Calculation Method of Earth's Surface Area Based on Large Area Raster Digital Elevation Model

Abstract

The invention discloses a land surface area calculation method based on a large-area grid digital elevation model. According to the method of the invention, an original grid digital elevation model is segmented to a plurality of grid data; then the land surface area of each grid data is calculated; and finally the land surface area of the original grid digital elevation model is obtained through adding the surface areas of all the grid data. Because a large data blocking strategy is utilized, the land surface area of the large-area grid digital elevation model can be efficiently calculated; a triangular network is constructed in a pixel grade scale; and furthermore edge pixels are accurately processed. Compared with an existing calculation method, the land surface area calculation method has advantages of higher calculation precision, effective surface area algorithm precision improvement, and effective settlement for a problem of insufficient computer memory in calculating the surface area of a big-data-volume digital elevation model.

Description

technical field The invention relates to a method for calculating the surface area of ​​an earth surface based on a large-area grid digital elevation model, and belongs to the technical field of spatial analysis of geographic information. Background technique With the rapid development of 3D technology, a large number of 3D terrain data appear in our work and life, among which the digital analysis of 3D terrain provides us with rich and reliable data, and the surface area of ​​the earth is a kind of digital analysis that is often used. The surface area of ​​the earth is difficult to measure and calculate directly, and the projected area is generally used instead of the surface area. In plain areas with small topographical undulations, there is little difference between the real surface area and projected area, but in mountainous areas with complex topographical undulations, there is a significant difference between the two. At present, there are many methods to calculate t...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to provide a method for calculating the surface area of ​​a large-area grid digital elevation model, improve the accuracy of the existing surface area algorithm, and solve the problem of insufficient computer memory for calculating the surface area of ​​a digital elevation model with a large amount of data

Images