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ABSTRACT: This study used support vector machines to classify multiangle POLDER data. Boreal wetland ecosystems cover an estimated 90 x 10<sup>6</sup> ha, about 36% of global wetlands, and are a major source of trace gases emissions to the atmosphere. Four to 20 percent of the global emission of methane to the atmosphere comes from wetlands north of 40°N latitude. Large uncertainties in emissions exist because of large spatial and temporal variation in the production and consumption of methane. Accurate knowledge of the areal extent of open water and inundated vegetation is critical to estimating magnitudes of trace gas emissions. Improvements in land cover mapping have been sought using physical-modeling approaches, neural networks, and active-microwave, examples that demonstrate the difficulties of separating open water, inundated vegetation and dry upland vegetation. Here we examine the feasibility of using a support vector machine to classify POLDER data representing open water, inundated vegetation and dry upland vegetation.
Geoscience and Remote Sensing Symposium, 2002. IGARSS '02. 2002 IEEE International; 07/2002
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V.C. Vanderbilt, G.L. Perry,
G.P. Livingston,
S.L. Ustin,
M.C. Diax Barrios,
F.-M. Breon,
M.M. Leroy,
J.-Y. Balois,
L.A. Morrissey,
S.R. Shewchuk,
J.A. Stearn,
S.E. Zedler,
J.L. Syder,
S. Bouffies-Cloche,
M. Herman
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ABSTRACT: Inundation is linked to water, carbon, and energy budgets at landscape to global scales. We describe a new remote-sensing technique for identifying inundated areas based on the properties of the glitter-the strong, angular signature reflection that is characteristic of surface water and uncharacteristic of other cover types. We discriminated three cover types-vegetation emergent above inundated soils, open water, and noninundated cover types-from analysis of directional data collected in the red spectral band by the airborne POLDER (Polarization and Directionality of Earth's Reflectance) sensor. We found that values of the normalized difference vegetation index (NDVI) decreased dramatically in the glitter direction, providing an indication of surface water. Application of our new technique holds promise for mapping the seasonal and interannual extent of inundation, a key descriptor of wetlands hydrology.
IEEE Transactions on Geoscience and Remote Sensing 07/2002; · 2.89 Impact Factor
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Journal of Pharmaceutical Sciences 11/1970; 59(10):1448-56. · 3.06 Impact Factor
