IDL-oriented projection transformation algorithm

A conversion algorithm and projection technology, applied in the direction of reproduction, calculation, 2D image generation according to projection, etc., which can solve the problem of not being able to cut data.

Active Publication Date: 2018-04-20
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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Problems solved by technology

Researchers cannot simply cut out part of the data in polar regions, because the projection of global data is different from the projection dedicated to studying polar regions, w

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  • IDL-oriented projection transformation algorithm
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  • IDL-oriented projection transformation algorithm

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] Such as figure 1 As shown, read the longitude and latitude of the global temperature data of the UTM projection, the longitude and latitude of the polar region projected on the polar positive axis, and the global temperature data; define variables for storing the converted polar temperature data; by calculating each grid of the polar longitude and latitude The distance from each grid of the global longitude and latitude, assign the air temperature data pointed to by the global longitude and latitude index corresponding to the minimum distance to the variable grid pointed to by the North Pole longitude and latitude index, and calculate all the grids in turn, and finally get the polar positive axis projection Regional temperature data. An example of the present invention is to convert UTM projected global temperature data and arctic region data into polar positi...

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Abstract

The invention relates to an IDL-oriented projection transformation algorithm. Arctic region data of global temperature data of UTM projection is transformed into polar region normal projection. Longitude and latitude (hereinafter referred to as global longitude and latitude) of the global temperature data of the UTM projection, longitude and latitude (hereinafter referred to as arctic longitude and latitude) of an arctic region of the polar region normal projection, and the global temperature data are read by adopting an IDL; variables are defined for storing arctic temperature data after transformation; and a distance from each grid of the arctic longitude and latitude to each grid of the global longitude and latitude is calculated, the temperature data pointed by a global longitude and latitude index corresponding to a minimum distance is assigned to a variable grid pointed by an arctic longitude and latitude index, and all grids are circularly calculated in sequence to finally obtain arctic region temperature data of the polar region normal projection. According to the IDL-oriented projection conversion algorithm, a polar region part can be cut directly from data of global UTM projection and transformed into the polar region normal projection, so that the problem of difficulty in transforming original data of a global parameter into polar region data is solved.

Description

technical field [0001] The invention relates to an IDL-oriented projection conversion algorithm. It belongs to the technical field of remote sensing data processing. Background technique [0002] The IDL programming language is powerful and widely used in aerospace, remote sensing and geo-information fields. When many researchers study polar-related parameters such as temperature, sea temperature, wind, etc., they will encounter a problem. Data such as temperature, sea temperature, and wind are mostly global data projected by UTM, such as Figure 4 Shown is a map of global temperature distribution rather than regional data for the polar regions. Researchers cannot simply cut out part of the data in the polar regions, because the projection of the global data is different from the projection dedicated to the study of the polar regions, which brings more difficulties to researchers. However, there is currently no method to directly crop and convert data from global UTM proje...

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Application Information

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IPC IPC(8): G06T11/00
CPCG06T11/006
Inventor 王云鹤毕海波刘艳霞黄海军
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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