[HOT] UAVs
Lukasz Kruk
lukasz.kruk at gmail.com
Mon Jul 15 19:47:30 UTC 2013
Dear Joseph, Dear HOTties,
Thanks for your UAVs post (I hope my messages goes into the right
thread...). It got me really quite interested in joining the
discussion.
We're looking to get a UAV with the main purpose being to take aerial
pictures of refugee camps that we map. Currently, we use satellite
images to do something like http://www.unitar.org/unosat/node/44/1764
- but having our own system would hopefully allow for more frequent
and higher resolution pictures.
Basically, I don't even know where to start research. I've come up
with a list of considerations, but I'm sure there's much more that I'm
missing
* Because of sensitive context, the UAV shouldn't look intimidating -
a more toy-like appearance is a requirement
* How is the UAV controlled - remote or programmed flight path (i'm
assuming the latter is rather advanced - and consequently pricey?)
* Can it carry a camera, and how is the camera mounted to ensure
top-down viewing angles for successful image georeferencing later on
* What camera would be appropriate for the intended use
* Based on a quick calculation, it looks to me that with a typical
wide angle lens (28mm-equivalent) the side image is about half of
camera distance (so in this case - elevation). This means that if I
want to capture a 1x1km area, the camera should fly 2km above ground.
This doesn't seem to be feasible both because of flight height and
off-nadir angles, so it probably means a lot of smaller images and
then stitching?
* Finally, just as a general guideline, the budget I'd have is rather
fluid. If a workable solution can be achieved for a few thousand -
great, but if something vastly superior can be done for 10k, I would
definitely consider that as well
However, in order not to get in over my head, I was thinking that a
DJI Phantom which seems to be all the rage on the internet these days,
fitted with a Pentax WG-3 (which has interval shooting mode) looks
like a set that could provide genuinely useful results for under a
thousand EUR - or am I completely off the mark here?
I'm sure that some of you has already been through the process and
there is a lot written on the internet. Could anyone point me
somewhere I could start reading? Any general comments would be most
appreciated as well - many thanks in advance!
Lukasz
On 10 July 2013 13:41, <hot-request at openstreetmap.org> wrote:
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> Today's Topics:
>
> 1. HMP on India Floods in Uttarakhand (Pierre B?land)
> 2. Re: UAVs (Joseph Pollack)
> 3. Re: Meeting of the Togo Support Team - July 9, 2013 (Andrew Buck)
> 4. Offset error in the newly updated Bing Imagery (amrit karmacharya)
> 5. Re: Offset error in the newly updated Bing Imagery
> (Guttorm Flatab?)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 9 Jul 2013 20:19:39 +0100 (BST)
> From: Pierre B?land <pierzenh at yahoo.fr>
> To: "hot at openstreetmap.org" <hot at openstreetmap.org>, OpenStreetMap in
> India <talk-in at openstreetmap.org>
> Subject: [HOT] HMP on India Floods in Uttarakhand
> Message-ID:
> <1373397579.20491.YahooMailNeo at web172805.mail.ir2.yahoo.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> There are still discussions with various NGO's about moving to activation, but no decision has been taken at this point.
>
> From official reports of casualties, we have identified three valleys where important lanslides andd casualties are reported. For these valleys, we invite the HOT and India contributors to map in detail, the roads, waterways and buildings. When no place tags identify a village, you simply add a place=village or hamlet tag. For village we do not know the name, we do not add a name tag.
>
> Below, we identify when possible the valleys by the road no., which should help to locate them.
>
> When you upload to the OSM database, you are asked to add a comment. To facilitate the follow-up of mapping, indicate :
> India, Uttarakhand, #hotosm, source=Bing
>
> NH58, Chamoli
> from Karnaprayag http://www.openstreetmap.org/?lat=30.26267&lon=79.21267&zoom=16
> to the north of the road http://www.openstreetmap.org/?lat=30.9641&lon=79.4096&zoom=14
>
> Tertiary Road, No ID provided.
>
> From Dewal http://www.openstreetmap.org/?lat=30.0506&lon=79.5756&zoom=14
>
> to Simli http://www.openstreetmap.org/?lat=30.2254&lon=79.2582&zoom=14
>
>
> NH108, Uttarkashi District
>
> from Gangani http://www.openstreetmap.org/?lat=30.89889&lon=78.6734&zoom=15
> to Gangotri http://www.openstreetmap.org/?lat=30.99506&lon=78.93829&zoom=16
> Road for Gangotri to Boshwasa http://www.openstreetmap.org/?lat=30.9485&lon=79.0473&zoom=14
>
> South of Gangani,? Bing Imagery is not available presently.
>
>
> NH109, Rudraprayag Districtfrom? Rudraprayag http://www.openstreetmap.org/?lat=30.2841&lon=78.9774&zoom=14
>
> to Gaurikund http://www.openstreetmap.org/?lat=30.653&lon=79.0245&zoom=14
>
> Trail where important landslides and death
>
> from Gaurikund http://www.openstreetmap.org/?lat=30.653&lon=79.0245&zoom=14
>
> to Kedarnath http://www.openstreetmap.org/?lat=30.7289&lon=79.0784&zoom=12&layers=M
>
> Thanks for your contribution.
> ?
> Pierre
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> ------------------------------
>
> Message: 2
> Date: Tue, 9 Jul 2013 21:56:52 +0200
> From: Joseph Pollack <josephrichardpollack at gmail.com>
> To: hot at openstreetmap.org
> Subject: Re: [HOT] UAVs
> Message-ID:
> <CAH_DsSLHs80O1K_Cu0ZtDoMfQ8zkZGcBWQyG0ov8dwAi2pUm1g at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear Hotties,
>
> I've been periodically (every 3-6 months or so for 3 year) been posting in
> crisis mappers and HOT about using UAVs for mapping and other stuff. I'm
> really happy you guys are now talking about it!
