The Army Geospatial Center (AGC) Environmental Analysis Team conducts Geographic Information System (GIS) based Historical Photographic Analysis (HPA) of current, former, and closing U.S. military installations, training land, and other sites under federal responsibility. HPA are a geographic response to modern day concerns caused by historical activity that require the characterization of land use change over time. Analysts use historical aerial photography, and ancillary data, to reveal or refine potential areas of environmental concern for sites where activity is often obscured today due to the burial of material, rapid revegetation, structural deterioration, or dramatic changes in land use. These temporal or time-based studies provide clues for identifying Hazardous, Toxic, and Radioactive Waste (HTRW), unexploded ordnance (UXO), landfill locations, shoreline changes, and surface features (i.e., rock fractures) that shape the movement of contaminants. HPA allow customers to focus restoration and remediation efforts, resulting in significant cost avoidance.
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