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A programmatic extraction method for raster data-oriented region and watershed data

A raster data and extraction method technology, applied in the direction of structured data retrieval, database management system, etc., can solve the problems of cumbersome operation and inconvenient batch processing, and achieve the effect of simple data extraction process and high efficiency

Active Publication Date: 2022-03-04
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the disadvantages of inconvenient batch processing and cumbersome operation when the amount of long-term series of raster data is large in the above-mentioned prior art, the present invention provides a programmatic extraction method for raster data-oriented region and watershed data

Method used

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  • A programmatic extraction method for raster data-oriented region and watershed data
  • A programmatic extraction method for raster data-oriented region and watershed data
  • A programmatic extraction method for raster data-oriented region and watershed data

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Embodiment 1

[0054] This embodiment is based on the data of GD province and GZ province 1982-2015, elaborates the specific steps of the implementation of the present invention:

[0055] 1. The monthly average temperature data in the standard NetCDF file format from 1982 to 2015 in the standard NetCDF file format is used as the data source, and its geographical coverage is as follows: figure 2 As shown, the monthly and interannual data of the provincial temperature are extracted using the shp files of the administrative boundaries (including islands) of GD and GZ provinces.

[0056] (1) Use the reader function of the shapefile to read the maximum and minimum values ​​of the longitude and latitude of the boundaries of GD and GZ provinces. Because the range function is only for the shaping parameters and the principle of "rounding up", use the range function to convert the four-to-point It is determined as the rectangular boundary of raster data analysis, and the grids that overlap with GD a...

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Abstract

The invention discloses a programmatic extraction method for raster data-oriented region and watershed data. The specific operation process of the method includes: file reading; space overlapping calculation; data output; function calling four sub-module parts; The script language development environment avoids the manual processing of batch data, avoids the complex operation of commercial software and copyright issues, and ensures the accuracy and efficiency of the target area observation or prediction space data extraction, and the code structure is simple and easy to operate Flexible and efficient.

Description

technical field [0001] The invention relates to the field of meteorological data extraction, and more specifically, to a grid data-oriented programmatic extraction method for region and watershed data. Background technique [0002] NetCDF type files can flexibly transmit and process massive array-oriented data, and are currently widely used in many fields such as atmospheric science, hydrology, oceanography, environmental simulation, and geophysics. In related technologies, when the amount of long-time series raster data is large, it is usually inconvenient to use spatial analysis software for batch processing, and the operation is cumbersome, and the drawing process must also be operated across platforms, specifically including: [0003] 1. Commonly used spatial analysis software extracts the raster cell values ​​of multiple files in batches, but for a large number of long sequence data of a single file, only the first cell value of a cell can be read and extracted, which d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F16/25
Inventor 赵铜铁钢杨振华黄泽青
Owner SUN YAT SEN UNIV