On Thu, 2008-10-23 at 15:42 -0700, Dane Springmeyer wrote:
> Mapnik Users,
>
> I've run into a repeatable failure (on both mac 10.5 and Ubuntu 8.04)
> of the mapnik Filter expression and have a test case.
>
>
> You can download the test case as a zip archive from here:
>
> http://mapnik-utils.googlecode.com/svn/trunk/sandbox/mapnik_filter_failure_test_case.zip
>
> Inside the zip archive are two shapefiles, two XML mapfiles, and a
> test script.
>
> The run_test.sh script utilizes nik2img to generate a simple graphic
> using each mapfile.
>
> The only difference between the mapfiles is that one points to a
> 'states.shp' shapefile which mapnik renders fully green highlighting
> the failure of the <Filter> expression, while the other points to
> 'states_working.shp' which for me renders with states in shades of
> green, blue or red, highlighting a working Filter on the [PEOPLE]
> attribute.
The test script isn't working for me, but doing a simple binary
comparison between the files shows that only the dbf file are different.
We can discount the prj file since that is not read by Mapnik.
If I dump the the two dbf files with dbfdump (from shapelib utilities)
then the results are the same for the two files. The difference must be
in something very subtle like the padding bytes.
It either needs some extra debug code in the Mapnik shapefile reader to
compare exactly what is read from the two files. Or if someone is
familiar with the DBF format might be able to decode the differences
byte-by-byte.
Jon
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