: Underground erosion or the collapse of underground caverns can cause the ground above to crack or form sinkholes.

Use the _MAPTRACE tool in AutoCAD Map 3D 2021 to semi-automate the digitization of the crack centerline based on contrast differences in the raster image.

Disclaimer: This article is for educational and informational purposes regarding historical CAD workflows. Always consult a licensed geotechnical engineer for fissure risk assessment.

That digital crack could be a rendering glitch — or it could be a slow‑moving landslide waiting for a permit.