All, This is very useful, thanks. The S57 driver does appear to give the layers by names that I recognize:
INFO: Open of `C:\collab\dasktest\data_dir\13238_FFF.000' using driver `S57' successful. 1: DSID (None) 2: LNDARE 3: LNDELV 4: SBDARE 5: UWTROC (Point) I've found the QML format spec here <https://docs.qgis.org/3.16/en/docs/user_manual/appendices/qgis_file_formats.html>, but is there any guidance on starting from scratch? Thanks again for all the help. Eric On Wed, Mar 3, 2021 at 12:38 PM Martin Dobias <wonder...@gmail.com> wrote: > Hi Eric > > On Wed, Mar 3, 2021 at 5:48 PM Eric Younkin - NOAA Federal < > eric.g.youn...@noaa.gov> wrote: > >> Thanks for the quick reply. This is for NOAA nautical chart symbology, >> following the s57/s52 spec. You can see the symbology in the online viewer >> here <https://www.nauticalcharts.noaa.gov/ENCOnline/enconline.html>. It >> is basically a very complex spec that we generated for display in a >> wxPython widget a long time ago using GDAL 1.x commands. S57 is already an >> existing OGR driver, although I do not know what exactly that driver does. >> I do know that it does not somehow generate the symbology of the data for >> you to then render. >> >> The vector data would be a combination of area/line/point features, and I >> don't think it would be a fit for the Mesh layer. >> >> We'd like to make this symbology available in QGIS, so that users can >> drag in a s57 file and view the chart. You can use one of our WMS >> services, but having the file support would be useful. Ideally in a plugin >> layer, so that I can also use it in our other apps that use PYQGIS >> QgsMapCanvas >> widgets. >> > > Thanks for more background. In this case the mesh layer indeed is not > useful. I have not worked with S57 before, but if there is OGR driver > available, it should be relatively easy to load and style the data without > a plugin layer. You do not need to rely on styling provided by OGR (if > provided at all). It looks like you only need to load the data as a bunch > of vector layers using OGR (one for each object type) and then apply > styling to those individual layers. Styling of vector layers in QGIS is > fairly strong, with features like rule-based rendering, data-defined > properties and geometry generators you can handle even very complex styles. > After preparing individual styles for vector layers, you can save them to > .qml files, and then your plugin would have just a simple task of taking > the input file(s), load layers and apply saved styles. > > I would resort to writing a custom plugin layer only when when all other > options fail - it is more complex, and generally the user experience is not > great. > > Regards > Martin > > -- Eric Younkin Physical Scientist NOAA OCS, Hydrographic Systems and Technology Branch 1315 East-West Highway N/CS11, Room 6604 Silver Spring, MD 20910 Office: 240-847-8208 Cell: 828-331-8197
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