|Note||If a drone with a built-in RTK Ground Control Points (GPS) receiver is used, GCPs aren't needed.|
Corridor mapping includes railways, roads, rivers, and so on. In general terms, it’s highly recommended to add GCPs in such projects to make the model more stable and accurate. The number of GCPs depends on the relative accuracy of the image geolocation. If the images have accurate relative position, then 8-10 GCPs are enough. The length of the project also affects the number of the required GCPs. The longer the corridor, the more the GCPs are needed.
Figure 1. Distribution of GCPs in corridor mapping
A denser network of GCPs is recommended:
- If the available budget and time permit the use of more GCPs
- If the image geolocation is not precise
Figure 2. Distribution of many GCPs in corridor mapping.
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