tileindex: sequence of attributes in individual shapefiles matter s

[Bart van den Eijnden (OSGIS)]

Hi Steve,

okay, good to know tile4ms checks for this sort of thing, ogrtindex 
doesn't throw errors ...

Best regards,
Bart

Stephen Woodbridge wrote:

> Hi Bart,
>
> It does fetch by name from the first file that is opened but then 
> remembers the indexes. If you use tile4ms, this now checks for these 
> kinds of errors and trows and error. Mapserver can open 10 of 
> thousands of files when drawing a layer and this would add a lot of 
> additional overhead to fetch the column numbers based on names for 
> every file.
>
> I know it is a pain, but your should fix the data. It would not be 
> hard to write a little perl script to read the dbf file and reorder 
> the attributes.
>
> -Steve W
>
> Eijnden, B. van den (Bart) wrote:
>
>> Hi list,
>>
>> today we encountered that the sequence of attributes of the individual
>> shapefiles which were used in a tile-index are important. In 3 out of 4
>> shapefiles the CLASSITEM column was the 3rd column, but in the 4th 
>> shapefile
>> it was the 4th column, so that one did not show up in the map ....
>>
>> Apparently Mapserver fetches attribute values based on a column 
>> index? Would
>> it be better to fetch by name? Otherwise I think this requirement 
>> should be
>> documented somewhere.
>>
>> Best regards,
>> Bart
>>
>>
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-- 
Bart van den Eijnden
OSGIS, Open Source GIS
http://www.osgis.nl