Method of acquiring all-weather evapotranspiration by combining remote sensing and meteorological data
A technology of meteorological data and remote sensing data, applied in the field of remote sensing, can solve problems such as not being able to obtain all-weather evapotranspiration
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Embodiment 1
[0106] Taking Henan Province as the research area, figure 2 It is the meteorological data of the study area at 10:00 on April 29, 2015 cut out after downloading the CLDAS grid meteorological data. image 3 is the MODIS Land Surface Temperature (LST) product for the same day, from image 3 It can be seen that on this day, many places, especially the eastern region, showed large white blank areas due to the influence of unfavorable factors such as clouds. There was no normal temperature value, and the temperature was discontinuous. These places could not normally use remote sensing methods to reflect Therefore, traditional remote sensing inversion methods cannot be used to obtain all-weather evapotranspiration. Figure 4 is the result of evapotranspiration inversion. It can be seen from the figure that the traditional method is helpless in the place where there is no pixel value, and cannot obtain evapotranspiration; the method of the present invention can effectively make up...
Embodiment 2
[0108] Taking Henan Province as the research area, Figure 5 It is the meteorological data of the study area at 10:00 on May 12, 2015, which was cut out after downloading the CLDAS grid meteorological data. Figure 6 It is the MODIS data of the day. It can be seen from the figure that some areas in the central part of Henan are blank and valueless areas. Figure 7 is the result of evapotranspiration inversion. Figure 7 (a) is the inversion result of the traditional remote sensing method. It can be seen from the figure that the traditional method cannot obtain evapotranspiration where there is no pixel value; Figure 7 (b) is the result of the method of the present invention.
[0109] It can be seen from the results of Example 2 that the method of the present invention can effectively make up for the problem that traditional optical and thermal infrared remote sensing cannot invert evapotranspiration due to unfavorable meteorological factors such as clouds, and can realize a...
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