Et Estimation Method for Different Crops in Irrigated Area Based on Canopy Temperature Difference and Remote Sensing Information

Abstract

The invention relates to a method for estimating ET of different crops in irrigation areas based on canopy temperature difference and remote sensing information, the steps of which are: to calibrate and determine the characteristic parameters a and b of the S-I model based on at least two years of typical farmland detailed experimental historical observation data , to obtain a reliable and accurate calibrated S‑I model; using the Landsat and MODIS remote sensing image data during the crop growth period in the irrigated area, the enhanced spatiotemporal adaptive fusion algorithm is used to fuse the Landsat7 and MODIS data to obtain a daily 30m space during the crop growth period in the irrigated area resolution LST dataset; LST is the surface temperature; combined with the conventional observation data of the local meteorological bureau to obtain the distribution of field net radiation Rn and air temperature Ta in the region, using the calibrated S-I model, the LST dataset with high spatial resolution Based on , estimate the regional crop ET. The invention can quickly and accurately estimate regional crop ET, thereby providing timely and accurate data for agricultural irrigation management in irrigation areas.

Description

technical field [0001] The invention relates to a method for estimating crop ET, in particular to a method for estimating ET (evapotranspiration) of different crops in an irrigation area based on canopy temperature difference and remote sensing information. Background technique [0002] With the acceleration of the urbanization process in our country, the rural labor force gradually transfers to the secondary and tertiary industries in the city; the large loss of rural labor force makes it difficult to continue the traditional agricultural management mode of one household, and the intensive agricultural management has become an inevitable trend of modern agricultural development. Agricultural irrigation has gradually shifted from single, fragmented and small farmlands to contiguous, large farms. China is a country seriously short of water resources, and the contradiction between supply and demand of water resources is still the main bottleneck of sustainable development, and...

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Problems solved by technology

Since then, many scholars have used this method to verify and apply it, but they are all at the field scale and have not been tested and applied at a larger scale.

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