[Gdal-dev] GDAL shape file comes up with spurious lines using GDAL library

Frank Warmerdam warmerdam at pobox.com
Fri Jul 4 08:49:22 EDT 2003

Simon Ronald wrote:
> Hi guys,
> I am a developer from Petrosys in Australia, we make mapping software 
> for the oil & gas industry.  We are using GDAL to read in
> ESRI Shape files.  There is one shape file that looks ok when viewed in 
> the Arc Explorer program, but when read using GDAL the
> multiple line segments come through as a single LINESTRING with 55,000 
> points.  This means there are spurious connecting lines when viewed; 
> attached is a gif file of the way it looks :- a very strange impression 
> of the continent of Australia!
> I was wondering if any of you guys have come across this before and if 
> so if you can point me in the right direction for a fix.  I
> don't mind hacking GDAL - but if anyone has any sagely advice before I 
> hack forth.


On February 25th, 2003 I corrected a problem in the OGR shapefile driver
so that multi-part arcs would be read as MULTILINESTRING instead of as
a LINESTRING.  On June 10th I fixed it so they would also be written
properly.   I would suggest you upgrade to GDAL/OGR 1.1.9 and see if the
problem persists.

Best regards,
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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