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Steady increases in coastal development bring with it non-point source pollution, erosion and other environmental threats. In an effort to improve our understanding of these changes, the C-CAP program has strived to develop a nationally accepted standard protocol for monitoring land cover and habitat changes for coastal regions of the U.S. The St. Croix Estuary is the second release in this series of CD-ROM datasets. Historically valuable as a habitat for salmon, this area is now threatened by changes from the large Maine and Canadian forestry industries. Understanding where and how these changes are occurring is important for sound resource management decisions.
Each data set is approximately 16 megabytes in size (4212 pixels per row, 3821 rows). The data are not explicitly georeferenced, but may be by using a Geographical Information System (GIS). Fifteen land cover classes are defined for the land cover analyses, and 225 potential classes result from the various combinations of changes between 1985 and 1992.
The data are in a binary unblocked format. A record equals one row of
pixels, and the first data record value is in the upper left-hand corner
of the image.
The positional accuracy and precision of this data set are based on the Landsat Thematic Mapper database. Nominally the source data are 30 meter by 30 meter cells with a positional accuracy of 0.5 cells (15 m) in each direction. Additional uncertainties, however, reduce the spatial precision of the data set to about 1.5 cells (45 m) in each direction. This, in turn, yields a minimum detection unit of 3 cells by 3 cells (90 m by 90m) or about 2.5 acres.
Tests indicate that overall confidence in the satellite derived maps is comparable to aerial photograph/field maps for spatial resolutions of 2.5 acres or greater. Logical consistency tests insure that all row and column positions in the selected latitude/longitude window contain data. Conversion and integration with vector files indicate that all positions are consistent with earth coordinates covering the same area.
The classification scheme comprehensively includes all anticipated land covers, and all pixels have been classified.
This CD-ROM includes GeoVu display software developed by the National Geophysical Data Center. Some features of this software include enabling the user to select and view a specific data set, browse the data documentation, identify the geographic area of interest, and view the land-cover classification codes. Users may display images using prepackaged palettes or develop their own. Data may be displayed on the screen, saved to disk, or copied to floppy diskette.
All customers may order online using Visa, MasterCard, American Express, or Discover, and receive the discounted price of $90 (plus shipping and handling). Credit card orders at the standard price* of $120 (plus shipping and handling) are also accepted via telephone, fax or e-mail at the National Oceanographic Data Center:
Customers wishing to purchase these products using a check or money order must mail their order to:
When mailing an order please indicate the exact product desired and include the customer name and shipping address with the check!
* The discounted price is available only to government agencies, universities, and other non-profit organizations within the United States, unless the order is placed via the NNDC online store. NOAA regulations require prepayment on all fixed-price products.
|Last modified: Wed, 10-Oct-2007 20:03 UTC||NODC.Webmaster@noaa.gov|
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