[Tilesathome] Low Zoom

[80n]

Spaetz
The script lowzoom_composite.pl was able to merge in the caption layer.  It
was being used for zooms 8 through 11 and was working very nicely for z8
through z11.

There is a small projection bug in osma which becomes noticeable below z8,
so captions were not being included for z0 to z7.

Some more info here:
http://wiki.openstreetmap.org/index.php/Tiles%40home/lowzoom

I think lowzoom now runs in two passes, z0-z5 and z6-z11.  While the
projection bug in osmarender is still there, it would be reasonable to merge
captions for z6-z11 but not for z0-z5.

80n


On Wed, Jul 16, 2008 at 5:51 AM, spaetz <osm at sspaeth.de> wrote:

> On Tue, Jul 15, 2008 at 02:54:22PM -0700, Alan Millar wrote:
>
> > I believe the pale color is not intentional but just an artifact of the
> > current basic scaling, waiting for one of us to fix it :-)
>
> That sums it upp pretty nicely. I just made it look ugly, to increase the
> pressure on you to submit patches :-))
>
> > I think the
> > current stitcher also does not composite the lowzoom captions on, at
> least
> > when I checked a day or two ago.
>
> I don't think the "old" stitcher did that, did it? I thought we were all
> still waiting for someone to sort out the projection issues in osma, so that
> captions were actually were the corresponding cities were :-).
>
> > I'm in the process of setting up a test tile server environment of my own
> > so I can help develop fixes for this.  There are a number of hardcoded
> > items and dependencies which are not obvious at first.  I'm making notes
> > as I go along.
>
> Allan, much appreciated. I would like to remove as much hardcoded things as
> I can (if performance of tile serving doesn't suffer too much). If there are
> other dependencies we should add them to the INSTALLATION instructions. You
> do have an SVN account, so feel free to change the INSTALL doc, or add other
> documentation files.
>
> >  And then there is that problem of me not knowing python,
> > django, or cairo.  Well then, it's time to get started...
>
> The usage of Cairo is pretty primitive (exclusively used for stitching), we
> could easily switch to PIL (python imaging library), although I guess that
> that wouldn't really help you :-). Any other language could also be used,
> although python is easiest as it has access to the PNG data of tiles without
> needed to use a command line client. Although it would be kind of trivial to
> write a tile extractor in perl too.
>
> spaetz
>
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