Labels placement for polygons are different for PostGIS and Shapefile datasources

[Andrey-VI]

Same style

<TextSymbolizer size="10.0" fill="#5495ff" face-name="Open Sans Italic" halo-radius="1.0" halo-fill="#faf9f554" character-spacing="1.0" wrap-width="32">[FULLNAME]</TextSymbolizer>

same data (polygons). But in the first case data in Shapefile format, in second case — from PostGIS database.
And… very different label placements for most of polygons.
Shapefiles:

PostGIS:

If I add placement="interior" option in style with PostGIS datasouce I get this:

Note that label with оз. Марья-Шелека text is still missing.

P. S.: I'm using Mapnik layer-opacity branch

[springmeyer]

Please post test data.

[Andrey-VI]

Hi Dane!
http://91.208.39.38/~andrey/tiles/temp/tc_labels.zip
Testcase with real data and style for zoom level 10 only.
Command for PostgreSQL:
createdb rumap_tc && pg_restore -d rumap_tc -Fc -O -x /path/to/folder/tc_labels/rumap_tc.dump

P. S.: I'm using mod_tile/renderd for rendering maps.

[springmeyer]

Thanks, I will take a look on Monday. Can you also share which labels you think are correct and which you think are wrong? And also a nik2img.py command to replicate (with extent).

[Andrey-VI]

Only labels generated from shapefiles looks correct for me.

About nik2img.py. I have no success with it (see mapnik/mapnik-support#4). Sorry.
Extent of the map: 3286000,9494000,3577000,9631000

[springmeyer]

@Andrey-VI - thanks for the testcase: it was easy to replicate with. I quick see one workaround but to decide on the proper I need to share the testcase with @artemp so I reduced it down and created a new issue to directly clarify the bug at #2078.

In the process I also wrote up a guide to creating testcases: https://github.com/mapnik/mapnik/wiki/A-perfect-testcase. Yours was great, but could have been even better, so I wanted to get you thinking about this.

closing in favor or #2078.

[Andrey-VI]

@springmeyer, thanks for the guide!