Hello Netters, I am looking for some information on forest monitoring. Surveys in some of the tropical countries (Guinea, Indonesia, Philippines, Colombia) indicate that the scale for forest monitoring purposes can be 1:250.000, with a frequency of about 2 years. I wonder if these figures are valid anymore given the growing concern for tropical forest and given the need for more sustainable management. Could anyone comment or give me some input regarding this aspect? Secondly, given the almost permanent cloud cover i tropical countries, the use of radar remote sensing data and derived information, become evident. Out there on the net is there somebody who could answer the following questions: If we want to distinguish between e.g the following five classes: undisturbed forest, non-forest, disturbed (selective logging forest, disturbed (slash&burn) forest and clear cuts, what radar frequency is required (including polarisation, view angle, radiometric resolution) Is this valid for all tropical regions in the world i.e. South America, Africa and Asia? Did anybody have a look as to what the atmosphere does in P- and L-band data to the polarisation? Did anybody establish a direct link between radar backscatter values and the various types of deforestation? Best Regards, -- Wim Looyen National Aerospace Laboratory NLR Remote Sensing Department P.O. Box 153 8300 AD Emmeloord The Netherlands Tel: 31 5274 8247 Fax: 31 5274 8210 E-mail: looyen@nlr.nl
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