[gdal-dev] MapInfo TAB append issue

[Daniel Morissette]

I can confirm that the MIF/TAB driver does not support append/update: it 
only supports read-only and write-only modes.

I'm not sure why OGR ends up writing a shapefile though. I would expect 
it to produce an error instead.

Daniel


King, Ross wrote:
> I'd say that's because OGR will use the drivers in order to 'guess'
> which driver to use to open the directory. I thought that the MapInfo
> driver was only read/write (ie no incremental update), so maybe it's
> dismissing the "MapInfo File" declaration as it's not able to append?
> You could try explicitly specifying the MapInfo file
> 'C:\Output\states.tab', rather than just using the directory.
> 
> Cheers
> 
> Ross
> 
> -----Original Message-----
> From: gdal-dev-bounces at lists.osgeo.org
> [mailto:gdal-dev-bounces at lists.osgeo.org] On Behalf Of Simon O'Keefe
> Sent: Monday, 19 April 2010 11:22 PM
> To: gdal-dev at lists.osgeo.org
> Subject: [gdal-dev] MapInfo TAB append issue
> 
> Hi,
> 
> I'd like to report some unexpected behaviour from ogr2ogr
> (FWTools2.4.7 in Windows 7) when attempting to append to a MapInfo TAB
> file.
> 
> To recreate this issue, I first run the following to create a new
> MapInfo table from a SHP file:
> ogr2ogr -f "MapInfo file" C:\Output C:\Input\states.shp
> 
> This successfully generates a MapInfo table at C:\Output\states.tab.
> 
> Now, I attempt to append the source data to the new table (not a
> realistic example, I know):
> ogr2ogr -f "MapInfo file" C:\Output C:\Input\states.shp -append
> 
> What happens here is that, instead of appending to the MapInfo table,
> it generates a new SHP file: C:\Output\states.shp.
> 
> I experience this behaviour whether the source is SHP or TAB. The
> slightly dangerous element to this issue is that if the input and
> output folders are the same, the source file (if it's SHP) gets
> appended to itself.
> 
> Has anyone experienced this issue?
> 
> Cheers,
> 
> Simon
> _______________________________________
> Simon O'Keefe
> Geospatial Systems Developer
> Groundtruth Mapping Systems
> Level 2, 140 Queen Street
> Melbourne VIC 3000 Australia
> phone:  +61 409 413 890
> email:  simon.okeefe at groundtruth.com.au
> web:    http://www.groundtruth.com.au
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-- 
Daniel Morissette
http://www.mapgears.com/