1. Identifying Forest Change with SAR
March 2010
Martin Whittle Shaun Quegan
University of Sheffield

2. Landsat vs. SAR SAR does not suffer from cloud problems Deforestation
2006/09/03
Landsat5
2008/06/20
ALOS PALSAR
The Landsat image above was the best available from the time and emphasises the difficulty of using optical Imagery to develop accurate databases. HH HV
HH/HV
SAR does not
suffer from cloud
problems

3. Temporal ScanSAR image of Kampar region
Jan 2007
Sept 2007
June 2008
Each HH image has been de-noised by
multi-channel filtering.
Pixel size:
100 X 100 m
Image size:
128 X 91.8 Km

4. Detections compared with database deforestation
TP – True positive (correct detection)
FP – False positive (false alarm)
FN – False negative – missed detection