Terrain data conversion method and device, electronic equipment and storage medium

Abstract

The embodiment of the invention provides a topographic data conversion method and device, electronic equipment and a storage medium, and relates to the field of surveying and mapping. The method comprises the following steps: reading an elevation value in grid topographic data, converting the elevation value into a pseudo-elevation value of which the unit is millimeter and is a positive integer, converting the pseudo-elevation value into numerical values of red, green and blue wavebands according to a preset corresponding relation, and then storing the grid topographic data as data in a picture format according to the numerical values of the red, green and blue wavebands. Therefore, the raster topographic data is converted into the data in the picture format at the millimeter-level precision, and lossless compression can be performed on the raster topographic data by using the lossless compression technology of the picture format, so that the file size of the raster topographic data is effectively reduced, the storage cost of the data is reduced, and the transmission efficiency of the data is improved.

Description

technical field [0001] The present invention relates to the field of surveying and mapping, in particular to a terrain data conversion method, device, electronic equipment and storage medium. Background technique [0002] In the surveying and mapping industry, aerial photogrammetry results usually record the terrain fluctuations in the surveying area with single-band raster images. The most common raster digital terrain models are DSM (Digital Surface Model, Digital Surface Model) and DEM (Digital Elevation Model, digital elevation model), usually stores data in GeoTiff file format. [0003] DSM refers to the ground elevation model that includes the height of surface buildings, bridges and trees. DEM is a digital simulation of ground terrain through limited terrain elevation data (that is, the digital expression of terrain surface morphology). It is a solid ground model that uses a set of ordered numerical arrays to represent ground elevation. TerrainModel, a branch of dig...

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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a terrain data conversion method, device, electronic equipment and storage medium to solve the problems in the prior art that the volume of terrain data files is huge, resulting in high data storage costs and low transmission efficiency

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