>
> I've been looking at low-cost UAVs for a while now, and I think that
> technology has reached the maturity whereby we can instrument a rig with
> sensors for a total cost of less than 5 thousand dollars. Which means we
> can basically start shipping these to wherever VERY cheaply, with a HUGE
> impact! This is the state of technology TODAY imho.
>
> I'm immensely keen to contribute in substance to a white paper, a focus
> group and so on. And I'm even more keen to start actually fundraising,
> buying and instrumenting these in my back yard, at the lab or wherever, and
> to start shipping these to groups that can use them. I know a couple, and
> I'm sure you guys know of more that could use something like this.
>
> Civilian-led high-res imagery for civilian-initiatives : it's the crowd
> watching over itself - we're already here! Let's make this happen. Kindly
> consider me a ressource for however you're deciding to run with this. But
> let's run with this most definitely!
>
> Warm Regards,
>
> -Joseph.
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> ------------------------------
>
> Message: 3
> Date: Tue, 9 Jul 2013 21:35:24 -0500
> From: Andrew Buck <andrew.r.buck at gmail.com>
> To: Pierre B?land <pierzenh at yahoo.fr>
> Cc: hot <hot at openstreetmap.org>
> Subject: Re: [HOT] Meeting of the Togo Support Team - July 9, 2013
> Message-ID:
> <CAKV0ed1s0qdO7eF_3iJ3caqaiD8YihdFDBcdkmyd7pb_i_1TNQ at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> The translation of the two documents posted has now been completed and the
> results sent back to Togo. Thank you to Tom Taylor for his work
> translating the documents.
>
> -AndrewBuck
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> ------------------------------
>
> Message: 4
> Date: Wed, 10 Jul 2013 15:53:14 +0545
> From: amrit karmacharya <amrit.im at gmail.com>
> To: HOT at openstreetmap.org, osm at openstreetmap.org, Nama Budhathoki
> <namabudhathoki at gmail.com>, shashish maharjan
> <maharjan.shashish at gmail.com>, OpenStreetMap Community in Nepal
> <talk-np at openstreetmap.org>
> Subject: [HOT] Offset error in the newly updated Bing Imagery
> Message-ID:
> <CAGjVQ4sFOe9H6h7n98-iCBVzQwpotvJhhNtYygVi0gFTuaCVeA at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Over the last several months, we have mapped all the schools and health
> facilities here in Kathmandu, Nepal mostly visiting the ground with GPS.
> We, OSM Nepal Community, are now experiencing imagery offset error in the
> new Bing images (updated from 2/22/2011 to 11/22/2012) in Kathmandu,
> Capital of Nepal (27.699080 lat, 85.317337 lon) leading to positional
> displacement of all the mapped features. Although image offsets vary with
> places and terrain, the offset we now see seems to be beyond the acceptable
> limits. Could the new image be aligned to the existing data?
>
> Further, previous image had a bluish shade and was easier to identify
> features on image. The new imagery have greenish haze making it more
> difficult to identify features even to expert mappers. Can this issue be
> addressed as well?
>
> The Bing Imagery has been updated recently, just a few days ago we believe.
>
> Amrit Karmacharya
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> ------------------------------
>
> Message: 5
> Date: Wed, 10 Jul 2013 12:41:00 +0200
> From: Guttorm Flatab? <post at guttormflatabo.com>
> To: hot <HOT at openstreetmap.org>
> Subject: Re: [HOT] Offset error in the newly updated Bing Imagery
> Message-ID:
> <CADbOKhfFqY-WRLZrLCEMyMYdi2wFmfH6FgQuBnMZzU3X42Q94w at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Amrit,
>
> here in Norway we are well acquainted with poorly positioned Bing imagery.
> And similarly to Nepal (I presume) this is a big problem in areas where the
> elevation shifts frequently over short distances (in other words where it
> isn't just flat). It seems Bing isn't really adjusting their imagery to a
> digital elevation model. I have complained through Steve Coast who works at
> Microsoft/Bing and knows who to contact, but it does not seem to have
> helped. I'm hoping Mapbox will come to the rescue...
>
>
> 2013/7/10 amrit karmacharya <amrit.im at gmail.com>
>
> > Over the last several months, we have mapped all the schools and health
> > facilities here in Kathmandu, Nepal mostly visiting the ground with GPS.
> > We, OSM Nepal Community, are now experiencing imagery offset error in the
> > new Bing images (updated from 2/22/2011 to 11/22/2012) in Kathmandu,
> > Capital of Nepal (27.699080 lat, 85.317337 lon) leading to positional
> > displacement of all the mapped features. Although image offsets vary with
> > places and terrain, the offset we now see seems to be beyond the acceptable
> > limits. Could the new image be aligned to the existing data?
> >
> > Further, previous image had a bluish shade and was easier to identify
> > features on image. The new imagery have greenish haze making it more
> > difficult to identify features even to expert mappers. Can this issue be
> > addressed as well?
> >
> > The Bing Imagery has been updated recently, just a few days ago we
> > believe.
> >
> > Amrit Karmacharya
> >
> > _______________________________________________
> > HOT mailing list
> > HOT at openstreetmap.org
> > http://lists.openstreetmap.org/listinfo/hot
> >
> >
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> End of HOT Digest, Vol 41, Issue 25
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--
pozdrawiam - kind regards - cumprimentos - mfg
Łukasz Kruk
http://lukaszkruk.com
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