U.S. Geological Survey
State of Connecticut, Department of Environmental Protection
20090101
USGS 2008 High Resolution Orthoimagery for the Bridgeport, Hartford, and New Haven, Connecticut Urban Areas
SDE raster digital data
Urban Area Orthoimagery
0.1
Sioux Falls, SD
U.S. Geological Survey
http://www.ct.gov/deep
This is a raster mosaic of 2008, natural color, leaf off, 1 ft ground sample distance imagery from the U.S. Geological Survey for the Bridgeport, Hartford and New Haven, Connecticut Urban Areas. Imagery only exists for these three geographic regions.
This task order consists of digital orthophoto production covering the CT Cities 133 Urban Area footprint. An orthoimage is remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthoimagery combines the image characteristics of a photograph with the geometric qualities of a map.
High Resolution Orthoimagery provides a critical tool for those involved in development decisions such as resource managers and city planners. The detailed focus of High Resolution Orthoimagery provides emergency responders critical information in determining the best evacuation routes, alternative routes and safe access to aid. High Resolution Orthoimagery assists law enforcement personnel in determining the best locations to place surveillance cameras in high-traffic urban areas and popular attractions. A digital orthoiamge is a geometrically accurate photographic record of landscape conditions at the time of the corresponding aerial photography. As such, the digital orthoimage is useful for a variety of applications, such as environmental monitoring, facility engineering/maintenance, city/county planning, property line review, etc. The digital orthoimage can be used alone or as a raster basemap for corresponding vector line mapping. The data assists Federal, State and local emergency responders in planning for homeland security efforts. This data also supports The National Map.
The raster mosaic of 2008 USGS Urban Area Orthoimagery was prepared by the State of Connecticut, Department of Environmental Protection (CT DEP) using data provided by the USGS. The original input rasters are in GeoTIFF format and in NAD 1983 UTM Zone 18N Meters. These data are also available online from USGS National Map Seamless Server. The individual rasters were projected to NAD 1983 StatePlane Connecticut FIPS 0600 Feet and merged together in the resulting mosaic for the Bridgeport, Hartford, and New Haven Connecticut Urban Areas.
The data obtained through The National Map Seamless Server is considered to be the "best available" data from USGS. Historical data and other data may be obtained by contacting Customer Services, Earth Resources Observation and Science Center at 1-800-252-4547. Information in quotation marks, initial processing steps, accuracy reports, and source information is taken directly from the original metadata. Spatial-specific information not available
200804
ground condition
Irregular
-73.773334
-72.111624
42.009657
40.991646
ISO 19115 Topic Category
imageryBaseMapsEarthCover
010
geoscientificInformation
080
location
013
None
digital spatial data
0.3 meter orthoimage
rectified image
orthophoto
natural color orthophoto
orthoimage
image map
2008
USGS
High Resolution Urban Area
American Society of Photogrammetry and RemoteSensing
National Standards for Spatial Digital Accuracy (NSSDA)
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.
United States of America
USA
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.
Connecticut
CT
U.S. Department of Commerce, 1995, Countries, dependencies, areas of special sovereignty, and their principal administrative divisions, Federal Information Processing Standard 10-4,): Washington, D.C., National Institute of Standards and Technology
United States
U.S.
US
Counties and County Equivalents of the States of the United States and the District of Columbia (FIPS Pub 6-3)
Fairfield County
Hartford County
Middlesex County
New Haven County
New London County
Geographic Names Information System
City of Bridgeport
City of Hartford
City of New Haven
State of Connecticut
Any downloading and use of these data signifies a user's agreement to comprehension and compliance of the USGS Standard Disclaimer. Insure all portions of metadata are read and clearly understood before using these data in order to protect both user and USGS interests.
There is no guarantee of warranty concerning the accuracy of the data. Users should be aware that temporal changes may have occurred since this data set was collected and that some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. Acknowledgement of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data is obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data, nor to imply that changes made were approved or endorsed by the U.S. Geological Survey. Please refer to http://www.usgs.gov/privacy.html for the USGS disclaimer.
U.S. Geological Survey
Customer Services Representative
mailing and physical address
USGS Earth Resources Observation and Science Center
47914 252nd Street
Sioux Falls
SD
57198-0001
USA
605/594-6151
1-800-252-4547
605/594-6933
605/594-6589
custserv@usgs.gov
0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
http://www.cteco.uconn.edu/metadata/dep/browsegraphic/orthophoto2008usgsurbanareafullview.gif
Full view of USGS High Resolution Orthoimagery for the Bridgeport, Hartford, and New Haven, Connecticut Urban Areas
GIF
http://www.cteco.uconn.edu/metadata/dep/browsegraphic/orthophoto2008usgsurbanareadetailview.gif
Detail view of USGS High Resolution Orthoimagery for the Bridgeport, Hartford, and New Haven, Connecticut Urban Areas within vicinity of the Connecticut Department of Environmental Protection building at 79 Elm Street in Hartford, Connecticut.
