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 пт, 1 сент. 2017 г. в 18:42, Oleksiy Muzalyev <oleksiy.muzal...@bluewin.ch>: > On 9/1/2017 5:12 PM, Martin Koppenhoefer wrote: > > > > 2017-09-01 16:24 GMT+02:00 Oleksiy Muzalyev <oleksiy.muzal...@bluewin.ch>: > >> >> But the advantage is that it weighs only 300 grams, very portable, and it >> is ready to fly almost instantly as folding propellers are fixed >> permanently, and smart-phone connects to the remote control via WiFi, no >> cables are necessary. >> > > > did you try how high/far you can get before loosing the wifi connection? > > Cheers, > Martin > > Hello Martin and James, > > In this case was talking about Wi-Fi connection between smart-phone where > runs DJI Go 4 app and the remote control radio, they remain close to one > another all the time. But certainly the flight range of Spark is not as > great as the one of the Phantom. > > There is a list of compatible smart-phones for the Spark at the very > bottom of this page: http://www.dji.com/spark/info#specs . I read at the > DJI forum that if one uses such a smart-phone the range is better. > > I flew Spark maximum about 700 meters away and 150 (legal limit for the > region) meters high. The video & control signals was present all the time, > though my old smart-phone is not in the list. I ordered already a > compatible one. > > For me this range is OK. The best aerial photos are made from the altitude > of 70 - 100 meters anyway, and besides in accordance with the regulations > it is allowed to fly only LoS (line-of-sight) anyway (unless there is a > special license). > The Spark remote controller has got folding outside antennas, so the range > of several hundred meters, or I would guess up to 1 - 1.2 km, is probably > due to these antennas. The range of the Phantom is more than 2 km. > > Best regards, > > Oleksiy > _______________________________________________ > talk mailing list > talk@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk >
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