On 18/01/2008, Tom Hughes <[EMAIL PROTECTED]> wrote: > > why is this an issue? i would assume the link has to appear whenever > > some of their data is displayed on screen? setting a tag to some > > value, that then triggers a link to display at bottom-right should not > > be too much of an issue. or is it some non-technical issue? > > I take it you're volunteering to write the code to track changes > to tags and update a database that maps bounding boxes to attribution > strings and then allows a set of strings to be retrieved on the fly > to display over the slippy map as you move it?
not necessarily, i was asking the question to prompt some discussion over the problem and some solutions. i'd love to do it, lots of ideas in my head, but time is finite > What do you propose to do when zoomed out to show the whole world > and there are three hundred attribution strings to display by the > way? It might be quite hard to see the map with them all displayed... well, the serious answer to a flippant question begins with asking if we can get away without showing them at these zoom levels? there's no discernible/usable data at these levels - it appears to be turned off by the renderers, so we can easily get away without showing it. i had a quick look at google maps, gradually zooming out step-by-step, and this appears to be what they do. there's only one attribution string for world and look for yourself at the main osm map zoomed out to 'world' - nothing shows except land, sea and country boundaries. no data = no attribution string roads start showing at zoom level 5, so this would be a better place to start looking at how many attribution labels there would be on screen at one time. and realistically, there are only going to be a small number of compatible data sets that are usable, most are released under very restrictive licenses, so the list of attribution strings will never be that high - how many are there so far that are being considered? _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
