Geographic Information Systems (GIS) • 343
at http://grass.osgeo.org/. The US Army Construction Engineering
Research Laboratories (USA-CERL), starting in the early 1980s, cre-
ated the tool. With the advent of the twenty-first century, the project
came under a steering committee and involves a multinational team of
developers.
GRASS GIS capabilities include
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• Raster analysis: Automatic rasterline and area to vector conversion,
buering of line structures, cell and prole data query, colortable
modications, conversion to vector and point data format, correla-
tion/covariance analysis, expert system analysis, map algebra (map
calculator), interpolation for missing values, neighborhood matrix
analysis, raster overlay with or without weight, reclassi ...