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AWiFS based Land Use/Cover Map from NRSC/ISRO Contributes to Unified Global Crop Land Map (2014)
Global Food Security, Crop Monitoring and Forecasting Applications of Earth Observation require a reliable global map of crop land. In past two decades a number of global land use / cover maps have been generated.
Recently, Waldner et al (2016) have synthesized a unified crop land layer information at 250m resolution for which various global and regional land cover data sets prepared have been integrated. The global land cover maps from nearly 80 land use / cover maps from 49 sources prepared for time periods ranging from 1990 to 2014 have been integrated. The land use / cover maps prepared during 2004 time period by NRSC/ISRO under National land use and cover mapping using multi-temporal AWiFS data (LULC-AWiFS) has been used to represent Indian crop land cover.
The regional input maps were aggregated to global level using weighted criterion approach with criteria namely, the adequacy of the current legend, the adequacy of the spatial resolution, the timeliness and the confidence level.
The validation data sets were collected through open and crowd sourcing data collection mechanisms like geoWiki crowd-sourcing campaign. Validation of this unified global land cover with three validation data sets resulted in overall accuracies ranging from 82% to 95% thus the unification process has successfully improved the accuracy of global land use / cover product compared to single global products.