It depends on what you want to use the map for: Do you show the whole world or a particular part of the world , and if so at what scale range? Do you need the map to be true to scale or true to form? Depending on all these questions you'd have to choose an appropriate projection. >From your enquiry I get the impression you want to make a map of the whole >world. In that case, UTM is not the best option, because it's a projection >that was designed for showing limited parts of the world, basically fitting >into one UTM zone, which is 6 degree of longitude. You can show the whole >world using any of these zones, but the more you are outside of the zone, the >bigger the distortions become. You can of course make a WMS layer for every zone and show each of these using the zone's UTM projection. You can start with any map, so one in latlon WGS-84 (4326) would work, you'll have your WMS software then reproject it into the projection you'd want. For some background to the projections, I'd recommend http://kartoweb.itc.nl/geometrics/ -- Barend Köbben International Institute for Geo-information Sciences and Earth Observation (ITC) PO Box 6, 7500AA Enschede (The Netherlands) ph: +31-(0)534874253; mobile: +31-(0)622344955
________________________________ From: Linda Rawson [mailto:[EMAIL PROTECTED] Sent: Mon 11/12/2007 23:29 To: Barend Köbben Cc: users@openlayers.org Subject: Re: [OpenLayers-Users] Need help understanding UTM What would I start with? A map in EPSG: 4326??? Would I add each zone layer individually? Do you do this in Mapserver or something like that so I only have 1 WMS layer? Thanks, Linda Rawson On Nov 12, 2007 12:51 AM, Barend Köbben <[EMAIL PROTECTED]> wrote: What exactly are you asking? > Is there anyway to get the map in meters and add > these layers for each zone? Of course, if you have any map in a knwon projection or in lat/lon, you can project it in any zone of UTM. So what is the problem...? -- Barend Köbben International Institute for Geo-information Sciences and Earth Observation (ITC) PO Box 6, 7500AA Enschede (The Netherlands) ph: +31-(0)534874253; mobile: +31-(0)622344955 ________________________________ From: [EMAIL PROTECTED] on behalf of Linda Rawson Sent: Sat 11/10/2007 03:47 To: users@openlayers.org Subject: [OpenLayers-Users] Need help understanding UTM I keep coming back to the fact I need a map layer that is a meter projection. In UTM there are several different projections: EPSG: 32611 EPSG: 32612 EPSG: 32613 These are based on zone. Whatever longitude you are at would determine the zone. Is there anyway to get the map in meters and add these layers for each zone? Thanks, Linda Rawson _______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users
