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Area and Distance Calculations
Benchmark staff calculate areas and distances using ArcView® software. Areas and distances are calculated using geo-referenced aerial photographs; topographic maps, and field data. Data collected in the field with a Global Positioning System is downloaded by GIS staff and used to plot sample stations, sampling areas, and habitat boundaries. Plotted data are used to calculate areas and distances required for the particular study.
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Study Area Maps and Geo-referenced Aerial Photographs
 GIS staff use a variety of sources to create study area maps and report figures for individual studies. Benchmark staff use USGS maps, FEMA maps, NWI Maps, and geo-referenced aerial photographs. Maps that designate study area location, hospital location, topography, NWI boundaries, soil classifications, and water depths can be produced for most study areas throughout the United States.
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Vegetation Community Mapping
Vegetation community maps are produced when conducting wetland delineations, wetland monitoring, and habitat mapping studies. Interpretive habitat maps can be produced prior to a field study using recent aerial photographs of the study area. Benchmark staff will field validate the interpretive maps using a Global Positioning System. The field data are downloaded into ArcView® software and vegetative community boundaries are plotted on area maps or aerial photographs. Vegetative community maps are an important part of wetland delineation.
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Last Updated ( Tuesday, 24 June 2008 )
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