So. In planning a “stepped” flight above.
If I am taking off from near the “B” location (higher msl portion of a site) how can I set the height in Pix4d Capture to a correct photo capture rate? The capture software is trying to increase my overlap (thus flight time) and battery usage.
For the specific real-world application. I have a building campus (28-ac) on a hillside area with 392-ft vertical distance from the lowest point of ground to highest point of a building. I have trees, open space, building rooftops, parking lots, roadways, open space, etc. I have planned out 3 flights with steps and overlaps. I am also planning a 4th (maybe also 5th) flight around the building to merge into the dataset.
I am planning to take off from a building top, near campus center, mid-campus elevation (between lowest & highest msl) to ensure no communication losses. I have to go over the last building (the tallest building is at the “top” of the hill) near b (your above figure, thus the highest MSL) and capture a low area and open space behind the building.
I assume I would want to fly all flights at the same average ground distance which I calculated to be 210-ft.
- Flight 1 (704-ft msl) - ranges from 114-ft above structure (building) to 272-agl (open space at lowest campus msl),
- Flight 2 (737-ft msl) - ranges from 87-ft above structure (small patch of tall trees) to 319-ft agl (roadway),
- Flight 3 (779-ft msl) - ranges from 74-ft above structure (highest building) to 303-ft agl (loading dock and open space behind the building)
In summary, when taking off from a structure my elevation setting (set at 159-ft, 192 and 234 for each flight respectively) is needed to achieve an average height of 210 in each flight. Since my purpose of the flight is surface mapping ortho and contours (using this for a buried utility map base) I am not concerned about the loss of fidelity when crossing some of the taller structures. I am more concerned with an accurate ground structure footprint. I was planning to take off from a building of 545-ft msl (70-ft agl one side, 40-ft agl another side…remember this is a hillside campus). If I say my height is 210-ft, then the drone (Matrice 210 RTK) will fly the mission on each zone at 210-ft+building height relative to my takeoff point. I want it to go out to the flight 1 zone and fly 210 feet asl not 210-ft + building + change in elevation. This would mean there are locations on the “lower end” of flight 1 where I will likely exceed 400-ft asl.
I thought about flying out to a location and starting the mission, however, this would be:
- in active parking, yard or drive lanes of the campus and
- I may lose signal or line of sight
I believe it would be safer to take off from a building roof or parking garage location. Since the campus has many buildings, tree patch areas, etc. I assume it would be better to fly from the “higher end” of the campus or from the top of a structure to ensure I maintain excellent signals.
Please your suggestions are welcome.
Perhaps this will make more sense related to what I tried to describe. Flights planned (uniform elevation areas) and flight takeoff location (blue star).