Item talk:Q250981
From geokb
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"abstract": "The objective of this study was to investigate the changes in cropland areas as a result of water availability using Moderate Resolution Imaging Spectroradiometer (MODIS) 250 m time-series data and spectral matching techniques (SMTs). The study was conducted in the Krishna River basin in India, a very large river basin with an area of 265 752 km2\u00a0(26 575 200 ha), comparing a water-surplus year (2000\u20132001) and a water-deficit year (2002\u20132003). The MODIS 250\u00a0m time-series data and SMTs were found ideal for agricultural cropland change detection over large areas and provided fuzzy classification accuracies of 61\u2013100% for various land\u2010use classes and 61\u201381% for the rain-fed and irrigated classes. The most mixing change occurred between rain-fed cropland areas and informally irrigated (e.g. groundwater and small reservoir) areas. Hence separation of these two classes was the most difficult. The MODIS 250 m-derived irrigated cropland areas for the districts were highly correlated with the Indian Bureau of Statistics data, with\u00a0R\u00a02-values between 0.82 and 0.86.The change in the net area irrigated was modest, with an irrigated area of 8\u00a0669\u00a0881 ha during the water-surplus year, as compared with 7\u00a0718\u00a0900 ha during the water-deficit year. However, this is quite misleading as most of the major changes occurred in cropping intensity, such as changing from higher intensity to lower intensity (e.g. from double crop to single crop). The changes in cropping intensity of the agricultural cropland areas that took place in the water-deficit year (2002\u20132003) when compared with the water-surplus year (2000\u20132001) in the Krishna basin were: (a) 1\u00a0078\u00a0564 ha changed from double crop to single crop, (b) 1\u00a0461\u00a0177 ha changed from continuous crop to single crop, (c) 704\u00a0172 ha changed from irrigated single crop to fallow and (d) 1\u00a0314\u00a0522 ha changed from minor irrigation (e.g. tanks, small reservoirs) to rain-fed. These are highly significant changes that will have strong impact on food security. Such changes may be expected all over the world in a changing climate.",
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