[OSM-talk] OSM at Home (map tiles)

[Etienne]

On 10/7/06, OJW <streetmap at blibbleblobble.co.uk> wrote:
>
> On Saturday 07 October 2006 11:44, Etienne wrote:
> > When you grab data from the OSM server via the API it returns all
> segments
> > that cross the specified bounding box. Osmarender, by default,
> calculates
> > a new bounding box that includes all the segments returned from the API,
> so
> > this is usually bigger than the area requested.
>
> This will also become significant when we add hotspots to the maps, so
> that
> you can click on each restaurant for it's wikipedia article.
>
> The data I'm getting is from generator="OpenStreetMap server", and doesn't
> appear to include any bounds information.  So the options are:
>
> 1) get someone from the OSM website team to add bounds to the map API


The best option.

2) modify the downloaded file myself to store the bounding box that I
> requested (is there a wiki page somewhere saying what format to put it in)


http://wiki.openstreetmap.org/index.php/Osmarender#bounds


3) calculate the "actual" bounds of the returned OSM data (by looking at all
> the nodes) and use that to correlate positions on the image with their
> geographic coordinates.
>
> Other things:
> - Do the borders have any effect


They are rendered afterwards and so should not have any effect.  There is a
setting to turn them off.

- Do line-widths and end-caps have any effect when there's a wide road at
> the
> edge of the image


Since the edge is clipped this should be OK, but Osmarender isn't doing the
clipping properly yet (it makes a white border which you normally cannot
see).

- What inkscape options will be most reliable when rendering (presumably
> adding "bounds" information changes the "page size" in the SVG file, so I
> don't need the -D tag (entire drawing) any more?)


It would do if the clipping was done properly.  Don't really know if it will
be any better or different.



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