کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5754878 | 1621208 | 2017 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Biomass and InSAR height relationship in a dense tropical forest
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
کامپیوتر در علوم زمین
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چکیده انگلیسی
In the present study we applied X-band interferometric SAR (InSAR) data from the TanDEM-X mission, and investigated the relationship between InSAR height above ground and above-ground biomass (AGB) in a forest with very high biomass. We carried out this study in the East Usambara Mountains in Tanzania, with AGB ranging up to >Â 1000Â t/ha. Field inventory provided AGB data for 153 plots of 900Â m2 in size. An airborne laser scanning (ALS) provided a DTM as well as AGB predictions for larger 8100Â m2 cells over the entire study area. Three TanDEM-X acquisitions provided single-pass InSAR data, from which we generated a Digital Surface Models (DSM) and InSAR height by subtracting the ALS DTM. The results showed that proportionality may represent the relationship where AGB increased with 18.4Â t/ha per m increase in InSAR height. The accuracy was low with RMSEÂ =Â 203Â t/ha (44%), which was partly attributable to small field plots and partly to a limited sensitivity of InSAR height to variations in basal area and stand density. An identical proportionality model, with less residual noise, was achieved by replacing the small field plots with the 8100Â m2 cells having AGB predictions from ALS data.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Remote Sensing of Environment - Volume 192, April 2017, Pages 166-175
Journal: Remote Sensing of Environment - Volume 192, April 2017, Pages 166-175
نویسندگان
Svein Solberg, Endre Hofstad Hansen, Terje Gobakken, Erik Næssset, Eliakimu Zahabu,