Aerial triangulation
Aerial Triangulation (AT) is the foundational step in photogrammetric mapping that determines the precise position and orientation of each aerial image in 3D space. By identifying common points in overlapping photos and using mathematical calculations, AT establishes the spatial relationships between images and aligns them to real-world coordinates. At Thinkaerial, aerial triangulation is performed with high precision to ensure all subsequent mapping outputs—like orthophotos, DSMs, and vector layers—are georeferenced with maximum accuracy.
A glimpse into our stunning aerial Triangulation showcase.
Master Process Which We Follow
1. Image Preprocessing
Import raw aerial or drone imagery into photogrammetry software.
Check and clean image metadata (GPS, camera parameters).
2. Tie Point Generation
Automatically detect and match tie points (common features) across overlapping images.
Generate a sparse point cloud that connects image positions.
3. Ground Control Point (GCP) Integration
Import survey-grade Ground Control Points to anchor the image block to real-world coordinates.
Optionally add Check Points for accuracy validation.
4. Bundle Block Adjustment
Run a bundle adjustment—a mathematical optimization that calculates the 3D position and orientation (X, Y, Z, omega, phi, kappa) of each image.
Correct any distortions or errors in image alignment.
5. Error Analysis & Adjustment
Review residuals and accuracy reports to identify errors in tie points or GCPs.
Adjust tie points manually or reprocess if needed to meet accuracy standards.
6. Final Alignment & Export
Confirm that the image block is accurately georeferenced.
Export triangulated image positions for further steps like DSM, orthophoto, and feature extraction.
