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GIS.NY.GOV

NYS ITS GIS Program Office

Geographic Information Systems Clearinghouse

 

The New York State
Statewide Digital Orthoimagery Program (DOP)



 

PROGRAM OPTIONS:

The following are the options provided by the current Digital Orthoimagery Program (DOP) for digital orthoimagery coverage:

Base Products
  • 1 ft resolution 4-band imagery from digital camera for urban areas with accuracy of ± 4 ft at the 95% confidence level, (approximated by the U.S. Department of Transportation Federal Aid Urban Area designations).
  • 2 ft resolution 4-band imagery from digital camera for non-urban areas, with accuracy of ± 8ft at the 95% confidence level.
  • Note: 4-band imagery contains both color and infrared bands. Many users now have the capability of displaying color infrared images at no extra cost.

Optional Upgrades - available for entire counties or designated urban areas

  • Separate 3-band Color Infrared (CIR) in addition to 4-band image.
  • 1 ft resolution substituted for 2 ft resolution (i.e. flown at lower altitude).
  • 0. 5 ft resolution substituted for the 1 ft resolution (i.e. flown at lower altitude) in select areas.
  • True ortho rectification in select areas of 1 ft & 0.5 ft imagery. True ortho rectification removes building lean in dense urban areas.

Optional upgrades as defined above are substitutions for base products; that is, no county or urban area will be covered by more than one product, except along the boundaries of the areas of coverage where overlapping coverage will be required to produce uniform coverage.

In recent years of the program, participants obtaining optional upgrades have included Counties and several State Agencies. Cost estimates for options are provided to all counties in each annual lot in the year prior to the year the lot will be flown.

Previous Base Products - currently available for download.

2006 - 2009

  • 1 ft natural color imagery from digital camera for urban areas with accuracy of ± 4 ft at the 95% confidence level, (approximated by the U.S. Department of Transportation Federal Aid Urban Area designations).
  • 2 ft natural color imagery from digital camera for non-urban areas, with accuracy of ± 8ft at the 95% confidence level.

2001 - 2005

  • 1 ft natural color imagery for urban areas with accuracy of ± 4 ft at the 95% confidence level, (approximated by the U.S. Department of Transportation Federal Aid Urban Area designations).
  • 2 ft panchromatic (black and white) imagery for non-urban areas, with accuracy of ± 8ft at the 95% confidence level.
  • Note: in 2003, the non-urban 2 ft product was color infrared.

FREQUENTLY ASKED QUESTIONS (FAQ'S):

Question:
What is Digital Orthoimagery?

Answer:
Digital Orthoimagery is vertical aerial imagery that has had all distortions caused by ground elevation changes and camera distortions removed through computer processing and placed in a digital format that can be used with computer applications. A digital orthoimage combines the rich information content of an aerial photo with the accuracy and spatial registration of a map.

Question:
What is the Statewide Digital Orthoimagery Program?

Answer:
This is a program that will produce digital orthoimages of approximately 25% of NYS each year. It is intended to be an up-to-date, continuous program so that digital orthoimagery will be available on a continuous cycle.

Question:
How is Digital Orthoimagery used?

Answer:

Question:
How is Digital Orthoimagery distributed?

Answer:
Digital Orthoimagery from the mid-1990's is distributed on-line through the GIS Clearinghouse. Since April of 2000, approximately 50,000 digital orthoimages have been downloaded. New digital orthoimagery will also be distributed via the GIS Clearinghouse.

Counties will receive copies of the imagery for their own use.

Question:
Which coordinate system is used?

Answer:
Within the State's program, orthoimagery will be produced in the relevant zone of the New York State Plane Coordinate System, referencing the North American Datum of 1983. The units will be US Survey Feet. This combination was chosen to match the coordinate system used by most counties.

New York State is no longer providing imagery in the Universal Transverse Mercator projection. Most of the current GIS software programs are capable of "on the fly" reprojection of imagery, making UTM imagery redundant. With the savings gained by having only one version of the imagery created, the State can acquire a larger geographic area. The last Annual Lot for which UTM imagery is available is the 2005 Annual Lot.