USGS 1995 – 1997 Digital Orthophoto Quadrangles for New Jersey
NJ Office of Information Technology (NJOIT), Office of Geographic Information Systems (OGIS)
Digital orthophotography of New Jersey, distributed as a Web Map Service (WMS). The service displays 3 band false color infrared (near IR) imagery acquired under leaf-off conditions. The native data set spatial reference system is State Plane Coordinate System NAD83 Coordinates, U.S. Survey Feet. In most client software, the default spatial reference system of the service will be Geographic Coordinates, WGS84.
Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquad (DOQ) product of the US Geological Survey is 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 data set for this service was derived from this product.Most of the imagery in this data set was captured in spring of 1995. Some of the state required reflight in 1997.This data set began as the DOQ product described above. Quarter quad images were then reprojected to NJ State Plane coordinates (NAD83), and converted to MrSID compressed format. The MrSID images were indexed and are served as a seamless Web Map Service (WMS).
Horizontal Position Accuracy
USGS statement for the DOQ program: 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. The vertical accuracy of the verified USGS format DEM is equivalent to or better than a USGS level 1 or 2 DEM, with a root mean square error (RMSE) of no greater than 7.0 meters. Field control is acquired by third order class 1 or better survey methods sufficiently spaced to meet National Map Accuracy Standards (NMAS) for 1:12,000-scale 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.Production of the MrSID version of the imagery slightly alters the apparent positions of features. Although no post-production testing was performed of the NJ State Plane MrSID version of the imagery, user experience suggests that the imagery generally meets Nation Map Accuracy Standards for 1:12000 scale maps. Resampling during production of the WMS image also slightly alters apparent positions of features.
Acknowledgement of the NJ Office of Information Technology, U.S. Geological Survey, and NJDEP would be appreciated in products derived from these data.
The State of New Jersey provides the data set “as is”. The State makes no guarantee or warranty concerning the accuracy of information contained in the data. Also, the State makes no warranty, either expressed or implied, regarding the condition of the product or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data files have been processed successfully on computers at the State, no warranty is made by the State regarding the use of the data on any other system, nor does the fact of distribution constitute or imply such a warranty.
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