USGS 2008 High Resolution Orthoimagery Index for the Bridgeport, Hartford, and New Haven, Connecticut Urban Areas

Frequently-asked questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. Where did the data come from?
  2. What changes have been made?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
  6. Is there some other way to get the data?
  7. What hardware or software do I need in order to use the data set?
• Who wrote the metadata?

USGS 2008 High Resolution Orthoimagery Index for the Bridgeport, Hartford, and New Haven, Connecticut Urban Areas contains polygon features that delineate the boundaries used in the creation of the 2008 USGS High Resolution Area digital ortho photos for the Bridgeport, Hartford, and New Haven Connecticut urban areas. This index grid may be used to determine the orthophoto image files that aquired for the aerial photography, which was taken during the spring of 2008. It is 1 foot  orthorectified imagery, 3Band (natural color), leaf off. The ground resolution for this imagery is 1 foot per image pixel.

1. How should this data set be cited?
   
   
   U.S. Geological Survey, State of Connecticut, Department of Energy and Environmental Protection, 20091005, USGS 2008 High Resolution Orthoimagery Index for the Bridgeport, Hartford, and New Haven, Connecticut Urban Areas: U.S. Geological Survey, Sioux Falls, SD.
   
   
   Online links:

   • http://www.ct.gov/deep

   
   
2. What geographic area does the data set cover?
   
   
   Bounding coordinates:

   West: -73.773336

   East: -72.111622

   North: 42.009657

   South: 40.991647
   
   
3. What does it look like?
   
   
   http://www.cteco.uconn.edu/metadata/dep/browsegraphic/orthoindex2008usgsfullview.gif (GIF)

   Full view of 2008 High Resolution Urban Area Orthoimagery Index
   
   
   http://www.cteco.uconn.edu/metadata/dep/browsegraphic/orthoindex2008usgsdetailview.gif (GIF)

   Detail view of 2008 High Resolution Urban Area Orthoimagery Index
   
   
4. Does the data set describe conditions during a particular time period?
   
   
   Calendar date: 20080401
   Currentness reference:

   ground condition when photography was acquired

   
   
5. What is the general form of this data set?
   
   
   Geospatial data presentation form: vector digital data
   
   
6. How does the data set represent geographic features?
   
   
   1. How are geographic features stored in the data set?
      
      
      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • G-polygon (2923)
      
      
   2. What coordinate system is used to represent geographic features?
      
      
      The map projection used is Lambert Conformal Conic.

      
      

      Projection parameters:

      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 coordinates are encoded using coordinate pair.

      Abscissae (x-coordinates) are specified to the nearest 0.000328.

      Ordinates (y-coordinates) are specified to the nearest 0.000328.

      Planar coordinates are specified in survey feet.

      
      

      The horizontal datum used is North American Datum of 1983.

      The ellipsoid used is Geodetic Reference System 80.

      The semi-major axis of the ellipsoid used is 6378137.000000.

      The flattening of the ellipsoid used is 1/298.257222.

      
      Vertical coordinate system definition:

      Altitude system definition:

      Altitude resolution: 1.000000

      Altitude encoding method: Explicit elevation coordinate included with horizontal coordinates

      
      
7. How does the data set describe geographic features?
   
   
   USGS 2008 High Resolution Orthoimagery Index

   OBJECTID

   Internal feature number. (Source: ESRI)
                     

   
   

   Sequential unique whole numbers that are automatically generated.

   
   

   ORTHO_TILE

   Orthophoto tile name - Unique name assigned to each orthophoto tile, which is the basis for individual image files names such as 18TXL660975.tif

   
   

   SHAPE

   Feature geometry. (Source: ESRI)
                     

   
   

   Coordinates defining the features.

   
   

   SHAPE.area

   SHAPE.len

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   
   
   • U.S. Geological Survey
   • State of Connecticut, Department of Energy and Environmental Protection
   
   
2. Who also contributed to the data set?
   
   
3. To whom should users address questions about the data?
   
   

This index is used to determine the name of the orthophoto image file aquired for each tile. 

1. Where did the data come from?
   
   
2. What changes have been made?
   
   

1. How well have the observations been checked?
   
   
2. How accurate are the geographic locations?
   
   
3. How accurate are the heights or depths?
   
   
4. Where are the gaps in the data? What is missing?
   
   
5. How consistent are the relationships among the observations, including topology?
   
   

None. No restrictions or legal prerequisites for using the data.

Who distributes the data set?


What's the catalog number I need to order this data set?


USGS 2008 High Resolution Orthoimagery Index for the Bridgeport, Hartford, and New Haven, Connecticut Urban Areas


What legal disclaimers am I supposed to read?


How can I download or order the data?


• Availability in digital form:




Data format:	in format Shapefile, Feature Class (version ArcGIS)
Network links:	http://www.ct.gov/deep



• Cost to order the data: An online copy of the data may be accessed without charge.



Is there some other way to get the data?


What hardware or software do I need in order to use the data set?

79 Elm Street