Title :
Understanding ERS InSAR coherence of boreal forests
Author :
Askne, Jan ; Dammert, Patrik B G ; Smith, Gary
Author_Institution :
Dept. of Radio & Space Sci., Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
The authors discuss some of the physical mechanisms which determine the repeat-pass coherence of forests in ERS interferograms. It is suggested that the decrease of coherence with increasing stem volume is due to a decreasing forest transmissivity which in turn is determined mainly by gaps between trees. Coherent effects are important for long baselines and is easily included in the model. Weather has a large influence on measurements and generally the forest ground is more affected than the forest canopies
Keywords :
forestry; geophysical techniques; remote sensing by radar; spaceborne radar; synthetic aperture radar; vegetation mapping; ERS; ERS interferogram; InSAR coherence; boreal forest; forestry; gaps; geophysical measurement technique; interferometric SAR; land surface; physical mechanism; radar remote sensing; repeat-pass coherence; spaceborne radar; synthetic aperture radar; transmissivity; tree gap; vegetation mapping; Area measurement; Attenuation; Backscatter; Difference equations; Needles; Phase estimation; Synthetic aperture radar interferometry; Testing; Vegetation mapping; Volume measurement;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1999. IGARSS '99 Proceedings. IEEE 1999 International
Conference_Location :
Hamburg
Print_ISBN :
0-7803-5207-6
DOI :
10.1109/IGARSS.1999.775047
