[GRASS5] r.in.png error?

[Hamish]

> > However, it's debatable whether you should be re-importing images
> > which were created using the PNG driver into GRASS. For
> > zooming/panning around a map (or series of maps), you would normally
> > create a new PNG file each time, by the same means that the original
> > PNG file was created.
> 
> Ideally, this would be the case, but some of the data files are large
> areas such as continents. I'd like to be able to show the world first,
> then the user click on any place in the map and it zooms into an area
> such as a continent or perhaps something a little closer (at some
> point I imagine I'll have to create another higher resolution map of
> that area as they get closer). As they keep clicking, they zoom in
> closer and closer until they get to a country or state or city. Then I
> will give them information on that area such as official bird, tourist
> landmarks, or other items of interest. I'm a beginner at this, so I
> could be going about it totally wrong.  I'm open for suggestions
> though.


UMN Mapserver sounds like what you want..?
http://mapserver.gis.umn.edu/
(check out the gallery)

interface with GRASS:
http://grass.itc.it/start.html


good luck,
Hamish