Hi Darafei,
I did something similar with DJI Phantom and an open source stack, but
it seems the Pix4d software does the orthorectification & stitching
better. I will probably give it a try in future. Long time processing
issue could be solved by faster hardware.
A disadvantage of multi-rotors approach is that it's not scalable. For
instance, I walked for three hours just to film with a quad-copter a two
minutes video [1] and some still images of the mountain lake Lac de
Lovenex for its Wikimedia category [2]. On the way back I was literally
dropping from exhaustion.
I work now on a project of a long-range FPV fixed-wing RC aircraft. I
build it around Vector autopilot [3]. An electric RC glider can stay in
the air much longer, hours or even days (the world record is 81.5 hours
[4]) instead of 20 - 40 minutes for a multi-copter.
A RC plane has got only on motor, one ESC, so it uses less energy, has
less metallic parts, and it is cheaper to build. However, it takes time,
3-4 years, to learn to pilot a fixed-wing plane well, especially
landings in adverse weather conditions.
The idea is to build a reliable light RC plane which is capable to stay
in the air for several hours, automatically fly along the way-points at
a constant altitude for the aerial photography and videography, with a
range of about 100 km, with as much DIY as possible to reduce the cost
and make it repairable.
[1] https://commons.wikimedia.org/wiki/File:Lac-de-Lovenex.webm
or on Youtube:
https://youtu.be/Jx5tRCKobSc
[2] https://commons.wikimedia.org/wiki/Category:Lac_de_Lovenex
[3] http://www.eagletreesystems.com/
[4] https://youtu.be/8m4_NpTQn0E
Best regards,
Oleksiy
On 02.09.17 09:38, Darafei "Komяpa" Praliaskouski wrote:
We're using DJI Mavic ($1000), Pix4D Capture application and Pix4D
($300/mo) to get orthorectified imagery in Belarus. It takes 1
battery, 20 minutes of flight time and several hours processing to get
1x1 km chunk in 6 cm/px.
Sample:
https://cloud.pix4d.com/pro/project/169316?shareToken=9fda4c2a6fc64b938886d3f4fa477692
DSM and 3D is also generated.
We upload it to OpenAerialMap. There are some issues in their pipeline
that make imagery not very crisp:
https://github.com/hotosm/oam-dynamic-tiler/issues/49
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