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

teddy guerin teddyguerin at yahoo.fr
Fri Jul 29 02:31:06 PDT 2016

Hi,Up for my previous answer.
I was wrong for lines and area values POSACC, QUAPOS are on edges and not on "real object".

      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 !

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