[gdal-dev] OGR - S57 - geometry extraction issue

[David Ferdoille]

Hello,


Thanks for the responses,



After a long afternoon of tests :

I try to access a WRECKS object, compose by an only point, with a QUAPOS
specific value of 5, and an POSACC of 500.0 (find it using CARIS Easy View)



1-

In ogrinfo -oo "RETURN_PRIMITIVES=ON" -oo "RETURN_LINKAGES=ON" -oo
"LNAM_REFS=ON" file.000 WRECKS, I found the object, but no QUAPOS or POSACC
(logical because the 2 attributes are not directly linked to the object,
but to the geometry).



2-

In ogrinfo -oo "RETURN_PRIMITIVES=ON" -oo "RETURN_LINKAGES=ON" -oo
"LNAM_REFS=ON" file.000 IsolatedNode, I found the node representing the
object but also no QUAPOS or POSACC.



3-

In ogrinfo -oo "RETURN_PRIMITIVES=ON" -oo "RETURN_LINKAGES=ON" -oo
"LNAM_REFS=ON" file.000 M_QUAL, I found an only object, spatially
containing my wreck object, but POSACC is null.



4-

In ogrinfo -oo "RETURN_PRIMITIVES=ON" -oo "RETURN_LINKAGES=ON" -oo
"LNAM_REFS=ON" file.000 M_QUAL, I found 20 objects, but QUAPOS is null for
all of them.



5-

No M_ACCY table is present in my dataset.





According to me, the good way to get these attributes, is the second one
(2-), but even if I try a lot of things, I didn’t manage to :

-          Trying all the S57 option with –oo

-          Trying to change the CSV types and attributes catalog used by
GDAL

-          Etc…





Does someone know if it is possible to get these attribute through GDAL/OGR
?

If not, is there another way to get this attributes (python GDAL scripts ?
another command line software ?)



Thanks again for your help !


Regards


David

2016-07-29 11:31 GMT+02:00 teddy guerin <teddyguerin at yahoo.fr>:

> Hi,
> Up for my previous answer.
> I was wrong for lines and area values POSACC, QUAPOS are on edges and not
> on "real object".
>
> Regards
> Ted
>
>
> ------------------------------
> *De :* David Ferdoille <david.ferdoille at gmail.com>
> *À :* gdal-dev at lists.osgeo.org
> *Envoyé le :* Mercredi 27 juillet 2016 15h12
> *Objet :* [gdal-dev] OGR - S57 - geometry extraction issue
>
> Hello all,
>
> We are trying to render S57 files as ENC through Geoserver.
>
> We convert S57 to shapefiles thanks to ogr2ogr : 1 shapefile for 1 class
> (ex : COALNE) and 1 geometry type (LINE) :
> ogrinfo -oo "RETURN_PRIMITIVES=ON" -oo "RETURN_LINKAGES=ON" -oo
> "LNAM_REFS=ON" CELLLL.000 COALNE
> ogr2ogr -skipfailures  -where "OGR_GEOMETRY='POINT' or
> OGR_GEOMETRY='MULTIPOINT'" SOUNDG_points.shp CELLLL.000 SOUNDG
>
> We use gdal-2.1.0 with the S57_CSV environnement variable
> (S57_CSV=/usr/local/share/gdal/ with s57*.csv files).
>
>
> We noticed that objects (of COALNE class for example) have multiple
> geometries and each sub-geometry have attributes like POSACC and QUAPOS
> which are important for S52 representation.
> We've succeeded to extract primitives (Edge, isolated points, connected
> points, ...), but it looks very complex to operate.
>
>
> We have some problems to extract geometries from s57 objects :
> - we noticed that, for an object, all sub-geometries are aggregated to one
> geometry
> - we didn't succeed to extract geometry attributes like POSACC and QUAPOS
>
>
> 1) Is there a way to not aggregate sub-geometries of an object and get
> this list of sub-geometries ?
> 2) Is there a way to extract geometry attributes like POSACC and QUAPOS ?
> 3) If not, are these features planned ?
>
>
> Thanks for your help !
>
>
> David
>
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>
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