These files need to be transfered from Trimble Office.
Text file (ex. exp1119a)
Shape file (ex. Lin_gen.shp)
Data Base File (ex. Lin_gen.dbf)
Propriatary file (ex.Lin_gen.shx)
Trimbles 560 page Geo XH Manual (.pdf)
Some of the layers that are available for our project (the "Data Dictionary").A Geographic Information System for Water Flow and Land Use in the Waimanalo Stream Drainage Basin (.pdf)
More information about TeraSync software from Trimble
Pictures of GIS Sunday
Differential Correction removes satellite timing errors, receiver timing errors, and atmospheric errors. An uncorrected signal is accurate to 7-8 meters or about 25-30 feet. There are two differential correction methods: postprocessing (above) and real-time (below.) The concept is the same. A base station is surveyed to 1-3cm accuracy. When the satellite signals reaches a base station, the base station recognizes the difference between its accurate surveyed position and the error position sent by the satellites. The correction is either saved to a hard disk for postprocessing or communicated real-time to the GPS receiver. .Real-time is valuable for navigation. Postprocessing is more accurate.