[gdal-dev] Shapefiles and z dimensions

[Ari Jolma]

Nyall Dawson kirjoitti 09.12.2017 klo 18:04:

> Hi all,
>
> I'm trying to track down some odd behaviour in QGIS, and determine
> whether this is a qgis bug, gdal bug, or shapefile limitation.
>
> If I create a new shapefile layer using GDALDatasetCreateLayer, with a
> geometry type of wkbPoint25D (actually any of the 25D) types, then the
> resultant layer ALWAYS has an M dimension present as well (i.e.
> ogrinfo reports PointZM type).
>
> Is this expected behaviour for shapefiles?

It is expected. Shapefiles are XY, XYM, or XYZM

https://www.esri.com/library/whitepapers/pdfs/shapefile.pdf

Ari

>
> Nyall
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