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From ARCGEN (Esri ArcInfo Generate) I want to create a DXF with distinguishable layers: import_polz.pol

enter image description here

The transformation to a three-dimensional shapefile runs flawlessly with gdal ogr2ogr:

ogr2ogr  -f "ESRI Shapefile"  export_lin.shp  -nlt LINESTRING -dim 3  import_polz.pol; ogrinfo -so -al export_lin.shp

or

ogr2ogr  -f "ESRI Shapefile"  export_pol.shp  -nlt POLYGON -dim 3  import_polz.pol; ogrinfo -so -al export_pol.shp

In the DBF, the ID assignments (ID,N,9,0) are correctly transferred with 1 and 2006, 2016, etc.

However, the conversion to a DXF file fails because of the assignment of the attributes to the layers:

ogr2ogr  -f "DXF"  export_lin.dxf  -nlt LINESTRING -dim 3  import_polz.pol; ogrinfo -so -al export_lin.dxf

The response looks like this:

ERROR 1: DXF layer does not support arbitrary field creation, field 'ID' not created. INFO: Open of export_lin.dxf' using driver DXF' successful. Layer name: entities Geometry: Unknown (any) Feature Count: 390 Extent: (0.000000, 0.000000) - (150.000000, 20.000000) Layer SRS WKT: (unknown) Layer: String (0.0) PaperSpace: Integer(Boolean) (0.0) SubClasses: String (0.0) Linetype: String (0.0) EntityHandle: String (0.0) Text: String (0.0)

In the forum I could only find the ten year old hint that the DXF format is complicated: Errors when converting MapInfo .tab to .dxf

However, a newer version of ogr2ogr now seems to know how to assign layers: https://gdal.org/drivers/vector/dxf.html#dxf-writer

However, I have no success with the instructions. Does anyone know how to assign the polygon ID to a DXF layer?

A solution with gdal or QGIS3 is desirable.

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  • >"DXF layer does not support arbitrary field creation" To my knowledge only the geometry can be converted. It is not possible to transfer attributes to a DXF.
    – Mike
    May 16 at 7:24
  • The field 'ID' is probably a default value and is used by ogr2ogr for example in "export_lin.dbf". Source: c. "This is really a dummy as our fields are precreated." But according to source the variable "poFeatureDefn" must be defined to address a layer. Apparently this is also possible via -sql statement: converting-a-csv-to-dxf-using-ogr2ogr-from-the-command-line. Is anyone familiar with this?
    – Chris Naujoks
    May 17 at 2:30
  • I don't quite understand your problem. This error message is more of a warning. The DXF should still be generated.
    – Mike
    May 17 at 6:16
  • The geometric elements have an ID. Layers can be defined in a DXF. For example, in the image above, a color corresponds to an ID or a layer. The correct assignment of the ID to a layer in a DXF would solve my problem.
    – Chris Naujoks
    May 17 at 9:16

1 Answer 1

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If you want to convert the ID column into a DXF layer, then you can use this code:

ogr2ogr -dialect sqlite -sql "SELECT  ID as Layer,  geometry from import_polz" ^
        -f "DXF"  export_lin.dxf  -nlt LINESTRING -dim 3  import_polz.pol
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  • That's great. Many thanks to Mike.
    – Chris Naujoks
    May 17 at 13:04

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