GB/T 20257.4-2007

This standard specifies the cartographic symbols, colors, and patterns to be used on Chinese national fundamental scale topographic maps at scales of 1:250,000, 1:500,000, and 1:1,000,000. It is applied by surveying, mapping, and geographic information professionals to ensure uniform representation of terrain, water systems, vegetation, transportation networks, and administrative boundaries across these medium-to-small scale maps. The standard is critical for national mapping projects, regional planning, and resource management where consistent map symbology is required for accurate spatial analysis and decision-making.