Microwave remote sensing soil moisture product downscaling method based on spatio-temporal information fusion
A soil moisture and downscaling technology, applied in the field of microwave remote sensing, can solve the problems of local regional errors and inconsistency in the spatial distribution of soil moisture, and achieve the effect of improving scientificity.
Active Publication Date: 2021-06-18
自然资源部国土卫星遥感应用中心
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Problems solved by technology
In the above methods, the spatial interpolation method does not consider the factors affecting soil moisture, and simply relies on the spatial distance for weighting, which may cause the spatial distribution of soil moisture to be inconsistent with the actual situation; other methods of introducing auxiliary data mostly use vegetation or soil temperature and other information, using the existing satellite remote sensing vegetation products and temperature products to carry out downscaling work, but did not consider the influence of topography, soil texture and other factors on the spatial distribution of soil moisture, which will cause large errors in local areas, so the auxiliary factor The comprehensiveness still needs to be improved
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Embodiment 1
[0042] Embodiment 1, a method for downscaling microwave remote sensing soil moisture products by fusion of spatiotemporal information, comprising the following steps:
[0043] S1) Constructing the relationship expression model between soil moisture and associated surface parameters; including the following steps:
[0044] S11) Parameterize several surface parameters associated with soil moisture, including vegetation coverage parameters, surface temperature, topographic condition parameters, and soil texture parameters; use soil volumetric water content to represent soil moisture, and use normalized The integrated vegetation index represents the vegetation coverage parameters, uses the surface slope to represent the terrain condition parameters, and uses the soil specific surface area and bulk density to represent the soil texture parameters respectively;
[0045] S12) Acquiring historical data corresponding to several surface parameters associated with soil moisture, ...
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The invention relates to the field of microwave remote sensing, and discloses a microwave remote sensing soil moisture product downscaling method based on spatio-temporal information fusion, which comprises the following steps: constructing a relationship expression model between soil moisture and associated earth surface parameters; performing downscaling on the low-spatial-resolution soil moisture remote sensing product by using correlation parameters with similar time sequences, and performing downscaling on the low-spatial-resolution soil moisture remote sensing product by using correlation parameters with adjacent spaces; and fusing the high-spatial-resolution soil moisture downscaling result of the time sequence auxiliary information and the high-spatial-resolution soil moisture downscaling result of the spatial auxiliary information by using an error weighting method to obtain a high-spatial-resolution soil moisture product downscaling fusion result. According to the method, the earth surface parameters associated with the soil moisture are comprehensively considered, and the passive microwave remote sensing low-spatial-resolution soil moisture product is downscaled by using time sequence similar and spatial adjacent auxiliary information, so that the scientificity, the processing precision and the space-time continuity of the soil moisture downscaling result are improved.
Description
technical field [0001] The invention relates to the technical field of microwave remote sensing, in particular to a microwave remote sensing soil moisture product downscaling method based on fusion of time and space information. Background technique [0002] The spatial resolution of the pixels of passive microwave remote sensing soil moisture products is generally around 10 km to 25 km. Soil moisture products with such a low spatial resolution cannot meet the needs of small-scale scientific research and business applications, thus restricting the application of passive microwave remote sensing soil moisture products in agriculture, water conservancy and other industries. Therefore, how to improve the spatial resolution of passive microwave remote sensing soil moisture products has become one of the key and hot issues in the field of passive microwave remote sensing soil moisture inversion. [0003] Traditional soil moisture downscaling methods mainly use interpolation or t...
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IPC IPC(8): G06F17/18G06K9/62G01N22/04
CPCG06F17/18G01N22/04G06F18/25
Inventor 张涛王光辉齐建伟张伟王界郑利娟翟浩然
Owner 自然资源部国土卫星遥感应用中心