[OSM-talk] Tiles at home Update

Dirk-Lüder Kreie osm-list at deelkar.net
Tue Mar 20 21:14:20 GMT 2007


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80n schrieb:

> It also utilises a pre-processor (called Frollo) which sorts out the
> ordering and direction of segments.  Segments that are mis-ordered or
> pointing in the wrong direction will no longer cause so much of a
> problem on the rendered tiles.  There should be a visible improvement
> in areas, where a mis-ordered segment could often cause great big
> triangular holes.  There should also be an improvement to the
> rendering of street names.  There should be fewer chopped up and
> inverted street names.
> 
> The Frollo pre-processor is designed specifically for use with
> Osmarender, but both Frollo and Osmarender can be used on their own.
> Frollo may be useful for anything that needs to have the segments
> sorted into a sensible order.  More details here:
> http://wiki.openstreetmap.org/index.php/Osmarender/Frollo

While I like the new osmarender styles and small fixes I'm against the
usage of this preprocessor for the tiles at home layer.
The errors should be fixed in the source data, not at the renderer.

Besides Frollo seems to have problems with it's max recursion in some
areas, like z12 2035 1350 where it also takes *ages* (step I ran for
more than 15 minutes CPU time, step II used 12 minutes) just to
"Frolloize" the data, not mentioning the enormous amount of RAM it uses
there.

Seeing how long my 1Ghz renderer takes for that tile I can load that
area manually and look for any inconsistencies (with mappaint plugin and
segment order numbers activated) concerning segment orientation and
ordering, upload again and render with Cambridge.

I'm seriously considering to disable Frollo on my clients at the least.
Wikipedia doesn't run a spellchecker on it's data, it's the users that
correct misspellings. OSM should work the same IMO.

Dirk-Lüder "Deelkar" Kreie


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