Geographic Information Systems
Geographic Information Systems (GIS) have redefined mapping. At PTA data from the GPS are downloaded daily into the GIS for electronic tracking of the survey progress and findings. Maps generated with the GPS data also enable key personnel to examine survey coverage and determine if areas require more attention. Discriminating positive shovel tests from negative units enables supervisors to plan for more efficient use of recording time, predict density in unsurveyed areas, and obtain a preliminary assessment of site distribution.