openmap-users: Re: [OpenMap Users] TM Projection

>, >, Don/All >, Has anyone produced a Transverse Mercator Projection class for >, general use? >, I am trying to use the CSVTiledImagePlugin class to display some UK >, Ordnance Survey raster scanned maps. My problem is that the OM system >, does not have a TM projection class available and so when I try and >, put 2 tiles alongside each other, they mismatch by about .75 Km if I >, use any of the available projections. >, >, The OS maps are drawn using a Transverse Mercator projection on an >, airy spheroid (I'm sure you know that, Just clarifying!). >, >, I must admit, I thought that if I used the gnomonic projection I >, would get a better result, but it appears to be about the same. >, >, So first of all if someone has a TM class I could use I would be most >, grateful. >, >, Have I understood the principal of operation for these projections?? >, I.E. If I take an image of a map that has been produced with a common >, projection system and overlay it at the correct geographic coodinates >, on the OM system with the same projection, Would the maps >, goegraphically tie up with (a) each other and (b) Any vector map >, information that I have as standard already (I.E. VMapL0)?. >, >, >, ******************************************************************** >, This email and any attachments are confidential to the intended >, recipient and may also be privileged. If you are not the intended >, recipient please delete it from your system and notify the sender. >, You should not copy it or use it for any purpose nor disclose or >, distribute its contents to any other person. >, ******************************************************************** >, -- >, [To unsubscribe to this list send an email to 'majdart@bbn.com' >, with the following text in the BODY of the message 'unsubscribe >, openmap-users'] >, Source.


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