GB/T 37120-2018 in English

GB/T 37120-2018 is my country's first national standard specifically formulated for rail transit geographic information data, led by the Ministry of Natural Resources. The standard establishes a full-process technical framework including coordinate system, element classification coding, 3D modeling, and data exchange.

Model Classification Requirements

The standard divides rail transit models into three categories: terrain models, engineering element models, and building models. Each type of model must meet different scale accuracy requirements:

• Terrain model: LOD3 level requires a 1:2000 scale DOM, with a plane error of ≤0.7m
• Cat model: Detailed modeling must include components such as insulators and positioning devices
• Tunnel model: The inner contour deviation should be controlled within 0.5%

The standard adopts a two-level inspection and one-level acceptance system. The key quality indicators include:

Data production process optimization

1. Establish BIM+GIS integrated modeling workflow
2. Use mobile laser scanning technology to collect existing line data
3. Develop automated quality inspection tools to verify LOD compliance

Typical application scenarios

After adopting this standard in a subway project:

• Construction collision inspection efficiency increased by 40%
• The data error rate of the asset management system dropped to below 0.5%