[gdal-dev] RFC 61: Call for vote on adoption

[Jukka Rahkonen]

Ari Jolma <ari.jolma <at> gmail.com> writes:

> 
> 
>     One more issue came up.
>     Shapefiles, which have Z will also have M, at least a placeholder
>     for it.
>     Having shapefiles as XYZM always in that case may be problematic.
>     It is possible to use the open options SHPT=type to override the
>     default. We could have Z => XYZ as default for backwards
>     compatibility and require open option for Z  => XYZM.
>     Ari09.02.2016, 17:07, Ari Jolma kirjoitti:

I noticed your changeset and I was just reading the shapefile specification.
I never knew that there are no separate XYZ and XYZM shapetypes. I also
believe I have never met a shapefile that really contains XYZM data.

I agree that the default should be to convert such shapefiles to XYZ instead
of XYZM. That would affect shapetype values

11 PointZ
13 PolyLineZ
15 PolygonZ
18 MultiPointZ

-Jukka Rahkonen-