Satellite precipitation space downscaling optimal regression window screening method and device

A screening method and downscaling technology, applied in the field of satellite precipitation observation, can solve the problems of large amount of calculation, lack of auxiliary data, limitations, etc., and achieve the effect of high precision and high spatial resolution

Inactive Publication Date: 2020-09-22
NANJING HYDRAULIC RES INST
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Problems solved by technology

Among them, dynamic downscaling is an effective way to obtain precipitation with high spatial resolution. It uses the global climate model coupled with the regional climate model to predict future climate development scenarios. The physical meaning is clear and not affected by observation data, but the calculation is large and the auxiliary data is lacking. , often limited to the study of large-scale climate models

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  • Satellite precipitation space downscaling optimal regression window screening method and device
  • Satellite precipitation space downscaling optimal regression window screening method and device
  • Satellite precipitation space downscaling optimal regression window screening method and device

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Embodiment Construction

[0023] The solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] like figure 1 As shown, a satellite precipitation space downscaling optimal regression window screening method disclosed in the embodiment of the present invention includes the following steps:

[0025] (1) Obtain the first spatial resolution (relatively high, such as 1km) digital elevation data (Elevation) and normalized difference vegetation index data (NDVI) of a given research area as independent variables, and pixel aggregation resampling to the second Spatial resolution (relatively low, such as 10km); GPM IMERG V06B satellite precipitation data of the second spatial resolution in the study area is obtained as the dependent variable, and rainfall station data in the study area are collected as ground reference values ​​for the performance verification of the downscaling model. This embodiment takes 1 km and 10 km s...

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Abstract

The invention discloses a satellite precipitation space downscaling optimal regression window screening method and device, and the method comprises the steps: obtaining digital elevation data and normalized vegetation index data of a first spatial resolution as independent variables, carrying out the resampling of a second spatial resolution, and obtaining satellite precipitation data of the second spatial resolution as dependent variables; constructing three regression models of a global window, a local window and a pixel-by-pixel change local window according to the independent variable andthe dependent variable of the second spatial resolution, and screening an optimal local window and an optimal pixel-by-pixel change local window; and according to the regression model and the independent variable data of the first spatial resolution, obtaining rainfall prediction data of the first spatial resolution under the three typical regression windows, and determining an optimal regressionwindow through verification of actually measured rainfall station rainfall data. The method can effectively screen the optimal regression window of satellite rainfall downscaling, and is simple and easy to operate and high in prediction precision.

Description

technical field [0001] The invention belongs to the technical field of satellite precipitation observation, and in particular relates to a method and device for selecting an optimal regression window for satellite precipitation spatial downscaling. Background technique [0002] The high-precision precipitation spatial observation data with high temporal and spatial resolution can better describe the detailed information of precipitation, which is of great significance for agricultural irrigation, disaster reduction and prevention, and watershed hydrological process simulation and forecasting. Compared with traditional precipitation observation stations, satellite precipitation can conduct large-scale and rapid spatial observation of precipitation, which is an effective way to obtain the spatial distribution of regional precipitation. However, the relatively coarse spatial resolution of existing satellite precipitation data (such as GPMIMERG V06B data with a resolution of 10 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/18
CPCG06F17/18
Inventor 陈求稳陈诚覃宾妮张建云何梦男何欣霞李港
Owner NANJING HYDRAULIC RES INST
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