[gdal-dev] patch: s57objectclasses.csv for distance marks from IENC [add wtwdis; unlocd]

[kusala nine]

These are features and attributes from the Inland ENC catalogue which is an
S-57 product specification similar to ENC - basically ENCs for inland
waterways. unlocd is UN Location Code, the unique identifier of a port and
wtwdis is "waterway distance" - both from the IENC product specification.
The clue is lower case - ENC features and attributes are always upper case,
INFORM, OBJNAM, LNDARE etc etc... So, I think it's fine to add these as the
S-57 driver needs to understand the different object ids and what they
represent. In the next version of the product specification the feature
catalogue will be embedded into the header of the iso8211 file (IHO S-101
which will replace S-57 in time). If anyone's interested in doing the
iso8211 parser for it (it uses concatenated data structures and like AML,
can't be read natively by existing GDAL drivers) I'm happy to help out -
the C++ is a tad beyond me right now but I'm aware the IHO momentum behind
S-101 particularly is picking up speed so it would be worth thinking about
at some point :-)

cheers,

JP

On Thu, 19 Dec 2019 at 12:07, Even Rouault <even.rouault at spatialys.com>
wrote:

> On jeudi 19 décembre 2019 12:46:05 CET wulf wrote:
> > Hi developers,
> >
> > attached, there is a patch for
> >
> > s57objectclasses.csv against git commit 94431c2
> >
> >
> > 191c191
> > < 17004,Distance
> >
> mark,dismar,catdis;wtwdis;unlocd;DATEND;DATSTA;NOBJNM;OBJNAM;,INFORM;NINFOM
> > ;NTXTDS;PICREP;SCAMIN;TXTDSC;updmsg;,SORDAT;SORIND;,G,Point; ---
> >
> > > 17004,Distance
> > >
> mark,dismar,catdis;DATEND;DATSTA;NOBJNM;OBJNAM;,INFORM;NINFOM;NTXTDS;PICR
> > > EP;SCAMIN;TXTDSC;updmsg;,SORDAT;SORIND;,G,Point;
> > I'm not competent if this is a correct solution, but with that version
> > I'm able to extract the needed values.
>
> Can you submit this as a pull request by editing
> https://github.com/OSGeo/gdal/blob/master/gdal/data/s57objectclasses.csv
> (possibly directly from github UI ?)
>
> So you've added
> ;wtwdis;unlocd
>
> Is that right ?
> Where does this come from ? I can't see that on http://www.s-57.com/ . Or
> are
> they specific to the particular profile of S57 you use ?
>
> --
> Spatialys - Geospatial professional services
> http://www.spatialys.com
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