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I have an opportunity to go up in a hot air balloon to 300 ft over the area that I would like to map and to which I don't have access on the ground: this one. Is there a way I can use the photos I take during the ride in JOSM to map out the visible features? Are there any tips for producing best usable photos (as far as angling the camera, wide angle vs. telephoto, etc.)

asked 22 Apr '11, 18:23

ponzu's gravatar image

ponzu
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accept rate: 0%

I Googled "cheap flying camera" and there are quite a few. but how safe and how legal it is to overfly somewhere is something you will have to consider.

(02 Aug '14, 08:01) andy mackey

there is a mapper in the wiki (he's in central europe if I remember correctly,but the post was in english) that I've read about that's been using kites or model planes to hoist his camera.he will have some experience, if I can find it again I'll post a link, found it http://wiki.openstreetmap.org/wiki/Vertical_Aerial_Photographs

permanent link

answered 23 Apr '11, 18:31

andy%20mackey's gravatar image

andy mackey
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accept rate: 4%

edited 24 Apr '11, 12:08

We did a similar project in Stratford-upon-Avon in 2009, using a light aircraft. From that project my tips would be:

  1. Don't worry about getting precise vertical photos, but anything less than 70° to the horizontal isn't useful enough
  2. The longer the focal length of the lens the better (i.e. use telephotos). From the height you are flying you won't get much ground cover on each photo though.
  3. You need a few ground control points on each photo, so you'll probably need some physical feature with corresponding GPX tracks (e.g. a road with a few corners) in each photo.

When you have the photos, you can use the processes described in the link above to warp them and get them geo-referenced, and then import them into JOSM for tracing.

permanent link

answered 03 May '11, 09:37

Andy%20Allan's gravatar image

Andy Allan
11.5k23120140
accept rate: 30%

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question asked: 22 Apr '11, 18:23

question was seen: 8,274 times

last updated: 02 Aug '14, 08:01

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