[gdal-dev] Support for S-100 and S-102

[kusala nine]

ah - the situation you're describing is subtly different. That's when you
have two 8211 fields concatenated together, so e.g the DSID/DSSI are
concatenated into a single 8211 record at the head of a standard S-57 ENC.

What I'm talking about is when a single 8211 field has repeating subfield
groups. So, for instance in an S-101 ENC the "Information Association field
" (INAS) has the specifier (in the record DDR)

*RRNM!RRID!NIAC!NARC!IUIN\\*NATC!ATIX!PAIX!ATIN!ATVL*

which represents a single set of RRNM,RRID,NIAC,NARC,IUIN subfields
followed by a set of potentially repeating NATC,PAIX,ATIN,ATVL fields.
These types of subfield specifiers simply don't exist in S-57 ENCs
(although I believe there are isolated examples in the S-57 defence
extension AML). And, of course fields are still concatenated togehter. The
good news is that the whole iso8211 layer is much better documented in the
S-101 spec and these specifiers make a lot more sense than the original
S-57 document. the issue I was describing is that records with these
repeating subfields aren't parsable with the current ogr based GDAL
libraries (I think, at least they weren't the last time I tried it).  Hope
that explains it better.... :-)

J

On 30 August 2018 at 14:29, Mike <mswope at gmail.com> wrote:

> The multiple field/subfields - I think gdal already does this for S-57 on
> DSID. It just prefixes the subfields with the field name.
>
> However -side note:  it seems the DSID_ISDT (issue date) is incorrect, it
> just has the same value as DSID_UADT (update application date).
>
> On Thu, Aug 30, 2018, 4:27 AM kusala nine <kusala9 at googlemail.com> wrote:
>
>> The biggest work item for S-100 compatibility would be an update to the
>> GDAL/OGR drivers for iso8211 in order to parse the S-101 iso8211 encoding.
>> S-101 is the candidate replacement for S-57 ENC data - so, at some point
>> all of NOAA's S-57 marine data will be available as S-101 datasets too.
>> There's various improvements in S-101 over the old S-57 standard including
>> dynamic feature catalogues and complex attributes on features but the main
>> issue is that the iso8211 encoding uses concatenated iso8211 data
>> structures (where you can have repeated field/subfields concatenated with
>> simple (i.e non-repeating ones)). The current GDAL I believe doesn't parse
>> these correctly so can't be used to parse S-101 data. I am invovled with
>> the IHO team developing the standard but the main data format/spec and
>> encoding are all pretty much done and there are converters/datasets
>> available if anyone is able to take on the work - not sure if there's NOAA
>> funding for it? It would be a huge step forward in the rollout to have an
>> open source parser for this data....
>>
>> Jonathan.
>>
>> On 29 August 2018 at 20:41, Even Rouault <even.rouault at spatialys.com>
>> wrote:
>>
>>> All,
>>>
>>> I've committed in GDAL master various improvements in the BAG driver,
>>> around
>>> two main directions:
>>> - read support for variable resolution BAG, with resampling and
>>> interpolation
>>> options
>>> - creating of (single resolution) BAG files from other GDAL datasets
>>>
>>> Updated documentation available at https://gdal.org/frmt_bag.html
>>>
>>> This work has been made possible through NOAA funding.
>>>
>>> Best regards,
>>>
>>> Even
>>>
>>>
>>> > I'd be happy to connect anyone with the folks at NOAA, CCOM-JHC, and
>>> > elsewhere who have been participating in drafting S-10x.  I only sat
>>> in on
>>> > a few of the meetings long ago.
>>> >
>>> > Specs should eventually end up here...
>>> > https://www.iho.int/iho_pubs/IHO_Download.htm#S-100
>>> >
>>> > On Thu, Jul 5, 2018 at 10:43 AM, Even Rouault <
>>> even.rouault at spatialys.com>
>>> >
>>> > wrote:
>>> > > Kelly,
>>> > >
>>> > > > I know GDAL/OGR supports S-57 format, but could not see where it
>>> > > > supports
>>> > > > S-100.
>>> > > >
>>> > > > Is there a plan to support the latest IHO S-100 and S-102
>>> standards in
>>> > >
>>> > > the
>>> > >
>>> > > > near future?
>>> > >
>>> > > I'm not aware of anyone working on that currently.
>>> > >
>>> > > I had difficulties finding concrete documentation about those
>>> standards
>>> > > (specification and test products). From my quick search, it looks
>>> like :
>>> > > - S-100 is a conceptual model,
>>> > > - S-101 is for ENC encoding, a successor of S-57. Apparently still
>>> using
>>> > > ISO-8211 for low level encoding.
>>> > > - S-102 is bathymetric grid encoding in GeoTIFF or in BAG. So should
>>> be
>>> > > already handled by GDAL
>>> > >
>>> > > Even
>>> > >
>>> > > --
>>> > > Spatialys - Geospatial professional services
>>> > > http://www.spatialys.com
>>> > > _______________________________________________
>>> > > gdal-dev mailing list
>>> > > gdal-dev at lists.osgeo.org
>>> > > https://lists.osgeo.org/mailman/listinfo/gdal-dev
>>>
>>>
>>> --
>>> Spatialys - Geospatial professional services
>>> http://www.spatialys.com
>>> _______________________________________________
>>> gdal-dev mailing list
>>> gdal-dev at lists.osgeo.org
>>> https://lists.osgeo.org/mailman/listinfo/gdal-dev
>>
>>
>> _______________________________________________
>> gdal-dev mailing list
>> gdal-dev at lists.osgeo.org
>> https://lists.osgeo.org/mailman/listinfo/gdal-dev
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20180830/0dce8ce0/attachment.html>