[OSM-dev] Data format for OSM annotation layers
crschmidt at metacarta.com
Sat Nov 25 15:01:02 GMT 2006
On Sat, Nov 25, 2006 at 01:45:10PM +0000, Nick Whitelegg wrote:
> Hello Dan,
> >> Those of you following the Freemap project will know that it includes
> >> annotation markers layer. It would seem to be a good idea to try and
> >> an annotations data format which could be used by OSM mashups in
> general, and
> >> develop an OpenLayers layer for it so that OSM mashups could easily use
> >> Maybe we could just use KML? (I take it that wouldn't violate any
> >> copyright issues?)
> >GeoRSS would be perfect for this, wouldn't it? Then you could allow
> >people to subscribe to updates in their area, and it'd be very
> >portable and could be used on many different systems. I'd say KML
> >would be a good addition to a GeoRSS feed, especially as Google
> >Earth/Maps seem to be resisting GeoRSS so far.
> My understanding of GeoRSS is that it is basically a geo-coded RSS format,
> i.e. it's good for (as you say) alerting people of updates on a map.
> However it doesn't really seem to be designed for bounding-box retrieval.
> The sort of app I had in mind involves the user panning an OSM slippy map
> and markers appearing as you move into new areas. Such an app would
> require a server which takes a bounding box and returns data of some sort
> representing the markers within.
Although this is true, WFS Simple is doing exactly this: taking the WFS
format, and changing the output to be encoded in GeoRSS. Starting off
from a script that just includes a bounding box should work ifne, and in
fact, many of the existing GeoRSS server support some kind of location
Using GeoRSS and adding in a bbox param seems to make perfect sense to
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