[gdal-dev] numeric values in VFK driver

[Martin Landa]

Hi,

there is an issue with VFK driver when interpreting numeric values.
Attribute type in VFK data is defined by string like

&BVLA;PODIL_CITATEL N30;PODIL_JMENOVATEL N30;

where VLA is layer name, N -> numeric; 30 -> width

Currently such data types are interpreted as bigint by the driver. But
the value can be apparently (tested almost on full Czech cadastre
dataset) larger that bigint in reality, eg.

&DVLA;...109690709117941111470877379;221486618060854273218000000;...

Such values are nonsense, but VFK driver has to read them. Currently
overflowed values are returned.

I can see only one option: switch to strings. So N30 will be treated
as string(30) by GDAL. Unfortunately it will influences (due to few
non-sense values mentioned above) important attributes like ID which
will be converted from bigint to text attributes.

By chance, anyone with better approach? Thanks a lot for pointers in advance! Ma

-- 
Martin Landa
http://geo.fsv.cvut.cz/gwiki/Landa
http://gismentors.cz/mentors/landa