Tools and methods
Step-1: Satellite based inundation surface (area) was estimated through Sentinel-1 radar image obtained from ICIMOD. The digital satellite image was processed to eliminate forest area and permanent water bodies. The final satellite map was then overlaid with population density to estimate population residing in the inundated areas.
Step-2: Product from step 1 was triangulated through the information received from the field (NRCS, DDRC, WFP field staff and others). This formed the base map to proceed with further estimation.
Step-3: Wasting prevalence was overlaid on the base model received from step-2. This provided further refined information on acutely food insecure population by VDCs (where, how many) with severity (priority 1, 2, and 3 for food assistance).
Step-4: Food poverty prevalence was overlaid on the base model received from step-2. This provided the information on chronically food insecure population affected by flood.