摘要: This work investigated the temporal monitoring of savanna ('cerrado') vegetation phenology in Emas National Park Brazil utilizing 1.1 km full resolution daily images Advanced Very High Resolution Radiometer (AVHRR) on-board NOAA-11 satellite. For a period 18 months studied 1992-93, only 26 had useful data. Digital analysis individual concentrated on five sub-areas up to 30 km2 each. Channels used were 1 (0.6-0.7 mu m), 2 (0.7-1.1 m) and 3 (3.5-3.9 as well Vegetation Index (NDVI) which combines channels 2. A high Thematic Mapper (TM) Landsat image field provided ground data identify types. Channel NDVI showed strongest response phenological changes vegetation, while presented dependence off-nadir scan angle. The results indicated large variations AVHRR signal for same area, regardless changes. Re...
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