GDA (Geologic Data Assistant) is an extension to ArcPad, a mobile mapping software program by Environmental Systems Research Institute (ESRI) designed to run on personal digital assistant (PDA) computers. GDA and ArcPad allow a PDA to replace the paper notebook and field map traditionally used for geologic mapping. GDA allows easy collection of field data.
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USGS Numbered Series
GDA (Geologic Data Assistant), an ArcPad extension for geologic mapping: code, prerequisites, and instructions
Pacific Northwest Geologic Mapping and Urban Hazards