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GRANIT Metadata for 1962 Digital Orthophoto Mosaic - 1:18,000-Scale - Strafford County, New Hampshire

GRANIT Metadata for 1962 Digital Orthophoto Mosaic - 1:18,000-Scale - Strafford County, New Hampshire

Title: 1962 Digital Orthophoto Mosaic - 1:18,000-Scale - Strafford County, New Hampshire
Time Period of Content: 11/07/1962 - 05/12/1964 Initial Publication Date: 01/2004
Originator: Complex Systems Research Center, University of New Hampshire
Abstract:
This data set is a countywide mosaic of 1:18,000-scale, black & white aerial photos. It was developed by scanning and orthorectifying 272 individual photographs, and combining a subset of the resulting digital images into the mosaic. The final orthophoto mosaic combines the image characteristics of the source photographs with the geometric qualities of a map. While the data set name suggests that all source photos were collected in 1962, there were small regions within the county for which this source was not available. For those areas, 1964-vintage photographs were substituted. Complete details on the collection date of each input photograph may be obtained from the GRANIT Database Manager (see Distribution section). In addition to the hardcopy photos, the primary data sources used in the photo orthorectification included 1998 1:12,000-scale Digital Orthophoto Quarterquads (DOQs), 1974 1:20,000-scale digital orthophotos, and 30-meter Digital Elevation Models (DEMs). The mosaic is provided in IMAGINE (*.img/.ige) format. A MrSID (*.sid) version of the mosaic is also available, but image quality may be poorer due to the compression applied. The 272 individual orthophotos, in .tif format, are also available. The normal orientation of the 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 radiometric image brightness values are stored as 256 gray levels ranging from 0 to 255. Note that sections of this metadata record, in particular the Data Quality section, describe the processing performed on the photos used to generate the mosaic.
Theme Keywords: Digital orthophoto, Digital image map, Aerial photograph, Rectified photograph, Rectified image, Orthophoto, Historic
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