Redlands, California—Subsequent to Cyclone Nargis, a category 3 tropical storm that struck the low-lying and heavily populated coastline of Myanmar on May 2, 2008, the Foreign Agriculture Service (FAS) of the U.S. Department of Agriculture (USDA) began producing a series of geographic information system (GIS)-based maps of the damaged agricultural areas to accompany its commodity intelligence reports.
Published on the FAS Web site, these maps are created using geospatial data and the technology found in ESRI’s ArcGIS Desktop software.
The mission of FAS is to improve foreign market access to U.S. agricultural products, build new markets, improve the competitive position of U.S. agriculture in the global marketplace, and provide food aid and technical assistance to foreign countries. FAS achieves a part of this mission by analyzing global crop production capacity with remote-sensing and GIS tools and by issuing commodity intelligence reports highlighting current international crop conditions. GIS-based maps, available in PDF format, provide a visualization of the analysis performed and often serve as each report’s basis. The commodity intelligence reports issued for the country formerly known as Burma focus on Myanmar’s major rice-producing areas, which have suffered saltwater flooding and heavy rainfall as a result of the cyclone.
The project included satellite imagery obtained from the National Aeronautics and Space Administration’s (NASA) moderate-resolution imaging spectroradiometer (MODIS) satellite to delineate the postcyclone flooding region. This imagery was combined with rice land-cover classification data from the Landsat satellite program. FAS used ArcGIS to perform spatial analysis and create maps of the damaged rice production regions of Myanmar. These maps revealed the cyclone’s effect on cropland and livestock, the severity of flooding, and the rate of cropland recovery. The United Nations and nongovernmental organizations (NGO) are using the maps to evaluate the scope of the cyclone’s impact. The information is also been of great interest to the international agriculture industry for determining market impacts.
“Our GIS maps and flood classification data show that the areas originally inundated by the storm account for approximately 1.7 million hectares of rice, 24 percent of the national rice area, or roughly 2.5 million tons of rice production on a milled basis,” says FAS international crop assessment analyst Michael Shean. “The core region most severely damaged by the tidal wave and high winds, however, accounted for approximately 900,000 hectares of rice land, 13 percent of the national rice area, and roughly 1.35 million tons of milled rice production. In addition, field reports from inside the affected region indicate that within these rice production areas, large numbers of villages were destroyed along with much of their food stocks, livestock, and farming supplies.”
A commodity intelligence report and maps issued June 10, 2008, demonstrate that approximately 80 percent of the original inundated rice production area is still affected by some degree of flooding, though conditions in the core damage zone had improved considerably, with only 418,000 hectares, or 46 percent of the original area, still showing flood effects. FAS will continue to produce reports and maps and perform analysis of Myanmar’s rice production regions as new data becomes available.
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