Abstract
Abstract. TIANDITU (Map World) is the public version of National Platform for Common Geospatial Information Service, and the terrain service is an important channel for users on the platform. With the development of TIANDITU, topographical hill shading map production for providing and updating global terrain map on line becomes necessary for the characters of strong intuition, three-dimensional sense and aesthetic effect. As such, the terrain service of TIANDITU focuses on displaying the different scales of topographical data globally. And this paper mainly aims to research the method of topographical hill shading map production globally using DEM (Digital Elevation Model) data between the displaying scales about 1 : 140,000,000 to 1 : 4,000,000, corresponded the display level from 2 to 7 on TIANDITU website.
Highlights
Topographical hill shading map production for providing and updating global terrain map on TIANDITU (MAP WORLD) becomes necessary for enriching multi-resource data and multiscale coverage
This paper mainly aims to research the method of topographical hill shading map production globally using DEM (Digital Elevation Model) data between the displaying scales about 1:140,000,000 to 1:4,000,000, corresponded the display level from 2 to 7 on TIANDITU website
The general design process involves DEM data preprocessing, hill shading map production, which includes adjust the azimuth, altitude and Z factor, elevation classification, hypsometric tint, cache production, and data updating on line
Summary
Topographical hill shading map production for providing and updating global terrain map on TIANDITU (MAP WORLD) becomes necessary for enriching multi-resource data and multiscale coverage. Compares with traditional topographical hill shading map, the map online for topographical hill shading map production requires the characters of stronger intuition, threedimensional sense and aesthetic effect. As a significant channel for users on TIANDITU, the terrain service of TIANDITU focuses on displaying the different scales of topographical data globally. This paper mainly aims to research the method of topographical hill shading map production globally using DEM (Digital Elevation Model) data between the displaying scales about 1:140,000,000 to 1:4,000,000, corresponded the display level from 2 to 7 on TIANDITU website
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