--- Chris H <[EMAIL PROTECTED]> wrote: > Greets: > > Im still stuck on trying to understand the issues with S-57 data files. From > discussions on IRC it seems that GQIS is hard coded to read only one layer at > a time, not multiple layers which makes this file format not supported at > this time. > > First off, is this assumption correct? Secondly if it is, is there a > workaround as I would like to use QGIS for a project Im planing. Finally if > S-57 is not supported at this time, would it be possible to be file an > enhancement request?
Hi Chris, I believe QGIS uses GDAL/OGR to access S-57 datasets. These data include a range of attributes not supported by common GIS formats, such as shapefiles, and the OGR support is (unfortunately) read only. Any issues with QGIS and S-57 access are probably better addressed in GDAL/OGR forums. One workaround would perhaps be to implement a PostGIS database essentially replicating your S-57 data, generated automatically or manually from the S-57 files, and use this to provide the data to be plotted by QGIS. I assume the issues with an S-57 writer is that many of the fields in this format are not easily derived from many other GIS formats, so a straightforward conversion is often not possible, thus a generic writer has not been implemented, making it difficult to move the PostGIS data back to S-57. Information about the support for S-57 provided by GDAL/OGR is at: http://www.gdal.org/ogr/drv_s57.html http://home.gdal.org/projects/s57/index.html I'm not a great fan of managing data in shapefiles, but they are a useful format for transferring data between applications. An application like the new CARIS S-57 composer, which can import shapefiles to generate S-57 files, might be useful, but is commercial software. Knowing Caris & GIS generally, it probably ain't cheap. An approach building & managing your data in PostGIS, then exporting to shapefile to build S-57 charts with the Caris software might be viable, and still much cheaper that a totally commercial solution. This would allow QGIS & most other FOSS GIS tools to interact with the data, for viweing, editing & managing it. http://www.caris.com/news/story.cfm?id=41 HTH, Brent Wood > > I rather new to this so apologies in advance if the assumptions are > incorrect. > Basically I just looking for some input on how to handle these file formats > with QGIS. > > Many thanks > > -- > /ch > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user > _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
