Evaluation of Satellite and Vegetation Indices in Drought Monitoring
Natural, very complex phenomena drought is a disaster with impact on the economy, agriculture, human activities, wildlife and the overall on vegetation. Large-scale droughts in recent years have been found in all continents. Drought index obtained from meteorological data, have not good temporal and spatial resolution. These indicators have not good accuracy and can be used only for a specific area. Moreover, these indicators cannot be updated drought monitor. Remote sensing data provided an appropriate regulatory tool to assess the severity of drought. Growth rate of vegetation is one of the most important indicators of the occurrence of drought. In this study, the evaluation of a number of plant parameters is presented and finally, the NDVI index has been chosen as a suitable index for the vegetation. After introducing several drought indicators such as VCI, TCI, VHI and the DSI will be extracted from satellite images, have been studied.E of these indicators can be used in a specific time and place.
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