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Hi Nick,<br>
<br>
Not exactly the answer that you wanted, but I would be very interested
if you develop this. I think it very worthwhile generally to have a
reference system where someone can serve specialist or just alternative
tiles for a specific bounding box, (country, city, whatever) and then
transparently fall over to another tile server(s) for a wider area,
such as the rest of the world. Is this the approach you are looking at?
I have got stuck at finding enough time to work out how to program an
OpenLayers script to do this. One other potential use for this is for
each community in disputed areas to show the "right" names on a map for
the area without the burden of supporting the whole world.<br>
<br>
Mike<br>
<br>
<br>
On 24/11/2011 15:00, Nick Whitelegg wrote:
<blockquote
cite="mid:OFA5529895.AD0F3147-ON80257952.004CEFE5-80257952.004CEFE5@solent.ac.uk"
type="cite"><font
face="Default Sans Serif,Verdana,Arial,Helvetica,sans-serif" size="2">Hello
everyone,<br>
<br>
Thought I'd email this as I have some thoughts as to how Freemap
(free-map.org.uk; countryside-orientated mapping for UK users) could
operate without excessive demands on a single server.<br>
<br>
Basically, I'm wondering if anyone has unused server space/bandwidth
allowances who might want to become part of a distributed Freemap. It
is a not-for-profit project, so there would be no financial comeback,
but just thought I'd ask in case anyone is interested in participating.<br>
<br>
<br>
The plan I have is something like this. Freemap aims to provide the
following services:<br>
* custom rendering of tiles for the whole of the UK, in a style geared
towards highlighting features for walkers (rights of way, permissive
paths etc) and distinguishing between physical properties of paths and
legal access rights (showing both as two layers, i.e. ROW status as
semi-transparent top layer)<br>
* add annotations (interesting views, path blockages etc) via web or
mobile interface<br>
* allow users to plan walks via web interface and then "play" walk
routes in the mobile app<br>
* a web service which provides POIs and OSM ways/polygons in a format
optimised for rendering. Queries can be by "Google tile" or by bounding
box in a range of projections. The underlying DB is the standard osm
postgis DB so the data is not generated in OSM format but in a format
which reflects the underlying DB structure. See for example <a
moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://www.free-map.org.uk/ws/trsvr.php?x=4079&y=2740&z=13">http://www.free-map.org.uk/ws/trsvr.php?x=4079&y=2740&z=13</a>.<br>
* a web service to deliver SRTM or OS LandForm Panorama data, no need
for any additional servers for this, I can handle this myself.<br>
(The web services are currently used by Android and WebGL clients to
render the data in 3D and to find nearby POIs)<br>
<br>
The distributed architecture I would have in mind is:<br>
<br>
* each server deals with a particular box within the UK<br>
* the master server (my own) would deal with dispatching requests to
the appropriate server depending on bbox<br>
<br>
The requirements of the other servers would be:<br>
* standard OSM postgis DB installed<br>
* osmosis and osm2pgsql installed<br>
* shell access for cron job updates<br>
* postgres DB to store height data, as per the relevant OSM wiki page:
consequently gdal needs to be present.<br>
<br>
I would supply:<br>
<br>
- Freemap source code, hopefully with some kind of installer<br>
- script to set up the Freemap-specific DB tables<br>
- cron scripts to fetch relevant data from Geofabrik on a regular basis
(every 2 weeks probably sufficient) and update the database.<br>
- relevant NASA SRTM height files <br>
<br>
If you are participating, feel free to suggest changes to the default
stylesheet (or even make them yourself!) and hack on the code.<br>
<br>
Would anyone be interested?<br>
<br>
Thanks,<br>
Nick<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
</font>
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