Geological Terrain Mapping is used as a planning tool for physical development. 

✓ A terrain map shows an area of land divided into terrain map units defined by similar elevation, slope, landform, rock exposure, surficial material type and thickness. 

✓ Examples of thematic map produced are: 

• Terrain classification map 

• Slope gradient map 

• Terrain morphology map 

• Erosion and instability map 

• Construction suitability map 

• Engineering geological map 

✓ Applications of GTM are: 

• Terrain hazard and constraint identification. 

• Manage landslide risk. 

• Watershed assessment. 

• Such information can be used to assist engineers and planners to prepare a layout plan, design foundation system and choose the most appropriate type and method of construction.