Pine forest investigation using high resolution P-band Pol-InSAR data |
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Authors: | Franck Garestier Pascale Dubois-Fernandez Thuy Le Toan |
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Affiliation: | a Lab M2C, Université de Caen-Basse Normandie, UMR CNRS/INSU 6143, 2-4 rue des Tilleuls F-14000 Caen, Franceb ONERA, DEMR/RIM, BA 701, 13661 Salon AIR, Francec INRA, Unité de Recherche 1263 EPHYSE, Centre de Bordeaux, BP 81, 33883 Villenave d'Ornon Cedex, Franced CESBIO, 18, av. Edouard Belin, bpi 2801, 31401 Toulouse cedex 9, France |
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Abstract: | A Pol-InSAR dataset acquired at P-band over a maritime pine forest (Nezer forest of Landes, France) has been investigated and compared with tree structural ground measurements in order to identify scatterers associated with elementary scattering mechanisms in the canopy layer. Since this managed forest is constituted by different height stands, it allows to investigate mechanism change in the vertical direction during the forest growth. It has been observed that VV channel was the most elevated, which can be accounted for a maximum attenuation in the vertical direction and partially for the presence of sub-vertical branches in the top canopy layer, and that this channel was the most sensitive to the tree density in reason of an important ground reflectivity. The most pure double-bounce scattering mechanism component is received in HH-VV channel where the corresponding phase center reaches the ground level for large Diameter at Breast Height. It is also supposed that HH channel, which receives double bounce backscatter, was affected by the sub-horizontal primary branch development, which induces an elevation of the phase center over oldest trees while tree density diminution enhances backscatter from the ground level. Finally, the crosspolar channel appeared the less perturbed by the tree density than VV channel since it receives predominantly the canopy contribution. |
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Keywords: | SAR Polarimetry Interferometry Forestry |
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