Thank you very much Frank for the quick and clear answers. Best wishes, Yilmaz
On Tue, Sep 29, 2009 at 6:20 PM, Frank Warmerdam <warmer...@pobox.com> wrote: > Yilmaz Arslanoglu wrote: >> >> Hi; >> >> I had some questions regarding the additional feature of sounding >> point handling by the OGR library. >> >> I know that we need to turn on the options SPLIT_MULTIPOINT and >> ADD_SOUNDG_DEPTH options on. >> >> 1) Is there a way to turn them individually on without affecting the >> other suboptions in OGR_S57_OPTIONS ? >> Because if we do it by the following statement: >> >> CPLSetConfigOption("OGR_S57_OPTIONS", >> "SPLIT_MULTIPOINT=ON,ADD_SOUNDG_DEPTH=ON"); >> >> Then there is a possibility to overwrite the other suboptions >> UPDATES, RETURN_PRIMITIVES, >> PRESERVE_EMPTY_NUMBERS, LNAM_REFS, and RETURN_LINKAGES. > > Yilmaz, > > You are correct, calling CPLSetConfigOption() will clear the previous > setting, so if you want things amalgamated you need to do it > yourself in code in some fashion. > >> 2) With turning ADD_SOUNDG_DEPTH option on, the points become three >> dimensional, where the Z >> member variable contains the retrieved depth value I guess. Here, >> my question is, does this depth >> retrieval process take care of any unit conversions (meters, >> fathoms, feet, etc.) ? > > I do not believe it is doing any unit conversion. You will > get a Z coordinate in the depth units that it appears in > the depth attribute. > > In general OGR and OGRSpatialReference do not attempt to > address the units of Z values even though there is an OGC > coverage of compound (ie. 2D + elevation) coordinate systems. > > Best regards, > -- > ---------------------------------------+-------------------------------------- > I set the clouds in motion - turn up | Frank Warmerdam, > warmer...@pobox.com > light and sound - activate the windows | http://pobox.com/~warmerdam > and watch the world go round - Rush | Geospatial Programmer for Rent > > _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev