[OSM-talk] Mapping Klong Toey Slums

Tue Aug 9 08:29:58 UTC 2016

Hello Mishari,

I use DJI Phantom 3 Advanced [1]. There is already Phantom 4 which has 
got slightly better camera, but a bit shorter flight range. Phantom has 
got intelligent flight modes, from which I use the Point of Interest. In 
this mode aircraft flies automatically around an object, and it is 
impossible to pilot so precisely manually (an example is on the video 
below).

There is also DJI Inspire quad but it weighs 2.9 kg (two times more than 
Phantom's 1.2 kg). All DJI quads has got a GPS navigation and a GPS 
enabled camera, so there will be exact geographical coordinates in 
produced JPG images, and an aircraft has got a Return Home feature. 
Return Home means that if a pilot lost a quad from the LOS (line of 
sight) in the sky, or a radio control signal is lost for some reason, it 
still can return and land automatically via this feature. It is an 
useful security function.

I would recommend to fly early in the morning on a sunny and quiet day 
(see local weather forecast beforehand), as the light is better [2], the 
air is clear, but also there are less people and less vehicles on the 
streets early in the morning. I usually wait for good weather as long as 
it takes for flying in a town or a city.

Also it makes sense to check local regulations [3] (but better from an 
official source), and try to follow them as much as possible. As much as 
possible, because, for instance, it is allowed normally to fly only in 
the LOS mode, but fly-always may happen unintentionally, in this case a 
pilot may still return either via FPV (first person view), or Return 
Home feature.

[1] http://www.dji.com/product/phantom-3-adv
[2] https://en.wikipedia.org/wiki/Golden_hour_(photography)
[3] 
http://www.richardbarrow.com/2015/08/quick-look-at-the-new-and-updated-drone-law-in-thailand/

brgds
O.M.

On 09/08/16 09:55, Mishari Muqbil wrote:
>
> Hello,
>
> I'm just trying to track down a drone provider but I'm not sure if 
> anyone here has ideas of the kind of specifications I should be asking 
> for. I assume that it should have a GPS enabled camera and some sort 
> of path following feature. Anything else?
>
> Thank you everybody for your input so far.
>
> Best regards
> Mishari
>
>
> On Jul 28, 2016 12:29 PM, "Oleksiy Muzalyev" 
> <oleksiy.muzalyev at bluewin.ch <mailto:oleksiy.muzalyev at bluewin.ch>> wrote:
>
>     Power poles, wires, wind, trees are usual dangers for multirotor
>     aircraft too. There is also an issue of a large bird attack. These
>     risks could be mitigated via sport flying.
>
>     I usually train sport flying at a stadium very early in the
>     morning when there no people there. I have got a small trainer
>     quadcopter, several foldable Air Gates, and Air Flags. There are
>     also gates at an American football field with high poles, which
>     are good for learning to fly in narrow spaces.
>
>     I have an impression that birds being excellent fliers themselves
>     can immediately see the level of piloting skills of a RPAS
>     (Remotely Piloted Aircraft System) pilot. If they see that it is
>     an friendly experienced pilot they usually do not attack. In any
>     case I regularly train diving and other BFM
>     <https://en.wikipedia.org/wiki/Basic_fighter_maneuvers> .
>
>     In addition to aerial images I also film aerial video. Video
>     provides an additional information. For example, recently I filmed
>     a medieval Bilhorod-Dnistrovskyi fortress [1] in Ukraine. I upload
>     a video to Wikimedia, add a video link to the Wikidata page, and
>     add wikidata tag to the OSM map for this object.
>
>     Wikimedia accepts videos only in open OGG and WEBM formats.
>     Unfortunately, some quality is always lost during conversion to
>     these formats. You can see the same HD video at youtube and
>     compare the quality [2]; I tried all convertors which I could find
>     for Mac.
>
>     [1] https://en.wikipedia.org/wiki/Bilhorod-Dnistrovskyi_fortress
>     <https://en.wikipedia.org/wiki/Bilhorod-Dnistrovskyi_fortress>
>     [2] https://youtu.be/C-kQjmzlY7A
>
>     On 27/07/16 23:42, hyances at gmail.com <mailto:hyances at gmail.com> wrote:
>>     Yes, ballons and kites is a good community-engaged method; in my
>>     particular case we face problems with the public-lab-ballon-kit
>>     because irregular power poles/wires at a low height, plus some
>>     wind present during the activity, so it wasn't possible (and a
>>     little insecure).  Regarding stiching it was not so easy to deal
>>     with 89 pictures using the MapKnitter (version 1 1/2 years ago),
>>     so by the moment aerial orthophotomosaics software seems to be
>>     the option. Another point regarding ballons is the cost of the
>>     helium.
>>
>>     About security (and mobile apps) you should consider to create a
>>     previous relationship with the community, so start with workshops
>>     or other activities.  In my particualr case for the replication
>>     in other slums in Colombia, the conclution to my proposal was
>>     "not recommended".  If your focus is catastral, ultra-high-res
>>     aerial imagery is the better way, mobile apps can create
>>     ancyllary pictures, very useful indeed
>>     <https://hotosm.org/updates/2016-07-27_introducing_the_mapillary_humanitarian_mapping_kit_in_partnership_with_hot>.
>>
>
>
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