It is important to consider the following facts:

- At a
**defined altitude**,**increasing****the focal length**: - A smaller area is captured, and therefore:
- The Ground Sampling Distance (
**GSD**) value will decrease: one pixel will capture a smaller area and therefore the image will have a**higher spatial r****esolution.** - At a
**defined focal length**,**decreasing the altitude**: - A smaller area is captured, and therefore:
- The
**GSD**value will decrease: one pixel will capture a smaller area and therefore the image will have a**higher spatial r****esolution.**

Terrains:

- Forest and dense vegetation: Flying higher helps for the reconstruction, but the spatial resolution will be lower.
- Buildings: Flying higher reduces the artifacts at the building edges, but the spatial resolution will be lower.

Overlap:

- Low altitude with big focal length will request a very high image rate in order to maintain a good overlap.
- For a given focal length and a given image rate, increasing the altitude will increase the overlap.

For more information about selecting the flight plan type, computing the flight height for a given GSD and computing the image rate to get a given overlap: 202557409.

For more information about configuring the camera settings: 202557419.