GIF
U.S. Geological Survey and Aero-Metric, Inc.
None
Unclassified
N/A
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.
Radiometry is verified by visual inspection of the digital orthophoto. Slight systematic radiometric differences may exist between adjacent orthoimage files; these are due primarily to differences in source image capture dates and sun angles along flight lines. These differences can be observed in an image's general lightness or darkness when it is compared to adjacent orthoimage file coverages. Tonal balancing may be performed over a group of images during the mosaicking process which may serve to lighten or darken adjacent images for better color tone matching.
GeoTIFFs conform to the specifications set forth by the USGS for production of 133 UA orthophotos.
Orthoimages are visually inspected for completeness to ensure that no gaps or image misplacements exist within and between adjacent images. These images are derived by mosaicking multiple images to ensure complete coverage. Source imagery is cloud free.
The relative accuracy is assembled by comparing rectified images generated from adjacent strips of imagery. The absolute accuracy is assessed by measuring the ground control points in the rectified image against the actual surveyed co-ordinate position. The testing is for overall accuracy. This data has been produced to be fully compliant with the National Map Accuracy Standards (NMAS) for mapping at this scale.
There is no vertical accuracy component to orthophotography.
Aero-Metric, Inc.
2008
028014
remote-sensing image
21,600
stable-base material
20080408
ground condition
Image
Source imagery for orthophoto production.
U.S. Geological Survey
2008
USGS DEM
CD-ROM
unknown
ground condition
DEM
Used to provide ground elevations for orthorectification process.
Aero-Metric, Inc.
2008
CT Cities Aerotriangulation
CD-ROM
200804
ground condition
AT
Used to provide photo exterior orientations for orthorectification process.
U.S. Geological Survey
2008
TIFF Orthophotos of USGS 2008 High Resolution Orthoimagery for the Bridgeport, Hartford, and New Haven, Connecticut Urban Areas
raster digital data
Urban Area Orthoimagery
0.1
Sioux Falls, SD
U.S. Geological Survey
http://seamless.usgs.gov
http://www.ct.gov/deep
disk
200804
ground condition
TIFF
U.S. Geological Survey
State of Connecticut, Department of Environmental Protection
2009
USGS 2008 High Resolution Orthoimagery for the Bridgeport, Hartford, and New Haven, Connecticut Urban Areas
raster digital data
Urban Area Orthoimagery
0.1
Sioux Falls, SD
U.S. Geological Survey
http://www.ct.gov/deep
disk
200804
ground condition
mosaic
Statewide mosaic of all Orthophoto TIFFS
The raw scanned photos were aerotriangulated to support digital ortho image production for the CT Cities project area. Airborne GPS and ground check point data was provided by AERO-METRIC, Inc. The project was referenced to the North American Datum of 1983 (NAD83), Universal Transverse Mercator, Zone 18 horizontally and to the North American Vertical Datum of 1988 (NAVD88) vertically. Units were in meters.The scanned images (14 micron), ABGPS data, ground check point data, and camera calibration data were used as inputs to the Zeiss/Intergraph ImageStation Automatic Triangulation (ISAT) softcopy program. ISAT correlated image points and aerotriangulated the block of images to create exposure station exterior orientations. All ground checkpoints were manually measured on the imagery. These ground checkpoints were included in the aerotriangulation adjustments as unconstrained points for absolute ground location verification.The scale of the aerial photos was 1:21,600. The photography was exposed on 4/2/08, 4/3/08 and 4/8/08.Rectification was done using the aerotriangulation data, scans, NED data. These rectified images were used to draw seamlines. The images were then dodged. The dodged rectified images were mosaicked, balanced, and cut into final image sheets. The final sheets were viewed and artifacts were removed as well as other edits performed.
Image
DEM
AT
200812
TIFF
The metadata were imported and updated for display through The National Map Seamless Server at http://seamless.usgs.gov Project level metadata are available in several formats: HTML, TEXT, XML, FAQ and SGML.
TIFF
TIFF
Customer Service Representative
U.S. Geological Survey
mailing and physical address
USGS Earth Resources Observation and Science Center
47914 252nd Street
Sioux Falls
SD
57198-0001
USA
605-594-6151
1-800-252-4547
605-594-6933
605-594-6589
custserv@usgs.gov
0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
The USGS point of contact is for questions relating only to the data display and download from this web site. For questions regarding data content and quality, refer to original processor.
Using ESRI ArcGIS 9.2 software, an empty raster dataset was created and subsequently populated with input rasters to create a statewide raster mosaic. The State of Connecticut, Department of Environmental Protection obtained these TIFF images from the U.S. Geological Survey.
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 75. The Pyramid Reference Point X and Y coordinate are 687800 and 1015180, respectively. Bands: 3. Pyramids: 12 Bilinear. The Pixel Type is 8_BIT_UNSIGNED, which supports index values from 0 to 255. Raster statistics were not built. Below is a record of the ESRI Geoprocessing CreateRasterDataset command and arguments that created the empty raster dataset.
