the normalized difference vegetation index (ndvi) derived from the spot 4 satellite has been widely used to monitor moisture-related vegetation condition. the relationship between vegetation and climate index, however, is complex and has not been adequately studied with satellite sensor data. to better understand this relationship, an analysis was conducted on time series of monthly ndvi (1999–...

abstract spi is based on fitting a gamma distribution to precipitation amounts in selected periods. based on current research, the gamma distribution may not be fitted to annual precipitation of some regions. in order to evaluate this subject, annual precipitation have been used during 1958- 2007 at 11 synoptic stations in iran. in first step, values of spi and frequency of different classes of...

Drought is a natural occurrence that has far-reaching and important consequences for the global economy, environment, industry, communities. In recent years, drought-like conditions have emerged in Nagaland as result of insufficient rains climate change, notably farmers, who faced worm-infested crops dried-up fields waterways. Therefore, quantitative examination drought condition vital early de...

[1] Many current metrics of drought are derived solely from analyses of climate variables such as precipitation and temperature. Drought is clearly a consequence of climate anomalies, as well as of human water use practices, but many impacts to society are more directly related to hydrologic conditions resulting from these two factors. Modern hydrology models can provide a valuable counterpart ...

The ever-increasing need for water, the alteration in climate, and its observed changes over recent years have triggered a lot of research studies associated with phenomenon drought. Within wider geographical region Mediterranean, relevant scientific subject seems to be great interest, since it is undoubtedly related number severe socio-economic consequences. This present effort focuses on evol...

Global warming has resulted in increasingly frequent and severe drought and/or precipitation events. Severe drought limits crop water availability and impacts agricultural productivity and socioeconomic development. To quantify drought-induced yield loss during the main crop stages in Liaoning province, China, aspects of drought episodes (magnitude, duration, and frequency) were investigated du...