Mavic Pro 2 GSD=8mm

The Mavic 2Pro’s L1D-20c camera has photogrammetric potential. To establish flight parameters for 1:200 scale mapping with it an effective minimum ceiling and shot interval need to be tested. In theory this is a simple application of the photo-scale equation but in practice the exposure, capture rate and camera characteristics have an influence on what works best.

In preparation for a Community Archaeology Project I flew nadir cover of a site with open fields in 3 sides at 3 heights: 25, 65 and 90m AGL.

The camera was set to ISO 200, aperture priority at f8, ev-0.3, shutter speeds were between 1/120th and 1/240th.

A 50% reduction of the projected ortho-image processed from 91 frames:

Cmy_Ortho_50pc_05

100% screen grab from ortho-image:

The original frame capture area:

capture was under broken cloud resulting in a mix of exposures:

Conclusion: The Mavic Pro 2 flown for nadir cover at a height of 25m AGL is sufficient to resolve 1:200 mapping  and at 90m for 1:1000. The 1.08ha area required a single battery (in windless conditions) for a 18min flight in 3 swaths. Obstacle avoidance to comply with PfCO required perimeter swaths to be flown at the higher level. No obliques were taken for this exercise, this would improve the under tree cover and allow surface edits (tree removal) prior to ortho production.

B (8867)

About billboyheritagesurvey

Heritage worker
Gallery | This entry was posted in SUA photography, Survey Practice. Bookmark the permalink.

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