[gdal-dev] S-57 driver Generic attribute DSNM

[kusala nine]

DSNM is dataset name. I'ts defined in the DSID which only occurs in the
first field/subfield group in the dataset - not sure what the driver does
in respect of it. In terms of identifiers s-57 has "FOID"s, so each feature
has a unique id made up of a combination of the agency code  and two
integers. These are used to identify features and take the place of the
GUID, Foods don't repeat in a dataset but can represent a feature leaving
and entering a cell... Hope this helps.

Jonathan,.

On Sun, 3 May 2020 at 08:39, Andreas Oxenstierna <ao at t-kartor.se> wrote:

> Hi
>
> I have not checked the GDAL implementation but DSNM is an unneccessary
> addition to the S57 spec to generate a (potential unique) GUID.
> S57 spec has no GUID definition, IDs needs only be to unique inside a
> dataset/ENC cell.
>
> DSNM belongs to the dataset-wide DSID fields, see 6.3.2 in
> https://iho.int/uploads/user/pubs/standards/s-57/20ApB1.pdf
>
> > Hello,
> >
> > After reading this documentation concerning the S-57 driver :
> >
> > https://gdal.org/drivers/vector/s57.html
> >
> > I thought the attribute DSNM ( Dataset name) should be defined on all
> features, no ?
> >
> > But on the source code, the method S57GenerateStandardAttributes
> (s57featuredefns.cpp) always attaches theses standard feature attributes :
> > GRUP, OBJL, RVER, AGEN, FIDN, FIDS but there is no mention of the DSNM
> attribute.
> >
> > Is it a mistake in the documentation? In the code? Or just a
> misunderstanding on my side?
> >
> > Thank you for your clarification,
> >
> > -- loïc
> > _______________________________________________
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>
>
> --
> Best Regards
>
> Andreas Oxenstierna
> T-Kartor Geospatial AB
> Olof Mohlins väg 12 Kristianstad
> mobile: +46 733 206831
> mailto: ao at t-kartor.se
> http://www.t-kartor.com
>
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