Agricultural drought monitoring method based on SMAP L waveband brightness temperature

A drought and brightness temperature technology, applied in the field of drought monitoring, can solve the problems of poor inversion accuracy, low penetration depth of microwave brightness temperature, affecting soil moisture inversion accuracy, etc., and achieve the effect of avoiding the uncertainty of accuracy.
CN112730465AActive Publication Date: 2021-04-30POWERCHINA HUADONG ENG COPORATION LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
POWERCHINA HUADONG ENG COPORATION LTD
Publication Date
2021-04-30

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Abstract

The invention discloses an agricultural drought monitoring method based on an SMAP L waveband brightness temperature, and the method employs the soil moisture, soil temperature and vegetation information carried in the L waveband brightness temperature to represent a drought state, builds a standardized microwave brightness temperature drought index (SMTBDI). The method is a quick, convenient and near-real-time monitoring method. And agricultural drought can be effectively forecasted and early warned. The method comprises the following steps: acquiring SMAP brightness temperature time series data of each grid in a certain time scale of a month for many years in an area; performing Gaussian distribution inspection on the time sequence data, and judging whether an independent sample corresponding to each grid conforms to Gaussian distribution or not; calculating SMTBDI for the grid passing through the Gaussian distribution test; and judging the drought degree according to the SMTBDI score, wherein the smaller the index value is, the more drought the index value is.
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Description

technical field

[0001] The invention belongs to the technical field of drought monitoring, in particular, a drought monitoring method based on SMAP L-band brightness temperature is invented. This method uses the soil moisture, soil temperature and vegetation information carried in the L-band brightness temperature to characterize the drought state, and constructs the Standardized Microwave brightness temperature drought index (SMTBDI), which is a fast, convenient and near real-time monitoring method. This method can effectively forecast and warn agricultural drought. Background technique

[0002] Soil moisture is an important data source for agricultural drought monitoring. The lack of soil moisture caused by lack of rainfall will prevent plants from absorbing sufficient water, and the healthy growth of plants will be threatened. Therefore, soil moisture, as the first sign of drought, is a key and timely monitoring indicator. Among the soil moisture products, the microwav...

Claims

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