography along flight lines. These differences can be observed in an image's general lightness or darkness when compared to adjacent DOQ file coverages.
Attribute accuracy assessment:
Accuracy values
7.0 meters RMSE
Explanation:
The DOQ root-mean-square-error (RMSE) is the square root of the average of the squared discrepancies. These discrepancies are the differences in coordinate (x and y) values derived by comparing the data being tested with values determined during aerotriangulation or by an independent survey of higher accuracy.
Positional Accuracy
Accuracy of the positional aspects of the data.
Horizontal accuracy report:
The DOQ horizontal positional accuracy and the assurance of that accuracy depend, in part, on the accuracy of the data inputs to the rectification process. These inputs consist of the digital elevation model (DEM), aerotriangulation control and methods, the photo source camera calibration, scanner calibration, and aerial photographs that meet National Aerial Photography Program (NAPP) standards. Field control is acquired by third order class 1 or better survey methods sufficiently spaced to meet National Map Accuracy Standards for 1:12,000-scale (1 inch = 1,000 feet) products. Aerial cameras have current certification from the USGS, National Mapping Division, Optical Science Laboratory. Test calibration scans are performed on all source photography scanners.
		
		Horizontal positional accuracy is determined by the Orthophoto Accuracy (ORACC) software program for DOQ data produced by the National Mapping Division. The program determines the accuracy by finding the line and sample coordinates of the passpoints in the DOQ and fitting these to their ground coordinates to develop a root mean square error (RMSE). From 4 to 9 points are checked. As a further accuracy test, the image line and sample coordinates of the DEM corners are transformed and compared with the actual X,Y DEM corner values to determine if they are within the RMSE. Additional information on this testing procedure can be found in U.S. Department of the Interior, U.S. Geological Survey, 1993, Technical Instructions, ORACC Users Manual (draft): Reston, VA. Adjacent DOQ's, when displayed together in a common planimetric coordinate system, may exhibit slight positional discrepancies across common DOQ boundaries. Linear features, such as streets, may not be continuous. These edge mismatches, however, still conform to positional horizontal accuracy within the NMAS.
		
