GPS technology is an advanced tool for updating
GIS database and to create new themes with required spatial accuracy.
It is being used for ground truthing and surveys. All the field
executives are using GPS for accurate surveying. This technology
has been adopted by APFD very intimately than any other technology.
There are two types of instruments procured by the department for
different purposes. The Hand held GPS sets were purchased for navigation
in ground truthing of Image classification and surveys of plantations
and VSS areas.
The DGPS system (24 Rovers - 3 Base stations) were
purchased for carrying out accurate surveys of plantations, VSS
treatment area surveys , Forest Block Surveys and being used for
leveling. Projection conversion parameters were also developed for
using the Rovers and Hand held sets from WGS to Indian Geodetic
Systems and were uploaded into data loggers for use in real time
survey (Navigation) and updation of existing vector themes.