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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Retrieval and Validation of Sea Ice Concentration from AMSR-E/AMSR2 in Polar Regions
摘要： Sea ice concentration (SIC) is an important sea ice parameter of the atmosphere-ice-ocean system in the polar region. Daily 6.25 km AMSR-E/AMSR2 SIC from Bremen University (UB) is one of the widely used SIC products. In this paper, MODIS data and aerial image are used to validate this product. The results show that the daily mean AMSR-E ASI products underestimate SICs about 17.9% based on the aerial image, and underestimate SICs about8.5% based on MODIS image. The sea ice extent (SIE) and sea ice area (SIA) which are derived from SIC by ASI algorithm, Dynamic Tie-point ASI algorithm (DT-ASI) as well as NT algorithm are compared.
关键词： Retrieval,Validation,aerial image,Sea ice concentration,AMSR-E,MODIS
更新于2025-09-23 15:22:29
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Frequency-Dependence of Vegetation Optical Depth-Derived Isohydriciy Estimates
摘要： Passive microwave radiometry-derived vegetation optical depth measurements can be used to map how different ecosystems are sensitive to drought. This is quantified using the plant physiological concept of isohydricity. VOD-derived effective ecosystem-scale isohydricity maps have recently become commonly used, but their sensitivity to the underlying VOD datasets is not yet well understood. In this work, the dependence of the isohydricity calculation on assumptions about canopy cover penetration - which depends on frequency - and observation time - which varies by sensor in a manner roughly consistent with the observation frequency - are reviewed, and isohydricity datasets from different VOD datasets are compared and validated.
关键词： SMAP,AMSR-E,Isohydricity,vegetation optical depth
更新于2025-09-23 15:21:01