		Field investigations to validate DOQ positional accuracy reliabilty are periodically conducted by the USGS, National Mapping Division, Geometronics Standards Section. DOQ's produced by cooperators and contractors use similarly approved RMSE test procedures.
Horizontal positional accuracy assessment:
Accuracy values
10
Explanation:
All of the DOQs meet National Map Accuracy Standards (NMAS) at the 1:12,000 scale. These standards specify that 90 percent of all well-defined points in the DOQs tested for positional accuracy must fall within 10 meters of their actual location on the ground. The USGS has verified and accepted these datasets.
Vertical accuracy report:
The vertical accuracy of the verified USGS format DEM is equivalent to or better than a USGS level-1 or -2 DEM.
+ Data Source and Process Information
Data Sources
Information about the source data used to construct or derive the data.
Data source information
DOQQ
Title: 1990 Digital Orthophoto Quarter Quad DOQQ - UTM
Originators: U.S. Geological Survey (original data compiler, editor and publisher)
Series name: USGS Digital Orthophoto Quarter Quadrangles
Publisher: U.S. Geological Suvey
Publication place: Reston, Virgina 22092, USA
Publication date: 1990
Data type: remote-sensing image
Data location: http://www.usgs.gov
Map scale denominator: 12000
Media: disc
Source contribution:
1990 DOQQs for Connecticut produced by the USGS are gray-scale images with 1-meter ground resolution, UTM (NAD83). Image files are in Tagged Image File Format (TIFF) format.
Date: 1990
Currentness reference:
ground condition
DOQQ Conn State Plane
Title: 1990 Digital Orthophoto Quarter Quad DOQQ - Conn State Plane
Originators: State of Connecticut, Department of Environmental Protection (data publisher)
U.S. Geological Survey (original data compiler, editor and publisher)
Publication date: 1990
Data type: remote-sensing image
Data location: http://www.ct.gov/dep
Map scale denominator: 12000
Media: disc
Source contribution:
These are copies of the 1990 DOQQs for Connecticut published by the USGS that have been converted to the Connecticut State Plane Coordinate System, North American Datum of 1983 (NAD83). Map units are feet, not meters. Image files are in Tagged Image File Format (TIFF) format and named ortho_1990_quadxxxxYY.tif, where xxxx is a 4 digit quadrangle number beginning at 0001 and YY identifies the quadrangle quadrange (ne, nw, se, sw). For example, the 4 DOQQs for the Hartford North CT quadrangle (quad 37) are ortho_1990_quad0037ne.tif (quad 37 northeast), ortho_1990_quad0037nw.tif (quad 37 northwest), ortho_1990_quad0037se.tif (quad 37 southeast), and ortho_1990_quad0037sw.tif (quad 37 southwest). 
Date: 1990
Currentness reference:
ground condition
ORTHOPHOTOMOSAIC
Title: Connecticut 1990 Orthophoto Mosaic
Originators: State of Connecticut, Department of Environmental Protection
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut
Publication date: 20070402
Data type: raster digital data
Map scale denominator: 12000
Media: disc
Source contribution:
Statewide raster mosaic of all DOQQ Conn State Plane input rasters. The raster mosaic is in the Connecticut State Plane Coordinate System, North American Datum of 1983 (NAD83).
Date: 1990
Currentness reference:
ground condition
Process Steps
Information about events, parameters, tolerances and techniques applied to construct or derive the data.
Process step information
Process Step 1
Process description:
Primarily using ESRI ArcInfo 7 software, the Connecticut Department of Environmental Protection converted the DOQQs published by the USGS from UTM (meters) to the Connecticut State Plane Coordinate System North American Datum of 1983 (NAD83). Map units are feet, not meters. These DOQQs are in Tagged Image File Format (TIFF) format and named ortho_1990_quadxxxxYY.tif, where xxxx is a 4 digit quadrangle number beginning at 0001 and YY identifies the quarter quadrange (ne, nw, se, sw).
Organization: State of Connecticut, Department of Environmental Protection
Person: Deborah Dumin
Phone: 860-424-3540
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
County: USA
Process date: 1999
Process software and version: ArcInfo 7
Data Source used
DOQQ
Title: 1990 Digital Orthophoto Quarter Quad DOQQ - UTM
Originators: U.S. Geological Survey (original data compiler, editor and publisher)
Series name: USGS Digital Orthophoto Quarter Quadrangles
Publisher: U.S. Geological Suvey
Publication place: Reston, Virgina 22092, USA
Publication date: 1990
Data type: remote-sensing image
Data location: http://www.usgs.gov
Map scale denominator: 12000
Media: disc
Source contribution:
1990 DOQQs for Connecticut produced by the USGS are gray-scale images with 1-meter ground resolution, UTM (NAD83). Image files are in Tagged Image File Format (TIFF) format.
Date: 1990
Currentness reference:
ground condition
Data Source produced
DOQQ Conn State Plane
Title: 1990 Digital Orthophoto Quarter Quad DOQQ - Conn State Plane
Originators: State of Connecticut, Department of Environmental Protection (data publisher)
U.S. Geological Survey (original data compiler, editor and publisher)
Publication date: 1990
Data type: remote-sensing image
Data location: http://www.ct.gov/dep
Map scale denominator: 12000
Media: disc
Source contribution:
These are copies of the 1990 DOQQs for Connecticut published by the USGS that have been converted to the Connecticut State Plane Coordinate System, North American Datum of 1983 (NAD83). Map units are feet, not meters. Image files are in Tagged Image File Format (TIFF) format and named ortho_1990_quadxxxxYY.tif, where xxxx is a 4 digit quadrangle number beginning at 0001 and YY identifies the quadrangle quadrange (ne, nw, se, sw). For example, the 4 DOQQs for the Hartford North CT quadrangle (quad 37) are ortho_1990_quad0037ne.tif (quad 37 northeast), ortho_1990_quad0037nw.tif (quad 37 northwest), ortho_1990_quad0037se.tif (quad 37 southeast), and ortho_1990_quad0037sw.tif (quad 37 southwest). 
Date: 1990
Currentness reference:
ground condition
Process Step 2
Process description:
Using ESRI ArcGIS 9.2 software, an empty raster dataset was created and subequently populated with input rasters to create a statewide raster mosaic.

