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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Folkesson, K. Smith-Jonforsen, G. Ulander, L.M.H. |
| Copyright Year | 1980 |
| Abstract | A limiting factor that has been identified for stem-volume retrieval in coniferous forests using VHF synthetic aperture radar is that the backscatter varies depending on ground topography. On sloping ground, the backscatter from a forest is reduced, since the dominant ground-trunk double-bounce scattering mechanism is changed. This leads to underestimation of stem volume, and the variations caused by topography can obscure real variations in stem volume. By using multiple images acquired with different flight headings and combining the image information with ground-topography data in a model-based inversion method, we are able to compensate for the ground-topography influence on the backscatter. The inversion method is based on image segmentation and the optimal estimation method. Using four or more images from the CARABAS-II system and a coarse digital elevation model with 50-m horizontal grid, the stem volume can be retrieved with an average root-mean-square error (rmse) of less than 60 m3 ha-1 for stem volumes in range of 80-700 m3 ha-1 (in terms of above-ground biomass, this is equivalent to an rmse of less than 40 ton ldr ha-1 over the range of 50-400 ton ldr ha-1). The retrieval accuracy is similar to that previously obtained for similar forests standing on flat and horizontal ground. |
| Sponsorship | IEEE Geoscience and Remote Sensing Society IEEE URSI |
| Starting Page | 1045 |
| Ending Page | 1055 |
| Page Count | 11 |
| File Size | 834450 |
| File Format | |
| ISSN | 01962892 |
| Volume Number | 47 |
| Issue Number | 4 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2009-04-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Image retrieval Backscatter Space technology Biomass Synthetic aperture radar Volume measurement Surfaces Optical scattering Image segmentation Radar scattering VHF radar Forestry image segmentation synthetic aperture radar (SAR) VHF measurements |
| Content Type | Text |
| Resource Type | Article |
| Subject | Earth and Planetary Sciences Electrical and Electronic Engineering |
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