pptpresentation-codata,thecommitteeondataforscience.pptVIP

pptpresentation-codata,thecommitteeondataforscience.ppt

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pptpresentation-codata,thecommitteeondataforscience

* NDVI wrap-up * Landcover Full Year Growing Season Dormancy Season Green-up Season    Day001-353 Day113-273 Day001-097, 289-353 Day113-145 Needle leaf-Evergreen 6929 7716 6208 7088 Needle leaf- Deciduous 4600 6704 2671 5756 Broad leaf- Deciduous 5354 7717 3187 7353 Nixed forest 5965 7615 4453 6918 Bush and sparse forest 3836 5422 2383 3924 Meadow grassland (South) 4531 6478 2747 4827 Meadow grassland (North) 3326 5423 1404 4066 Typical grassland 2597 4494 858 2587 Sparse grassland 2291 2909 1725 1913 Bare land / sand 1586 1825 1367 1657 Rain-fed cropland 3331 4864 1926 2557 Irrigated cropland 3413 5504 1496 2280 City and town 1955 2623 1343 2200 Water body -807 -1117 -524 -1032 Average NDVI of Major Land Covers (10000*NDVI) * (2) Additional information From MODIS-NDWI: Irrigated vs. Non-irrigated (1) Before Day145, all croplands have the similar signature as soil, NDVI 0.25-0.3;during Day145-209, NDVI can be 0.7-0.99; (2) The NDVI difference between Irrigated and non-irrigated crop land exists, but not reliable for classification (3) The signature from WATER can be best described with NDWI. * Irrigated (left) vs Rain-fed ( right) NDVI NDWI * Most sensitive period of NDWI: Day129-161 More information from other indices, DEM … * 5.Decision Tree * (2)、Node and Decision Rules (Indices) Step 1-2:Water and City, from 1:100,000 landuse map, IGSNRR,CAS. Step 3-5:growing season (day113 -273 ) If NDVI day113 -273 0.30 then ‘bare soil’ If NDVI day113 -273 = 0.30-0.35 then ‘Sparce grass’ If NDVI day113 -273 = 0.35-0.45 then ‘Typical grass’ Step 6:If NDVIday145 ≤ 0.4 then ‘crop land’ Step 7:If NDWIday129-145sum 0.05 and DEM500 then ‘irrigated’ Step 8: If NDVIday113-2730.65 then ‘forest’ Step 9: If NDVIdormancy 0.53 then ‘forest-evergreen’ Step 10: If NDVIdormancy =0.38-0.53 then ‘forest-mixed’ else ‘forest-deciduous’ Step 11:If NDWIday97-1290 then ‘f

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