CreateRasterDataset C:\CT\2008\Connecticut_Ortho_2008_Urban_Area.gdb Ortho_2008_Color_USGS_Urban_Area # 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]]
3 # "PYRAMIDS 12 BILINEAR" "128 128" "JPEG 75" "687800 1015180" C:\CT\2008\Connecticut_Ortho_2008_Urban_Area.gdb\Ortho_2008_Color_USGS_Urban_Area
STEP 2 - Mosaic input rasters for the Bridgeport, Hartford, and New Haven Urban Area. The Ignore Background Value was set to one (1). The NoData value was left blank. The Mosaicking Tolerance value was set to zero (0). Consequently, pixel values in the raster mosaic resulted from a resampling of pixels values from individual input rasters due to the difference in alignment of input and mosaic (target) pixels. Note, in the resulting mosaic, the input rasters in NAD 1983 UTM Zone 18N Meters were projected to NAD 1983 StatePlane Connecticut FIPS 0600 Feet.
TIFF
20091005
mosaic
State of Connecticut, Department of Environmental Protection
Howie Sternberg
mailing and physical address
79 Elm Street
Hartford
Connecticut
06106
USA
860-424-3540
860-424-4058
dep.gisdata@po.state.ct.us
Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Raster
Pixel
365777
447307
1
Lambert Conformal ConicLambert Conformal Conic41.20000041.866667-72.75000040.833333999999.999996499999.999998
row and column
1.009689
1.009689
survey feet
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
1.000000
Explicit elevation coordinate included with horizontal coordinates
Natural color orthoimagery is organized in three color bands or channels which represent the red, green, and blue portions of the spectrum. Each image pixel is assigned a triplet of numeric values, one for each color band. Numeric values range from 0 to 255. Areas where data is incomplete due to lack of full image coverage are represented with the numeric value of 0.
U.S. Department of the Interior, U.S. Geological Survey, 1999, Standards for Digital Orthoimagery: Reston, VA
U.S. Geological Survey
Customer Services Representative
mailing and physical address
Earth Resources Observation and Science Center
47914 252nd Street
Sioux Falls
SD
57198-0001
USA
605/594-6151
1-800-252-4547
605/594-6933
605/594-6589
custserv@usgs.gov
0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
The USGS point of contact is for questions relating only to the data display and download from this web site. For questions regarding data content and quality, refer to the original processor.
USGS 2008 High Resolution Orthoimagery for the Bridgeport, Hartford, and New Haven, Connecticut Urban Areas
Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty. Data may have been compiled from various outside sources. Spatial information may not meet National Map Accuracy Standards. This information may be updated without notification. The USGS shall not be liable for any activity involving these data, installation, fitness of the data for a particular purpose, its use, or analyses results.
TIFF
ArcGIS 9.3
Raster
Natural Color
0.001
http://seamless.usgs.gov
The URL http://seamless.usgs.gov provides a map interface that allows for data downloads within a customer defined area of interest. Zoom tools are available that can be used to investigate areas of interest on the map interface. The download tool allows the customer to capture layers from the map, utilizing The National Map Seamless Server process for downloading. A request summary page is then generated with the download layers listed. By clicking the "download" button on the summary page, a zipped file will be generated that can be saved on the customer's computer. The file can then be unzipped and imported into various user software applications.
Not available for dissemination
CD-ROM
ISO 9660 Mode 1 Level 2 Extensions
None
Variable
ESRI ArcGIS Suite and/or Arc/Info or other compatible software, and supporting operating systems.
2009
unknown
State of Connecticut, Department of Environmental Protection
mailing and physical address
79 Elm Street
Hartford
Connecticut
06106-5127
USA
860-424-3540
860-424-4058
dep.gisdata@ct.gov
Monday to Friday, 08:30 to 16:30 Eastern Standard Time
USGS 2008 High Resolution Orthoimagery for the Bridgeport, Hartford, and New Haven, Connecticut Urban Areas
Although these data have been used by the State of Connecticut, no warranty, expressed or implied, is made by the State of Connecticut as to the accuracy of these 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 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.
Raster Dataset
ArcGIS
http://www.ct.gov/deep
disk
An offline copy of the data may be accessed without charge
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.
Geographic information sytem (GIS), computer-aided drawing or other mapping software is necessary to display, view and access the information.
20111227
U.S. Geological Survey (Original metadata provided by USDA was modified by Howie Sternberg of CT DEP to document the process undertaken to create and distribute a statewide mosaic)
Customer Services Representative
mailing and physical address
USGS Earth Resources Observation and Science Center
47914 252nd Street
Sioux Falls
SD
57198-0001
USA
605/594-6151
1-800-252-4547
605/594-6933
605/594-6589
custserv@usgs.gov
0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
The above is the contact information for the Earth Resources Observation and Science Center in Sioux Falls, SD. This is the digital data storage and distribution center for the USGS.
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
None.
None.
None
Unclassified
None
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile