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Method and system for specific surface area extraction based on geodetic coordinate system digital elevation model

A technology of digital elevation model and geodetic coordinate system, applied in the field of geographic information space analysis, can solve the problems of small amount of calculation, low efficiency, large amount of calculation, etc., to achieve the effect of improved accuracy, high efficiency and simple realization

Inactive Publication Date: 2015-08-05
WUHAN UNIV
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Problems solved by technology

In GIS, the two models have their own advantages and disadvantages: the vector model can describe the shape, boundary, range and position of geographic objects very accurately, but the efficiency of spatial operations based on the vector model is low and the amount of calculation is large; the raster model cannot be accurate Describe the shape, range, boundary and position of geographic objects, but it has high computational efficiency and small amount of calculation when performing spatial operations

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  • Method and system for specific surface area extraction based on geodetic coordinate system digital elevation model
  • Method and system for specific surface area extraction based on geodetic coordinate system digital elevation model
  • Method and system for specific surface area extraction based on geodetic coordinate system digital elevation model

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Embodiment Construction

[0067] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings and embodiments.

[0068]The premise of calculating the surface area of ​​the Earth's surface is to carry out numerical simulation and approximation of the Earth's surface. The DEM simulates the earth's surface with a discrete, regular grid. However, the earth's surface is a continuous surface, and a continuous surface cannot be obtained directly based on DEM. Therefore, the present invention proposes, when calculating the ground surface, an interconnected triangular network can be constructed based on discrete grid points on the DEM (in the space Cartesian coordinate system, any 3 points can be guaranteed to be on the same plane, and 3 more than two points cannot be guaranteed to be on the same plane, nor can the area be calculated). A triangular network composed of multiple connected triangles is used to approximate the real continuous s...

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Abstract

The invention provides a method and a system for specific surface area extraction based on a geodetic coordinate system digital elevation model (DEM). The method comprises: an original DEM using the geodetic coordinate system to store, creating a grid file; traversing grid pixels of the original DEM in sequence, selecting adjacent four points to establish a regular triangle, and calculating surface area of a new grid pixel region, defining the obtained grid file as a digital specific surface area model SAM; giving any vector polygon, performing spatial overlaying on the vector polygon and the SAM, and summarizing pixel values of the grid pixels which are in the vector polygon in the SAM, to obtain the specific surface area of the vector polygon. As a whole, the method and the system are characterized by simple realization and high efficiency. Compared with the prior art, the precision is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of geographical information spatial analysis, and in particular relates to a technical solution for extracting the surface area of ​​the earth based on a digital elevation model of a geodetic coordinate system. Background technique [0002] In the field of geographic information spatial analysis technology, the current research on the surface area of ​​the earth is introduced as follows: [0003] (1) Surface area of ​​the earth [0004] Earth's surface area is the area of ​​the Earth's surface combined with topographical conditions. In the field of geographic information technology, the earth is usually simplified as a standard ellipsoid when modeling the earth, without considering the actual fluctuation of the earth's surface. Therefore, when performing map drawing and area measurement, various surface features and elements are usually abstracted into geometric objects of different shapes such as points, ...

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Application Information

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IPC IPC(8): G06T17/05G06T17/30
Inventor 赵翔刘耀林刘殿锋何建华焦利民
Owner WUHAN UNIV