Large-area farmland crop water status monitoring method and system based on unmanned aerial vehicle infrared thermal image acquisition

Abstract

The invention provides a large-area farmland crop water status monitoring method based on unmanned aerial vehicle infrared thermal image acquisition. The method comprises the following steps: 1)arranging auxiliary devices in the field, that is, field air temperature sensors and a ground full-evaporation reference surface; 2) carrying out large-area infrared image acquisition on farmland corps through an infrared thermal imaging system fixed to an unmanned aerial vehicle through a pan-tilt, and synchronously triggering a GPS module to obtain positioning information of the corresponding images; and 3) receiving by a ground data processing system the infrared images and the positioning information, carrying out image registering, splicing and segmentation on the images, extracting spatial distribution of canopy temperature and ground full-evaporation reference surface temperature, calculating the temperature of leaves when the stomas of the crops are fully closed, and finally, calculating water deficit index of the crops and carrying out highlighted display and early warning on the areas, where the water deficit index of the crops is higher than a critical value. Besides, the invention also provides a system suitable for the method. The method and system are suitable for large-area farmland crop water status monitoring, facilitate to realize agriculture precision irrigation and improve agricultural modernization level.

Description

technical field [0001] The invention relates to the technical field of agricultural irrigation, in particular to a method and system for monitoring the water state of large-area farmland crops based on infrared thermal image acquisition. Background technique [0002] There are many methods for monitoring the moisture status of farmland crops, mainly including monitoring based on soil moisture (or water potential) and crop physiological growth indicators, and very few monitoring through meteorological indicators. Indexes based on the response of crops to water drops are generally considered to better reflect the water deficit of crops, and there are many applications, such as leaf moisture content, leaf water potential, stem diameter change, stomatal conductance, cell change, leaf temperature difference etc. These generally require the use of specific instruments, and usually can only provide information on individual plants or individual leaves. Considering the large spatial...

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Problems solved by technology

Indexes based on the response of crops to water drops are generally considered to better reflect the water deficit of crops, and there are many applications, such as leaf moisture content, leaf water potential, stem diameter change, stomatal conductance, cell change, leaf temperature difference etc. These generally require the use of specific instruments, and usually can only provide information on individual plants or individual leaves. Considering the large spatial variability of these indicators in the field, there are certain difficulties in application

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