GB/T 20257.3-2017
ActiveCartographic symbols for national fundamental scale maps—Part 3：Specifications for cartographic symbols 1:25 000 1:50 000 & 1:100 000 topographic maps
国家基本比例尺地图图式 第3部分：1:25 000 1:50 000 1:100 000地形图图式
Application Summary AI generated
This standard specifies the design, classification, and usage of cartographic symbols for 1:25,000, 1:50,000, and 1:100,000 scale topographic maps in China. It is applied by national surveying and mapping agencies, GIS developers, and cartographers to ensure consistent representation of terrain, hydrography, vegetation, and man-made features across these medium-scale maps. The standard supports land management, infrastructure planning, and military or environmental mapping projects requiring uniform symbol interpretation.
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Transparency note: The application summary and key sentences on this page were automatically generated by AI from the standard's original text. This content has not been human-verified and should not be used for compliance or regulatory purposes. Always refer to the official standard document from the issuing authority.