[gdal-dev] Inquiry about Elevation Values in DXF Conversion using ogr2ogr

Wed Jan 24 18:43:08 PST 2024

Hi Shahrukh,

Have you tried using the DXF_WRITE_HATCH configuration option documented https://gdal.org/drivers/vector/dxf.html?

For me, the following command creates a DXF that includes the elevations of individual vertices on the linestring:

ogr2ogr HKNW.dxf HKNW.kml --config DXF_WRITE_HATCH FALSE

This is a common pain point for users of the DXF driver. We might need to improve this part of the documentation, or consider changing the default value of DXF_WRITE_HATCH from TRUE to FALSE.

Regards,
Alan Thomas

From: gdal-dev <gdal-dev-bounces at lists.osgeo.org> On Behalf Of Shahrukh Mirza Nawandish via gdal-dev
Sent: Thursday, January 25, 2024 2:59 AM
To: Javier Jimenez Shaw <j1 at jimenezshaw.com>; Abel Pau <a.pau at creaf.uab.cat>
Cc: gdal-dev at lists.osgeo.org
Subject: Re: [gdal-dev] Inquiry about Elevation Values in DXF Conversion using ogr2ogr

Hi,

Thank you for your feedback. I appreciate your efforts in troubleshooting. When using Global Mapper and MicroStation, the elevation values were correctly preserved in the DXF conversion, while GDAL and QGIS didn’t.

24.01.2024, 18:47, "Javier Jimenez Shaw" <j1 at jimenezshaw.com<mailto:j1 at jimenezshaw.com>>:
If I remember correctly, DXF does not support multipolygons with different elevations.

On Wed, 24 Jan 2024 at 16:15, Abel Pau via gdal-dev <gdal-dev at lists.osgeo.org<mailto:gdal-dev at lists.osgeo.org>> wrote:

HI,

I’ve checked that your file is correct but for some reason DXF does not get this capacity of variable elevation.

Sorry for not being more helpful.

Exporting with QGis also doesn’t work.

Perhaps is a matter of the format itself. Have you tried with other files and did it worked sometime?

De: Shahrukh Mirza Nawandish <mirza.nawandish at haritaevi.com<mailto:mirza.nawandish at haritaevi.com>>
Enviado el: dimecres, 24 de gener de 2024 15:19
Para: Abel Pau <a.pau at creaf.uab.cat<mailto:a.pau at creaf.uab.cat>>
CC: gdal-dev at lists.osgeo.org<mailto:gdal-dev at lists.osgeo.org>
Asunto: Re: [gdal-dev] Inquiry about Elevation Values in DXF Conversion using ogr2ogr

Hi,

Thank you for your prompt response. I'm attaching the data file to this email for your convenience.

Appreciate your assistance.

24.01.2024, 17:02, "Abel Pau" <a.pau at creaf.uab.cat<mailto:a.pau at creaf.uab.cat>>:

Hi,

can you send us the file but not attached because it’s not allowed too much size in attachments.

Have you converted to another format to see if it’s a matter of KML or it’s general?

I’ll try to convert to MiraMon to test the elevations.

Thanks

De: gdal-dev <gdal-dev-bounces at lists.osgeo.org<mailto:gdal-dev-bounces at lists.osgeo.org>> En nombre de Shahrukh Mirza Nawandish via gdal-dev
Enviado el: dimecres, 24 de gener de 2024 14:13
Para: gdal-dev at lists.osgeo.org<mailto:gdal-dev at lists.osgeo.org>
Asunto: [gdal-dev] Inquiry about Elevation Values in DXF Conversion using ogr2ogr

Dear GDAL Team,

I hope this email finds you well. I'm encountering an issue when converting GeoJSON or KML files to DXF using ogr2ogr—specifically, the generated DXF file assigns a uniform elevation to all coordinates.

Your assistance in resolving this matter is highly appreciated.

Thank you,

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Saygılarımla / Kind Regards

Shahrukh Mirza NAWANDISH
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Yazılım Geliştirme Uzm. Yrd. / Software Development Assist. Specialist
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