[OSM-talk] a sample panoramic aerial image for 3D mapping made with the new DJI Spark quad-copter

Darafei "Komяpa" Praliaskouski me at komzpa.net
Sat Sep 2 07:38:12 UTC 2017


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.muzalyev at bluewin.ch>:

> On 9/1/2017 5:12 PM, Martin Koppenhoefer wrote:
>
>
>
> 2017-09-01 16:24 GMT+02:00 Oleksiy Muzalyev <oleksiy.muzalyev at 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
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