Airborne SAR monitoring of tree growth in a coniferous plantation
نویسنده
چکیده
This paper examines three empirically based methods of monitoring forest growth between 1991 and 2000 from airborne synthetic aperture radar (SAR). In the first method, height change and volume change between 1991 and 2000 were estimated from the mean L-band stand backscatter difference between the two dates. Height change and volume change over the nine year period were estimated with an accuracy of 0.23m and 15m 3 /ha respectively, when the stands were below saturation point for the first date. The accuracy of the results was lower for stands beyond saturation in both data sets. In the second method, height change is calculated from estimated stand height in 2000 minus estimated stand height in 1991. The second method produced poorer results than the first method, but better results than predicted by the error propagation equation. The difference between the observed accuracy and the expected error (based on the error propagation equation) appears to be due to a systematic bias in both the 1991 and 2000 estimates, as the residuals are correlated for stands below 20 years old (r=0.71 for stand volume residuals). The third experiment investigates the utility of data from two dates to classify the stands into three age classes. The results show that, with two images separated by nine years, 85% of stands were correctly classified compared to 69% for a single date L-HV image.
منابع مشابه
Soil changes induced by hardwood and coniferous tree plantations establishment: Comparison with natural forest soil at Berenjestanak lowland forest in north of Iran
Increasing urbanisation and industrialisation have led to a dramatic reduction in forest area, and now only culturally protected remnants of natural forests and some new plantations remain in most areas of the north of Iran. To investigate the status of the chemical and physical characteristics of soil under these remnant forests and assess the possible impacts of reforestation on soil properti...
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متن کاملSoil changes induced by hardwood and coniferous tree plantations establishment: Comparison with natural forest soil at Berenjestanak lowland forest in north of Iran
Increasing urbanisation and industrialisation have led to a dramatic reduction in forest area, and now only culturally protected remnants of natural forests and some new plantations remain in most areas of the north of Iran. To investigate the status of the chemical and physical characteristics of soil under these remnant forests and assess the possible impacts of reforestation on soil properti...
متن کاملSoil changes induced by hardwood and coniferous tree plantations establishment: Comparison with natural forest soil at Berenjestanak lowland forest in north of Iran
Increasing urbanisation and industrialisation have led to a dramatic reduction in forest area, and now only culturally protected remnants of natural forests and some new plantations remain in most areas of the north of Iran. To investigate the status of the chemical and physical characteristics of soil under these remnant forests and assess the possible impacts of reforestation on soil properti...
متن کاملSoil changes induced by hardwood and coniferous tree plantations establishment: Comparison with natural forest soil at Berenjestanak lowland forest in north of Iran
Increasing urbanisation and industrialisation have led to a dramatic reduction in forest area, and now only culturally protected remnants of natural forests and some new plantations remain in most areas of the north of Iran. To investigate the status of the chemical and physical characteristics of soil under these remnant forests and assess the possible impacts of reforestation on soil properti...
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تاریخ انتشار 2009