Survey In Gangotri & Yamunotri

We recently conducted a high-resolution UAV/Drone-based topographical survey in the Gangotri and Yamunotri shrine areas, supporting upcoming tourism infrastructure development projects in these high-altitude Himalayan regions.

1. Objective

To generate accurate topographical maps, 3D terrain models, and orthomosaic imagery for planning eco-sensitive and resilient tourism infrastructure.

2. Scope of Work

• UAV aerial survey of shrine zones and buffer areas

• DGPS-based Ground Control Point (GCP) establishment

• Photogrammetry data processing

• Delivery of GIS-compatible topographic outputs

3. Survey Coverage

• Areas surveyed: Shrine zones, trails, proposed development sites

• Terrain: Steep, high-altitude regions

4. Methodology

a) DGPS Survey

Established accurate GCPs for geo-referencing UAV data with sub-meter precision.

b) Aerial Image Acquisition

Captured high-res images using drones with >20MP cameras, ensuring full coverage with optimal overlap.

c) Photogrammetry Processing

Processed using tools like Pix4D/Agisoft for:

• Orthomosaic imagery

• DSM/DTM

• Contour maps

• 3D terrain models

5. Deliverables

• Georeferenced orthophotos

• DEM/DSM & 3D models

• Contour maps 

• AutoCAD & GIS-ready files

• DGPS report & raw UAV data

This survey enables data-driven planning for sustainable tourism while preserving the ecological and cultural integrity of the Char Dham region.