[gdal-dev] Data types change converting from MID/MIF to SHP
zoltans at geograph.co.za
Wed Nov 24 10:41:06 EST 2010
On 2010-11-24 16:12, Frank Warmerdam wrote:
> Zoltan Szecsei wrote:
>> Here's a strange one that hopefully can be overcome quickly.
>> I'd be grateful for any assistance with this problem.
>> Kind regards,
>> I have a MID/MIF file combination with:
>> COLUMNS 5
>> FEAT_TYPE_ integer (5)
>> GID integer (10)
>> ENTITY_NAM char (50)
>> GEOMETRY_T char (5)
>> AUD_MOD char (5)
>> yet as a SHP file, the two Integer fields become Real 11.0 - yes,
>> both 11.0
>> I have used both QGis 1.5.0 and an old MapInfo Imutgui.exe to do this
>> conversion, and I get the same results.
> I can confirm that OGR is ignoring the precision of integer fields when
> translating and thus "integer 5" is just treated as "integer". This in
> turn get translated to an 11 character wide field in the dbf file to
> hold the largest 32bit integer. But when reading back such a wide field
> the shapefile driver treats it as "real" since the largest 11 character
> wide integer is larger than 32 bits.
> In GDAL/OGR trunk I've changed the shapefile driver a few weeks ago so
> unknown width fields are treated as 10 wide integer fields which are
> treated as integer when read back in an effort to partly avoid this
> sort of
> problem. I'm not sure if that change was backported.
> But I think there is also an issue with the mapinfo driver which seems to
> be ignoring the precision of integer fields. I found it also ignores the
> precision of Decimal fields which are treated as real even if there are
> no decimal points.
> Could you file a ticket in the GDAL/OGR Trac on this? I'll try to get it
> fixed up for GDAL/OGR 1.8.
> Best regards,
I've filed ticket #3853 - thanks.
I'm obviously available to help where possible.
Zoltan Szecsei PrGISc [PGP0031]
Geograph (Pty) Ltd.
P.O. Box 7, Muizenberg 7950, South Africa.
65 Main Road, Muizenberg 7945
Western Cape, South Africa.
34° 6'16.35"S 18°28'5.62"E
Tel: +27-21-7884897 Mobile: +27-83-6004028
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