2009/2/14 Andrew Chadwick (mailing lists) <[email protected]>: > Thomas Wood wrote: >> I've begun rectifying some of them by eye, but it really should be >> possible to transform them, since they are maps with a grid in a known >> projection (OSGB36, I assume).. >> All we theoretically need to do is map the image pixels to OSGB refs, >> then let a tool rectify them to whatever projection we want. > > Thanks for that - I made a little Perl script for doing the four > corners, http://osm.pastebin.com/f3fa44b1a , so all I'd have to do is > manually locate the corresponding corners on the original. Using > Geo::Coordinates::OSTN02 should make that as accurate as possible. > > The 1km square images are so big I'm having to crop and shrink them into > (NW, NE, SW, SE) quarters and upload them separately. Feed in a 4-figure > square ref like "SP5206" and it'll spit out the WGS84 (GPS) coordinates > of the four points at the corners for each one of these slices. Hope > that makes sense! > > I really wish warper allowed you to stitch multiple uploads from the > same source together into a scrollable, WMSable whole by tag or somesuch.
Great idea, and it's in the pipeline :-) Tim _______________________________________________ Talk-GB mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-gb
