[Qgis-user] S57 map files

[Florian El Ahdab]

Thank you to both of you for your very valuable inputs.

I've browsed the ogrprovider code and found how to implement your proposal.
Although I still haven't modified anything, I've made a few tries that seem
encouraging.

Martin: I am hoping to reach an acceptable solution for opening S57 layers
on demand soon. I will also have to set up svn to produce the actual patch
appropriately.

Chris: The S52 implementation will obviously be the next step. Thank you for
all this information (I had no idea the S52 was actually already coded
somewhere... That's good news!)

See you soon.
Florian

On Sun, Jan 18, 2009 at 8:14 PM, Martin Dobias <wonder.sk at gmail.com> wrote:

> On Sun, Jan 18, 2009 at 6:52 PM, Chris h <chris123 at magma.ca> wrote:
> > On Sunday 18 January 2009 11:04:13 Florian El Ahdab wrote:
> >> - I believe Qgis doesn't use the S57 sublayers and that's why nothing
> gets
> >> displayed. Is there any chance that I am right? If I am right,
> >
> > Your most likely correct.
>
> Yes, QGIS always opens first sublayers and doesn't care about the rest.
>
>
> >> I would like
> >> to help with the implementation for this kind of problem. Can anyone in
> the
> >> dev team give me directions on where to begin (I have spent some time in
> >> the source and API of both Qgis and GDAL and feel I can contribute
> here...)
> >
> > Perhaps a good start would be reviewing the submitted material above and
> then
> > following the directions and advice of the qgis development team.
>
> First of all, a small change in OGR provider in QGIS will be needed to
> allow sublayers. This provider awaits a file as input string - let's
> add an optional parameter that would specify the layer inside the
> file, e.g.:
> /data/gis/s-57/ca49995b.000&layer=4
> (note the added "&layer=4")
>
> Then in GUI: when an input file for OGR provider is selected, check
> whether there's more than one sublayer - if so, open a dialog and let
> user select which sublayers he would like to see. Create input strings
> for OGR provider from the chosen sublayers and load them.
>
> Patches are always welcome :-)
>
> Martin
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