USGS 1995 - 1997 Digital Orthophoto Quadrangles for New Jersey (NJSPC, NAD83; JPEG format)  
Downloadable Data 
USGS 1995 - 1997 Digital Orthophoto Quadrangles for New Jersey (NJSPC, NAD83; JPEG format)
 
Keywords:
  Theme:   imageryBaseMapsEarthCover, DOQ, DOQQ, digital orthophoto, digital orthophotoquad, digital image map, aerial photograph, rectified photograph, rectified image, orthophoto, quarter-quadrangle orthophoto, 1-meter orthophoto, 2-meter orhtophoto, 3.75- x 3.75-minute orthophoto, 7.5- x 7.5-minute orthophoto 
  Place:   US, 34, New Jersey, NJ, statewide 
 
Description:
  Abstract:  Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquad (DOQ) 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 geographic extent of the DOQ is equivalent to a quarter-quad plus overedge. The overedge ranges a minimum of 50 meters to a maximum of 300 meters beyond the extremes of the primary and secondary 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 standard, archived digital orthophoto is formatted as four ASCII header records, followed by a series of 8-bit binary image data records. The radiometric image brightness values are stored as 256 gray levels ranging from 0 to 255. The metadata provided in the digital orthophoto contain a wide range of descriptive information including format source information, production instrumentation and dates, and data to assist with displaying and georeferencing the image. The standard distribution format of DOQs will be JPEG compressed images on CD-ROM by counties or special regions. The reconstituted image from the CD-ROM will exhibit some radiometric differences when compared to its uncompressed original but will retain the geometry of the uncompressed DOQ. Uncompressed DOQs are distributed on tape.This data set began as the product described above. Quarter quad images were then reprojected to NJ State Plane coordinates (NAD83), and converted to MrSID and JPEG compressed formats.
  Purpose:  DOQ's 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 digital line graphs and topographic maps.
  Supplemental Information:  Plans are for national coverage. This metadata record is a data-set level implementation of the Federal Geographic Data Committee's Content Standards for Digital Geospatial Metadata. Information about county and individual DOQ records can be obtained from the EROS Data Center. Information from:URL:http://ask.usgs.gov Maintainer: edcnsdi@edcwww.cr.usgs.gov. NOTE: The raw image files received from the USGS for this project were uncompressed binary files, in UTM meters, NAD83. Since the data base for NJDEP is cast on New Jersey State Plane Coordinate System (NJSPC), in feet, NAD83, these image files had to be projected from UTM meters to NJSPC feet to be compatible with all other data layers in the NJDEP's GIS.Please read the Process Description section concerning the NJDEP Production Process. Much of the metadata information was provided by the USGS and relates to the UTM version of the standard product. Some metadata information has been changed to reflect NJ coordinates, information, etc.
 
Publisher Information
  Publisher:   NJ Department of Environmental Protection (NJDEP), Office of Information Resources Management (OIRM), Bureau of Geographic Information Systems (BGIS) 
  Publication Place:   Trenton, NJ 
  Publication Date:   1999 
  Direct NJGIN
metadata link:  
https://njgin.state.nj.us/NJ_NJGINExplorer/ShowMetadata.jsp?docId=BCC425DA-47CC-11D9-9B7A-0003BA02A824 
 
Spatial Domain:
  West Coordinate:   -75.55 
  East Coordinate:   -73.89 
  North Coordinate:   41.36 
  South Coordinate:   38.93 
  Coverage Area:   US 
 
Spatial Data Information:
  Data Type:   Raster 
  Data Format:   JPEG 
  Resolution:   X Axis - 1, Y Axis - 1, Units - meters  
 
Time period for which the data is relevant:
  Beginning Date:   1995 
  Ending Date:   1997 
 
Status of the Data:
  Progress:   Complete 
  Data Update Frequency:   five years 
 
Data Storage and Access Information:
  Access Constraints:  none
  Use Constraints:  None. Acknowledgement of the U.S. Geological Survey and NJDEP would be appreciated in products derived from these data.
  Online Linkage:  http://njgin.nj.gov/OIT_IW/index.jsp

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