Envisat Advanced Synthetic Aperture Radar （ASAR） dual-polarization data are shown to be effective for regional forest monitoring. To this scope

an automatic SAR image preprocessing procedure was developed using SRTM DEM and Land-sat TM image for geocoding in rugged terrain and smooth terrain areas

respectively. An object-oriented forest and non-forest classification method was then proposed based on the HH （horizontal transmit and horizontal receive） to HV （horizontal transmit and vertical receive） polarization intensity ratio and HV images ofASAR data at single acquisition time in winter. The developed method was applied to forest and non-forest mapping in Northeast China. The overall accuracy

the user’s accuracy and the producer’s accuracy of forest were 83.7%

85.6% and 75.7%

respectively. These results indicate that the proposed method is prom- ising for operational forest mapping at regional scale.