STEP 1 - Create Raster Dataset - The Coordinate System for the raster dataset is NAD_1983_StatePlane_Connecticut_FIPS_0600_Feet. The image compression type is JPEG with a compression quality of 90. The Pyramid Reference Point X and Y coordinate are 687800 and 1015180, respectively. Pyramids: 8 Bilinear.

CreateRasterDataset "Database Connections\depdbs11_depraster_DEP_DirectConnect.sde" ORTHO_1990 # 8_BIT_UNSIGNED PROJCS['NAD_1983_StatePlane_Connecticut_FIPS_0600_Feet',
GEOGCS['GCS_North_American_1983',
DATUM['D_North_American_1983',
SPHEROID['GRS_1980',6378137.0,298.257222101]],
PRIMEM['Greenwich',0.0],
UNIT['Degree',0.0174532925199433]],
PROJECTION['Lambert_Conformal_Conic'],
PARAMETER['False_Easting',999999.999996],
PARAMETER['False_Northing',499999.999998],
PARAMETER['Central_Meridian',-72.75],
PARAMETER['Standard_Parallel_1',41.2],
PARAMETER['Standard_Parallel_2',41.86666666666667],
PARAMETER['Latitude_Of_Origin',40.83333333333334],
UNIT['Foot_US',0.3048006096012192]] 
1 DEPRASTER "PYRAMIDS 8 BILINEAR" "128 128" "JPEG 90" "687800 1015180" "Database Connections\depdbs11_depraster_DEP_DirectConnect.sde\depgisraster.DEP.ORTHO_1990"

STEP 2 - Mosaic 414 DOQQ input rasters. The Mosaicking Tolerance value was set to 0.2. Consequently, pixel values in the raster mosaic resulted from a resampling of pixels values from individual input rasters when the difference in alignment between input and mosaic (target) pixels exceeded 0.2 pixel width. If the alignment difference is less than 0.2 pixel width, an input pixel value is assigned to the nearby target pixel, and a shift is performed instead of resampling all target pixels. Below is an example usage of the ESRI Geoprocessing Mosaic command and arguments used to mosaic 4 quarter quadrangle input rasters for USGS quadrangle No 50.

Mosaic :\tif_format\ortho_1990_quad0050ne.tif;
Z:\tif_format\ortho_1990_quad0050nw.tif;
Z:\tif_format\qortho_1990_quad0050se.tif;
Z:\tif_format\ortho_1990_quad0050sw.tif
"Database Connections\depdbs11_depraster_DEP_DirectConnect.sde\DEPGISRASTER.DEP.ORTHO_1990"
LAST FIRST # # NONE 0.2
"Database Connections\depdbs11_depraster_DEP_DirectConnect.sde\DEPGISRASTER.DEP.ORTHO_1990"
Organization: State of Connecticut, Department of Environmental Protectino
Person: Howie Sternberg
Phone: 860-424-3540
Fax: 860-424-4058
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
County: USA
Process date: 20070402
Process software and version: ArcGIS 9.2
Data Source used
DOQQ Conn State Plane
Title: 1990 Digital Orthophoto Quarter Quad DOQQ - Conn State Plane
Originators: State of Connecticut, Department of Environmental Protection (data publisher)
U.S. Geological Survey (original data compiler, editor and publisher)
Publication date: 1990
Data type: remote-sensing image
Data location: http://www.ct.gov/dep
Map scale denominator: 12000
Media: disc
Source contribution:
These are copies of the 1990 DOQQs for Connecticut published by the USGS that have been converted to the Connecticut State Plane Coordinate System, North American Datum of 1983 (NAD83). Map units are feet, not meters. Image files are in Tagged Image File Format (TIFF) format and named ortho_1990_quadxxxxYY.tif, where xxxx is a 4 digit quadrangle number beginning at 0001 and YY identifies the quadrangle quadrange (ne, nw, se, sw). For example, the 4 DOQQs for the Hartford North CT quadrangle (quad 37) are ortho_1990_quad0037ne.tif (quad 37 northeast), ortho_1990_quad0037nw.tif (quad 37 northwest), ortho_1990_quad0037se.tif (quad 37 southeast), and ortho_1990_quad0037sw.tif (quad 37 southwest). 
Date: 1990
Currentness reference:
ground condition
Data Source produced
ORTHOPHOTOMOSAIC
Title: Connecticut 1990 Orthophoto Mosaic
Originators: State of Connecticut, Department of Environmental Protection
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut
Publication date: 20070402
Data type: raster digital data
Map scale denominator: 12000
Media: disc
Source contribution:
Statewide raster mosaic of all DOQQ Conn State Plane input rasters. The raster mosaic is in the Connecticut State Plane Coordinate System, North American Datum of 1983 (NAD83).
Date: 1990
Currentness reference:
ground condition
Process Step 3
Process description:
Copied data from ArcSDE 9.1 raster dataset to FileGeodatabase 9.2 raster dataset format for data distribution purposes. The image properties for the FileGeodatabase 9.2 raster dataset are the same as those for the version of the data in ArcSDE. The image compression type is JPEG with a compression quality of 90. Pyramids: 8 Bilinear. The Pixel Type is 8_BIT_UNSIGNED, which supports index values from 0 to 255. Bands: 1. Raster statistics were not built. Below is a record of the ESRI Geoprocessing CopyRaster command and arguments used in copying the data.

