National Highway Corridor Terrain Mapping
Aerial triangulation, DTM and true-ortho production over 6,200 sq km for highway alignment studies.
Where the client started
A national highway authority needed survey-grade terrain over 6,200 square kilometres of mixed jungle and settlement to compare alignment options — with design consultants already contracted and waiting.
The OutcomeWhere they ended up
Verified vertical accuracy of ±9 cm RMSE, delivered 100% on the agreed schedule. Design consultants ran alignment comparisons on time, and the authority reused the terrain base for two subsequent corridor studies.
How we delivered
GCP-controlled aerial triangulation with rigorous block adjustment and sigma reporting
DSM extraction with intensive bare-earth editing through vegetated terrain
Breakline enforcement along drainage and road features for hydrologically sound DTMs
True-orthophoto production with seamline editing across all corridor sheets
- Adjusted aerial triangulation blocks
- Bare-earth DTM at design grade
- True orthophotos & mosaics
- Cross-sections for alignment options
- Accuracy report vs ground truth
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