Re: [OSM-talk] Small village high detail low angle orthorectification
On Sun, Jun 13, 2010 at 2:46 PM, Tristan Scott trs...@gmail.com wrote: Does anyone have experience of this, who could point me in the direction of the appropriate JOSM plugin, or external software? I have Linux (Gentoo) and Windows XP on systems used for mapping. This must be a fairly common issue for mappers, right? It's not very common, but it's certainly something that's been done before. Have a look at http://wiki.openstreetmap.org/wiki/Stratford-upon-Avon/Imagery From the sounds of your email the photos aren't going to be much use though - they need to within 30° of the vertical really. Otherwise it's just the same effect as looking at the photo and mentally warping them (just making judgement calls as to roughly what goes where). You'll notice the problems when you have 3+ overlapping photos. Also, try to avoid warping against OSM data, and especially don't change OSM data to match any images that have been warped using the same OSM data. It's very tempting and easy to do but you end up chasing your own tail! Cheers, Andy ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Small village high detail low angle orthorectification
On 13 Jun 2010, at 6:46 , Tristan Scott wrote: Does anyone have experience of this, who could point me in the direction of the appropriate JOSM plugin, or external software? I have Linux (Gentoo) and Windows XP on systems used for mapping. Qgis is good for that. you can download or import osm data and rectify by choosing points from osm data. didnt't manage to edit any osm data directly in osm. instead create a new layer, export as shape and convert to osm for editing in josm. but this is not very accurate and can be used only with a lot of guessing and local knowledge This must be a fairly common issue for mappers, right? Tristan Scott BSc(Hons) Yare Valley Technical Services 07837 205829 01603 858441 ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
[OSM-talk] Small village high detail low angle orthorectification
I happen to know a chap who has quite a lot of aerial imagery of Norfolk villages. Because he publishes the images, I cannot release the images to the public or to other mappers, but I can use them myself to generate mapping data. Some of the uses I have in mind is to map landuse in villages and missing roads, for villages where most of the roads have already been gps-mapped, giving lots of known points to perform the rectification from. Now, the images are taken at quite a low angle, so I'll need to recify them using software, ideally some sort of orthorecification thing in JOSM, if such is availiable. The tranform will be a basic trapezoid shape, but with a bottom probably half as long as the top (so the image taken at 45 degrees) possibly with slightly bowed sides for any barrel distorion in the lens. Obviously this will only work from items on the flat plane, but handily that pretty much describes norfolk. Does anyone have experience of this, who could point me in the direction of the appropriate JOSM plugin, or external software? I have Linux (Gentoo) and Windows XP on systems used for mapping. This must be a fairly common issue for mappers, right? Tristan Scott BSc(Hons) Yare Valley Technical Services 07837 205829 01603 858441 ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Small village high detail low angle orthorectification
Maybe Map Warper http://warper.geothings.net/ can help you. --Ciprian On Jun 13, 2010 4:50 PM, Tristan Scott trs...@gmail.com wrote: I happen to know a chap who has quite a lot of aerial imagery of Norfolk villages. Because he publishes the images, I cannot release the images to the public or to other mappers, but I can use them myself to generate mapping data. Some of the uses I have in mind is to map landuse in villages and missing roads, for villages where most of the roads have already been gps-mapped, giving lots of known points to perform the rectification from. Now, the images are taken at quite a low angle, so I'll need to recify them using software, ideally some sort of orthorecification thing in JOSM, if such is availiable. The tranform will be a basic trapezoid shape, but with a bottom probably half as long as the top (so the image taken at 45 degrees) possibly with slightly bowed sides for any barrel distorion in the lens. Obviously this will only work from items on the flat plane, but handily that pretty much describes norfolk. Does anyone have experience of this, who could point me in the direction of the appropriate JOSM plugin, or external software? I have Linux (Gentoo) and Windows XP on systems used for mapping. This must be a fairly common issue for mappers, right? Tristan Scott BSc(Hons) Yare Valley Technical Services 07837 205829 01603 858441 ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Small village high detail low angle orthorectification
Tristan Scott wrote: I happen to know a chap who has quite a lot of aerial imagery of Norfolk villages. Because he publishes the images, I cannot release the images to the public or to other mappers, but I can use them myself to generate mapping data. If you can't release the imagery to other OSM mappers, then are you sure you can derive OSM data from it? Cheers, Chris ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Small village high detail low angle orthorectification
2010/6/13 Tristan Scott trs...@gmail.com: Now, the images are taken at quite a low angle, so I'll need to recify them using software you will always need to rectify and align / project them, but if they're taken from a very low angle that's a bad basis for our needs. Good luck, Martin ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Small village high detail low angle orthorectification
see here http://www.openstreetmap.org/user/h4ck3rm1k3/diary/10219 On Sun, Jun 13, 2010 at 4:50 PM, Ciprian Talaba cipriantal...@gmail.com wrote: Maybe Map Warper http://warper.geothings.net/ can help you. --Ciprian On Jun 13, 2010 4:50 PM, Tristan Scott trs...@gmail.com wrote: I happen to know a chap who has quite a lot of aerial imagery of Norfolk villages. Because he publishes the images, I cannot release the images to the public or to other mappers, but I can use them myself to generate mapping data. Some of the uses I have in mind is to map landuse in villages and missing roads, for villages where most of the roads have already been gps-mapped, giving lots of known points to perform the rectification from. Now, the images are taken at quite a low angle, so I'll need to recify them using software, ideally some sort of orthorecification thing in JOSM, if such is availiable. The tranform will be a basic trapezoid shape, but with a bottom probably half as long as the top (so the image taken at 45 degrees) possibly with slightly bowed sides for any barrel distorion in the lens. Obviously this will only work from items on the flat plane, but handily that pretty much describes norfolk. Does anyone have experience of this, who could point me in the direction of the appropriate JOSM plugin, or external software? I have Linux (Gentoo) and Windows XP on systems used for mapping. This must be a fairly common issue for mappers, right? Tristan Scott BSc(Hons) Yare Valley Technical Services 07837 205829 01603 858441 ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
