[Talk-ca] Map rendering errors

Bruno Remy bremy.qc.ca at gmail.com
Sun Nov 1 13:27:00 UTC 2015


The tile's rendering seems to be OK : I'v addes some items (trees) and they
appear on tiles.

I've also created ans deleted one driveway and the regeneration of new tile
keeps the "fantom driveway" anyway.
https://b.tile.openstreetmap.org/19/174623/186163.png

By the evidence, this is a database problem in osm2pgsql
<http://wiki.openstreetmap.org/wiki/Databases_and_data_access_APIs#Osm2pgsql>
schema , witch is used by Mapnik's rendering process.
The most probable hypothesis is : some old nodes and old ways still exists
in 'OldNode' and 'OldWay' tables, with the "visible" status as 'true'
instead of 'false'.
See the shema for reference:
http://wiki.openstreetmap.org/w/images/c/cd/RailsPortModels.png

My suggested solution:
Create a brand new collection of nodes with the position of "all fantom
nodes", and sending'them to the Tech tem of OSM. They'll be able to run a
query into the
'OldNode' and 'OldWay' tables and switch the "visible" status from 'true'
to 'false'.


Any others ideas/suggestions?

Bruno

2015-10-31 5:19 GMT-04:00 Pierre Béland <pierzenh at yahoo.fr>:

> The techs seem to have too many tiles to revise.  I dirtied the tile
> (addding suffix /dirty) and not corrected yet.
> http://c.tile.openstreetmap.org/19/174624/186164.png
>
>
> Pierre
>
> ------------------------------
> *De :* Bernie Connors <bernie.connors at unb.ca>
> *À :* talk-ca at openstreetmap.org
> *Envoyé le :* Samedi 31 octobre 2015 3h26
> *Objet :* [Talk-ca] Map rendering errors
>
> Hello,
>
>       I have done extensive editing with Potlatch2 for the Cape Breton
> University campus in Sydney, NS.  My son is a student at CBU and I have
> visited the campus several times.  The Bing imagery appears to be fairly
> recent and good quality.  The edits were completed more than one week ago,
> maybe two weeks but some of the map tiles still don't appear to match the
> vector data.  Here are some examples:
>  * Shannon School of Business building - it should be rectangular -
> http://www.openstreetmap.org/#map=19/46.16997/-60.09532
>  * Technology Centre building - shape does not match Potlatch2 vectors -
> http://www.openstreetmap.org/#map=19/46.17119/-60.09294
>  * Library building - there appears to be extra lines that could be ghosts
> of the previous vectors -
> http://www.openstreetmap.org/#map=19/46.17009/-60.09120
>
>       99% of the edits I made in this area are reflected in the
> OpenStreetMap tiles but the above items are a few examples where the map
> tiles do not match the vectors that I can see with Potlatch 2.  I am
> certain I have waited long enough for the OSM servers to update the tiles.
> Does anybody have an idea why the tiles do not match the vectors?
>
> Thanks,
> Bernie.
> --
> Bernie Connors
> New Maryland, NB
>
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-- 
Bruno Remy
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