[gdal-dev] Data types change converting from MID/MIF to SHP

[pcreso at pcreso.com]

Hi,

I'm guessing this is because the DBF format ESRI decided on for aspatial attribute data in shapefiles does not have an integer datatype 

(sse: http://www.dbase.com/knowledgebase/int/db7_file_fmt.htm)

So an int field gets read into a generic numeric field in the DBF file, rather than an int.


Brent Wood


--- On Thu, 11/25/10, Zoltan Szecsei <zoltans at geograph.co.za> wrote:

From: Zoltan Szecsei <zoltans at geograph.co.za>
Subject: [gdal-dev] Data types change converting from MID/MIF to SHP
To: "gdal-dev" <gdal-dev at lists.osgeo.org>
Date: Thursday, November 25, 2010, 1:04 AM

Hi,
Here's a strange one that hopefully can be overcome quickly.

I'd be grateful for any assistance with this problem.

Kind regards,
Zoltan



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)
DATA

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.


Typical MID file entries are:

391,,,LINE,A
391,7553476,32986740,LINE,E
391,,,LINE,A
391,,,LINE,A
402,,,LINE,A
391,,,LINE,A
391,7552723,33180873,LINE,E
391,7553846,33193702,LINE,E
398,,,LINE,A
402,,,LINE,A
402,,,LINE,A
391,,,LINE,A
402,,,LINE,A
402,,,LINE,A
391,,,LINE,A
391,,,LINE,A
391,,,LINE,A
398,8181664,#017:1968,LINE,E
391,7586152,40306383,LINE,E
391,7645575,33201757,LINE,E
391,7586151,40306441,LINE,E
391,7586003,40307075,LINE,E
399,8396096,#017:1784,LINE,E






-- 
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Zoltan Szecsei PrGISc [PGP0031]
Geograph (Pty) Ltd.
P.O. Box 7, Muizenberg 7950, South Africa.

65 Main Road, Muizenberg 7945
Western Cape, South Africa.

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Tel: +27-21-7884897  Mobile: +27-83-6004028
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