Levels of Mapping Accuracy
Satellite mapping is a practical solution for obtaining topographical information over extremely large areas.
Mapping Accuracy
Accuracy is influenced by the density of GCPs and the type of satellite used. Satellite mapping typically has a vertical accuracy of around 1.5 m to 3 m. If you have existing topographical data, we can combine it with our mapping data.
Mapping vs. Surveying
In contrast, satellite surveying is better than 15 cm RMSE in vertical accuracy. Satellite surveying sees applications in earthworks construction and operating mines. See Satellite Surveying.
Mapping without Ground Control Points (GCPs)
When your project requires it, we can complete satellite mapping projects with few GCPs or none. Even with no GCPs, PhotoSat elevation maps are still reliable. See below.
For areas of 100 km2:
| Level of Accuracy | GCPs (per 100 km2) | Over Horizontal Distance | Satellites | Applications |
|---|---|---|---|---|
| 1.5 m (absolute) | <5 | 10 km | ALOS PRISM
SPOT 6 SPOT 7 |
Preliminary exploration
Terrain assessment Feasibility studies |
| 3 m (absolute) | <5 | 10 km | SPOT 6
SPOT 7 |
Preliminary exploration
Terrain assessment Feasibility studies |