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

A HJ-1A, data technology, applied in measurement devices, material analysis by optical means, instruments, etc., can solve the problems of difficulty in taking accurate and effective drought control measures, and different sensitivity levels.

Inactive Publication Date: 2015-04-29
SOUTH CHINA AGRI UNIV
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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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  • Drought monitoring method based on HJ-1A/1B CCD data
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  • Drought monitoring method based on HJ-1A/1B CCD data

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Embodiment

[0046] Such as figure 1 As shown, this embodiment discloses a drought monitoring method based on HJ-1A / 1B CCD data, to realize the optimal allocation of agricultural water resources and the drought warning within the monitoring area, specifically including the following steps:

[0047] (1) Obtain the crop planting distribution information in the monitoring area, and the crop planting distribution information refers to the spatial distribution of the crops; in the present embodiment, the monitoring area is Leizhou Peninsula, Guangdong Province, and the crop is sugarcane, wherein the method for obtaining the crop planting distribution information is as follows:

[0048] (1-1) Select a pure sugarcane crop planting area, use handheld GPS to determine the boundary of the selected area, and vectorize the boundary data as a training sample area,

[0049] (1-2) Using geographic information data, according to the boundaries of administrative regions, the administrative regions that do ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/84
Inventor 李就好陈海波余长洪张连宽姜俊红陈凯刘德灿
Owner SOUTH CHINA AGRI UNIV
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