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Satellite rainfall and actually measured rainfall error partition fusion correction method

A technology of satellite and error, which is applied in the field of regional fusion correction of satellite rainfall and measured rainfall error, can solve the problems of satellite monitoring rainfall data such as large error, poor accuracy, and inability to be directly applied, so as to improve overestimation or underestimation and improve accuracy , the effect of high spatio-temporal resolution

Active Publication Date: 2019-12-06
HOHAI UNIV
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Problems solved by technology

[0005] Purpose of the invention: The purpose of the present invention is to provide a method for fusion and correction of satellite rainfall and measured rainfall error partitions. The technical problem to be solved is that there are large errors in current satellite monitoring rainfall data, and the accuracy is not good, so it cannot be directly applied to hydrology and other fields. in the research

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[0059] Select a certain watershed, and adopt the method that the present invention provides a kind of satellite rainfall and measured rainfall error partition fusion correction to correct the satellite rainfall data (TRMM 3B42RT), specifically comprising the following steps:

[0060] (1) According to the "Hydrological Yearbook" and other data sources, the measured rainfall data of the basin during the flood period from 2007 to 2014 and the TRMM 3B42RT satellite rainfall data during the flood period from 2007 to 2014 were selected, with the same time span and spatial resolution of 0.25°× 0.25°.

[0061] (2) Since the time interval of the TRMM 3B42RT satellite rainfall data is 1 hour, and the initial measured rainfall data are not at equal time intervals, the above-mentioned rainfall accumulation time series segmental linear interpolation method is used to interpolate the measured rainfall and convert it into 1 hour interval data.

[0062] (3) Using spatial interpolation method...

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Abstract

The invention discloses a satellite rainfall and actually measured rainfall error partition fusion correction method, and belongs to the technical field of satellite rainfall data precision correction. The related correction method relates to values of each station and each moment, can effectively solve the problems of excessive estimation or underestimation, missing report in a small-value area and the like of satellite rainfall monitoring, and remarkably improves the precision of the satellite rainfall data precision correction method. The correlation between the hourly satellite rainfall data corrected by the method and the hourly actually measured rainfall data reaches 0.9 or above, which meets the flood forecasting precision requirement, and continuous observation of large-range rainfall can be achieved due to wide space coverage and high temporal-spatial resolution, and large-area continuous rainfall distribution is obtained, and the method can be better used in the fields of hydrology and the like, and has a good application prospect in areas with sparse ground stations and even without data.

Description

technical field [0001] The invention belongs to the technical field of precision correction of satellite rainfall data, and in particular relates to a method for regional fusion correction of errors of satellite rainfall and measured rainfall. Background technique [0002] One of the key links in the water cycle is precipitation, which has a significant impact on the spatial allocation of water resources due to its high spatiotemporal heterogeneity. High-quality rainfall data is not only a prerequisite for ensuring the accuracy of flood forecasting, but also plays a vital role in fields such as meteorology, hydrology and agricultural production. At present, the traditional source of rainfall data is the observation of rainfall stations. However, due to the small distribution density and uneven spatial distribution of rainfall stations, it is difficult to ensure the accuracy of the spatial structure of precipitation. Therefore, it is necessary and important to improve the ac...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06K9/62G06Q50/26
CPCG06Q10/04G06Q50/26G06F18/251Y02A10/40
Inventor 杨传国闵心怡余钟波郝振纯程雨春鞠琴谷黄河
Owner HOHAI UNIV
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