> what's the best unite for creating a map ? > meters or degrees ? Just make sure you arent confusing units to display on a map with the projection? Choosing your projection is a more considerable question. Every flat map involves a projection to an xy plane so you cant have "degrees" on the map but you can display the degrees corresponding to mouse location on the map.
Projection questions for webmaps on OL begin with "are you using google maps?". If you then the projection is Google Mercator. If not, then are you using another raster base layer? If so then you must use the projection of that layer. If not, then questions about what map is for arise. Is preservation of shape more important than perservation of area? What portion of globe is to be covered etc. The projection "bible" - Snyder's "Map Projections - a working handbook" is very useful. Both depend on what use the map is for. I generally display degrees. The meters values depend on what projection was used and may or may not mean anything to the user. A distance tool can be used where meters or nmi are definitely more meaningful than degrees. Notice: This email and any attachments are confidential. If received in error please destroy and immediately notify us. Do not copy or disclose the contents. _______________________________________________ Users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/openlayers-users
