Re: [Talk-GB] Surrey air survey
On 30 Apr 2010, at 11:48, Andy Allan wrote: On Fri, Apr 30, 2010 at 9:23 AM, TimSC mapp...@sheerman- chase.org.uk wrote: But it would be worth checking what strings are attached to the data by the licensing. Well, the licensing is pretty clear - it's been given to us under the ODbL. Anyone feel qualified enough to suggest what that means? However, the new owners of the imagery gave us it to use for tracing, so I'm pretty sure any licensing issues are solvable technicalities, so I'd say crack on with using it. ITO provided some modest financial support to assist with the release of this data. Our understanding was that the use would be pretty much un-restricted (it was flown by a company that has ceased to trade). If ODbL is not suitable (and I am not sure that it is for imagery) then it might still be possible to adjust the license. What would we want? Personally I would prefer CC0. Btw, how does one access the imagery? It there a magic URL that I have missed; also, does the dataset have a wiki page? Regards, Peter Cheers, Andy ___ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb ___ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
[Talk-GB] Surrey air survey
Hi, I agree that the surrey air survey will be an amazing resource. But it would be worth checking what strings are attached to the data by the licensing. And also we need to consider the implications with our CC-BY-SA and ODbL situation. I have added a wiki page as a place holder. We need to agree as to which source tag to use. http://wiki.openstreetmap.org/wiki/Surrey_Air_Survey Regards, Tim ___ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
Re: [Talk-GB] Surrey air survey
On Fri, Apr 30, 2010 at 9:23 AM, TimSC mapp...@sheerman-chase.org.uk wrote: But it would be worth checking what strings are attached to the data by the licensing. Well, the licensing is pretty clear - it's been given to us under the ODbL. Anyone feel qualified enough to suggest what that means? However, the new owners of the imagery gave us it to use for tracing, so I'm pretty sure any licensing issues are solvable technicalities, so I'd say crack on with using it. Cheers, Andy ___ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
Re: [Talk-GB] Surrey air survey
On 30/04/2010 11:48, Andy Allan wrote: However, the new owners of the imagery gave us it to use for tracing, so I'm pretty sure any licensing issues are solvable technicalities, so I'd say crack on with using it. That's exactly what I've been doing. However, I've noticed a varying amount of agreement between the imagery and traces I've taken over the years. Sometimes it's bang on, sometimes there's up to 5 metres of difference between the two. I realise this could be down to the traces being inaccurate, but I've seen places where the average of many tracks still doesn't quite match the imagery. If I get the chance I'll take some reference points around Guildford that are easily identified on the images to see how far they're out, if at all. If I do manage this, is there any way of using the information to reproject the images? -- Jonathan (Jonobennett) ___ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
Re: [Talk-GB] Surrey air survey
By the looks of the imagery edges, it's made up out a of a huge number of small images that seem to have very odd alignments. I would guess form my experiance that the imagery has a general error where there is an offset that covers the whole set, or large swathes of it, caused by GPS drift, or other similar consistant issues -- this is (teoretcially) fairly simple to correct for, given a decent amount of reference points. But indevidual images likelly have an error in them too, and this would be very tricky to correct for without taking an inordinate number of points, and then correcting the pre stiched base images, I don't think we have access to this, do we? so the answer is sort of, in theory in practice: if anyone has found a piece of software that will take a large volume of image data and reproject it, please share. JR On 30 April 2010 15:52, Jonathan Bennett openstreet...@jonno.cix.co.uk wrote: On 30/04/2010 11:48, Andy Allan wrote: However, the new owners of the imagery gave us it to use for tracing, so I'm pretty sure any licensing issues are solvable technicalities, so I'd say crack on with using it. That's exactly what I've been doing. However, I've noticed a varying amount of agreement between the imagery and traces I've taken over the years. Sometimes it's bang on, sometimes there's up to 5 metres of difference between the two. I realise this could be down to the traces being inaccurate, but I've seen places where the average of many tracks still doesn't quite match the imagery. If I get the chance I'll take some reference points around Guildford that are easily identified on the images to see how far they're out, if at all. If I do manage this, is there any way of using the information to reproject the images? -- Jonathan (Jonobennett) ___ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb ___ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
[Talk-GB] Surrey air survey
Anyone know where we are with this? http://opengeodata.org/surrey-county-air-survey http://opengeodata.org/surrey-county-air-surveyCheers, Wilf. m...@home ___ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
Re: [Talk-GB] Surrey air survey
On 29/04/2010 09:10, Graeme Wilford wrote: Anyone know where we are with this? http://opengeodata.org/surrey-county-air-survey Graeme, Sorry -- I've been meaning to write this up on the wiki. Gravitystorm has created a set of tiles for z19 using the imagery. The tiles are available at: http://gravitystorm.dev.openstreetmap.org/surrey/!/!/!.png if you know how to add that to the editors -- if not I'll write some proper instructions real soon now. They haven't been added to the preset backgrounds on Potlatch, so you'll need to add them by hand if that's your editor of choice. The imagery itself is very good. I've seen a few places where it doesn't quite match with my GPX traces, but enough places where it does to trust it in the majority of places. Needless to say, you should only trace an are you know well or can visit, since there's no way of identifying many features just from the images. But for where you've mapped already, it's fantastic. -- Jonathan (Jonobennett) ___ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