CopyRaster "Database Connections\10.18.8.94_depgisraster_DEP.sde\DEPGISRASTER.DEP.ORTHO_1990"
C:\GIS\Geo_Data\Connecticut\Raster_Data\Ortho_1990\Connecticut_Raster_Data.gdb\Ortho_1990
# # # NONE NONE 8_BIT_UNSIGNED

On 04/29/09 the FileGeodatabase was subsequently upgraded to version 9.3.
Organization: State of Connecticut, Department of Environmental Protection
Person: Howie Sternberg
Phone: 860-424-3540
Fax: 860-424-4058
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
County: USA
Process date: 20070622 Process time: 120804
Process software and version: ArcGIS 9.2 and 9.3
Data Source used
ORTHOPHOTOMOSAIC
Title: Connecticut 1990 Orthophoto Mosaic
Originators: State of Connecticut, Department of Environmental Protection
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut
Publication date: 20070402
Data type: raster digital data
Map scale denominator: 12000
Media: disc
Source contribution:
Statewide raster mosaic of all DOQQ Conn State Plane input rasters. The raster mosaic is in the Connecticut State Plane Coordinate System, North American Datum of 1983 (NAD83).
Date: 1990
Currentness reference:
ground condition
Data Source produced
ORTHOPHOTOMOSAIC
Title: Connecticut 1990 Orthophoto Mosaic
Originators: State of Connecticut, Department of Environmental Protection
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut
Publication date: 20070402
Data type: raster digital data
Map scale denominator: 12000
Media: disc
Source contribution:
Statewide raster mosaic of all DOQQ Conn State Plane input rasters. The raster mosaic is in the Connecticut State Plane Coordinate System, North American Datum of 1983 (NAD83).
Date: 1990
Currentness reference:
ground condition
ESRI geoprocessing history
Description of ESRI geoprocessing commands, settings, and tolerances applied to the data.
ESRI geoprocessing command information
1 CopyRaster_1
Date: 20070622 Time: 120804
Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\CopyRaster
Command issued: CopyRaster "Database Connections\10.18.8.94_depgisraster_DEP.sde\DEPGISRASTER.DEP.ORTHO_1990" C:\GIS\Geo_Data\Connecticut\Raster_Data\Ortho_1990\Connecticut_Raster_Data.gdb\Ortho_1990 # # # NONE NONE 8_BIT_UNSIGNED
+ 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 1990 Orthophoto
Distribution liability:
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.
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@po.state.ct.us
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
County: USA
Standard Order Process
Common ways in which data may be obtained.
Digital form:
Format name: ArcSDE Export
Format version number: 9.1
Format information content:
ArcSDE Raster Dataset
Digital transfer option:
Offline option:
Offline media: disc
Fees: An offline 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: 20090429
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@po.state.ct.us
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
County: USA
Metadata Access Constraints
Restrictions and legal prerequisites for accessing or using the data after access is granted.
Access constraints:
None. No restrictions or legal prerequisites for accessing the metadata.
Use constraints:
None. No restrictions or legal prerequisites for using the metadata after access is granted.
Metadata Security Information
Handling restrictions imposed on the metadata because of national security, privacy or other concerns.
Security classifiction system: None
Security classification: Unclassified
Security handling: No restrictions for handling the metadata.
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.