Cosmic ray neutron instrument spatial feature simulation method combined with remote sensing data

Abstract

The invention discloses a cosmic ray neutron instrument spatial characteristic simulation method combined with remote sensing data, and aims to solve a problem that a cosmic ray neutron method is difficult to reflect spatial heterogeneity in soil moisture measurement. The method comprises the following steps of calculating a normalized vegetation index and surface temperature by using Landsat8 remote sensing data; the invention provides a soil moisture content horizontal direction parameter correction method considering underlying surface condition factors such as surface vegetation and surface temperature, and combines neutron footprint characteristics of a cosmic ray neutron detector and soil types to simulate soil moisture vertical correction parameters; so soil moisture three-dimensional space distribution characteristic simulation within the observation range of the cosmic ray neutron detector is achieved, the precision degree of soil moisture observation of the cosmic ray neutron detector is improved, the soil moisture space distribution difference in a measurement area is objectively reflected, and a foundation is laid for soil moisture remote sensing authenticity inspection.

Description

technical field [0001] The invention belongs to the technical field of measurement technology popularization, and in particular relates to the design of a method for simulating space characteristics of a cosmic ray neutron instrument combined with remote sensing data. Background technique [0002] Soil moisture is a key parameter in the water cycle, energy cycle, and biogeochemical cycle. The current ground observation methods of soil moisture are divided into point observation and surface observation according to the spatial representation of the observation data. The observation results of point observation are spatial point data, and the spatial representativeness is small, so it is difficult to accurately describe the spatial distribution of soil moisture. The main methods are drying weighing method, tensiometer method, neutron meter method and dielectric property method. The observation results of surface observation can realize the spatial continuity observation of soi...

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Problems solved by technology

In fact, due to the different underlying surface conditions in the measurement source area, the soil moisture has obvious spatial heterogeneity in the region, and the difference in the spatial distribution of soil moisture cannot be revealed only by instrumental measurement, which restricts the cosmic ray neutron method to a certain extent. In the accurate measurement and application of soil moisture, it is necessary to carry out the simulation of its spatial characteristics in combination with the influencing factors of the underlying surface

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