Forest areas can be easily traced from low resolution landsat imagery. It is thus possible to locate 100% of forest areas with the available satellite imagery.
The National Remote Sensing Center has released the Landuse/Lancover data for India at a scale of 1:1 million into the public domain. The dataset is available as a WMS server which can be loaded into [JOSM]
Usage instructions: http://firstname.lastname@example.org/msg01449.html
Note: Agricultural areas may also look deceptively similar to wooded areas in low res imagery, however if you look closely you can see noisy patterns showing human activity.
- Forest Surey of India
- Tiger Reserves - FSI
- [http://www.indiatravelplus.com/wildlife/wildlife-maps-india.html Wildlife maps of India (rough overview)