[Gdal-dev] OCI-geometry recognition

[Stephan Holl]

Hello Frank,

On Thu, 21 Sep 2006 10:02:05 -0400 Frank Warmerdam
<warmerdam at pobox.com> wrote:

> Stephan Holl wrote:
> >> This is not uncommon with different kinds of drivers, so if QGIS
> >> can't handle it, I think QGIS should be improved.
> > 
> > In what way? That it can deal with wkbUnknown or that it can
> > 'identify' the correct geometry by itself?
> 
> Stephan,
> 
> Well, I was thinking in terms of working with wkbUnknown in some
> reasonable way - even if it ends up having to scan some features to
> establish a type or ask the user if it really needs a single geometry
> type.  Note that there are drivers which return a mix of geometry
> types such as DGN, and potentially OCI.

I have digged into this and found out the following (using QGIS):

When loading a line-layer, I get this wkbtype: 2147483650
Debug: qgsvectorlayer.cpp: 3322: (drawFeature) 2147483650
File: qgsvectorlayer.cpp, Line: 3438: UNKNOWN WKBTYPE ENCOUNTERED
export to Wkt: LINESTRING (599410.286458709975705
4925218.247969940304756 0,599446.169775799964555 4925223.06831809040159
0,599667.214197290013544 4925284.553749489597976
0,599766.326235549990088 4925326.424210700206459 0)

Exporting this as WKT it says it is LINESTRING(x, y, z).

So the mystery-value of 2147483650 seems strange. Is this a bug in OGR?

Same applies to point and geometry layers:
WKB for points:   2147483649
WKB fr lines:     2147483650
WKB for polygons: 2147483651

?!

Thank you and TIA!

	Stephan

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