Drought monitoring method based on HJ-1A/1B CCD data

Abstract

The invention discloses a drought monitoring method. The drought monitoring method comprises the steps that (1) crop cultivation distribution information in a monitored area is obtained; (2) an MPDI mathematic model is built based on HJ-1A / 1B CCD data, a mathematic model between MPDI and soil water content is built, and MPDI data threshold values, at all degrees of drought, of crops are determined according to soil water threshold values, at all degrees of drought, of the crops; (3) a growth model of the crops is introduced, assimilation is conducted on the growth model of the crops and the HJ-1A / 1B CCD data, and the period of duration of the crops is determined; (4) according to the period of duration of the crops in the monitored area, the MPDI data of the crops in the period of duration of the crops and the MPDI data threshold values, at all degrees of drought, of the crops, the drought degree of the crops in the monitored area is obtained, and the drought situation of the crops in the period of duration is judged according to the level of sensitivity of the crops to water in the period of duration. Corresponding drought control measures can be accurately and accordingly adopted according to the drought situation of the crops in the period of duration.

Description

technical field [0001] The invention relates to an agricultural drought monitoring method, in particular to a drought monitoring method based on HJ-1A / 1B CCD data. Background technique [0002] The occurrence process of drought is latent and not easy to find, and in recent years, drought has shown the characteristics of wide occurrence, high frequency, and long duration; the occurrence of farmland drought is characterized by a large impact range and serious catastrophic Consequences and economic losses; study and evaluate the process of drought occurrence and development, and take corresponding measures to combat drought, prevent and reduce disasters, and reduce losses from agricultural disasters. [0003] With its dynamic, real-time, macroscopic and cheap advantages, remote sensing makes it possible to monitor and evaluate drought conditions in a large area, and has become an important development direction in the field of drought monitoring. Remote sensing drought monitor...

AI Technical Summary

Problems solved by technology

However, different growth stages of crops have different sensitivity to water stress. Under the same soil moisture conditions, crops at different growth stages show different drought conditions. Therefore, it is difficult to monitor drought only by relying on HJ-1A / 1B CCD data. It is difficult to take relatively accurate and effective measures against drought

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