Karsten Festag schrieb: > Hi Oliver, > > [...] > >> a bunch of formats. You can reference scanned paper maps with QLandkarte >> GT, too. I wrote a tutorial, but the example map I use has a strict >> copyright. Thus I am not able to switch it public. Still look for a nice >> map from the public domain. >> > > Maybe one of the historic maps from the wikimedia commons? > http://commons.wikimedia.org/wiki/Historical_maps?uselang=de > > For demonstration purposes I think the map don't need to be a current one. > > Just a proposal... >
You are right. Most historic maps are in the public domain these days. But they are of no use for explaining how to reference a map. A good map must have several properties: * A Cartesian grid of known type. Most free / historic / school maps use a Lambert projection / grid. Most commercial and recent maps use UTM (except the IGN of France. They love lambert :) ). * A known, well defined datum. For most free / historic / school maps you can just guess the datum. * Accuracy should be in the range of a GPS. And that's not even possible for some commercial maps. E.g. maps from the "Deutscher Alpenverein" (German Mountaineering Club) have up to 50m deviation. That is ok for hiking. But poor for a GPS. The map I use for that tutorial is a Tobacco map of the Dolomites. These maps are of a fantastic quality. But the copyright statement on them is more than obvious. Bad luck :( Oliver ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ QLandkarte-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/qlandkarte-users
