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Bi-level scanned file
A scanned file containing values of 1 or 0.
A raster data structure that stores cell values in a matrix by row and column.
Reduction of data volumes, especially for raster data.
Digital elevation model (DEM)
A digital model with an array of uniformy spaced elevation data in raster format.
Digital orthophoto quad (DOQ)
A digitized image prepared from an aerial photograph or other remotely sensed data, in which the displacement caused by camera tilt and terrain relief has been removed.
Digital raster graphic (DRG)
A scanned image of a USGS topographic map.
A propriety ESRI format for raster data.
A raster that contains cells of continuous values.
A raster that has been processed to align witha projected coordinate system.
A raster that contains cell values of integers.
An orbiting satellite that provides repeat images of the Earth's surface. Landsat 7 was launched in April 1999.
One type of data compression that allows the original image to be precisely reconstructed.
One type of data compression that can achieve high-compression ratios but cannot reconstruct fully the original image.
A raster data structure that divides a raster into hierarchy quadrants.
Raster data model
A data model that uses rows, columns, and cells to construct spatial features.
Conversion of vector data to raster data.
Run length encoding (RLE)
A raster data structure that records the cell values by row and by group. A run-length compressed (RLC) file.
A french satellite that provides repeat images of the Earth's surface. SPOT 5 was launched in May 2002.
Conversion of raster data to vector data.
A new image compression technique that treats an image as a wave and progressively decomposes the wave into simpler wavelets.