[QGIS-Developer] GDAL drivers and availability in QGIS

[Nyall Dawson]

On Sat, 23 Feb 2019 at 08:00, Richard Duivenvoorde <rdmailings at duif.net> wrote:
>
> Hi Devs,Users,
>
> Users report that in the 'Open Vector' dialog some items were shown
> twice (geojson[0] and esri shape[1]).
>
> I had a look into it for the geojson [2] and the issue is that we show
> the dropdown with 'formats' based on the Drivers that GDAL is giving us.
> In the case of geojson there is also geosjonseq: a way to 'stream'
> features as json, and then in a couple of subvariants.
> I added those in the dropdowns for 'files' and 'protocols'. But voices
> say that this is actually cluttering the user interface.
>
> So before trying to fix the esri one too (which is double because there
> is also a ESRIjson) I was wondering what others think of adding all
> these possibilities.
>
> As an example: we could add a 'ESRI json' item in the file-open
> dropdown, with filter esrijson and json? But should we also add an
> esrijson protocol option?
> GDAL/OGR will actually pick the right driver anyway: opening [3] as
> geojson will happily show the esrijson as features...
>
> Personally I'm ok with adding all the options, as I think they also show
> the possible flavours or file extensions possible.

I think we should be pushing users to use the native FeatureServer
provider here, as it has several advantages:
- downloads features "on demand", instead of upfront. (And many times
it will download these responsively in a background thread during the
rendering process)
- automatically styles layers with the same styling and labeling as is
set on the server
- full support for QGIS networking, including authentication system
- support for accessing data with custom referral checks and via
"borrowed" ESRI authentication tokens

(and hopefully in 3.8, editing support!)

Nyall

>
> What do you think?
>
> Regards,
>
> Richard Duivenvoorde
>
> [0] https://issues.qgis.org/issues/21160
> [1] https://issues.qgis.org/issues/20127
> [2] https://github.com/qgis/QGIS/pull/9138
> [3]
> https://services.arcgis.com/rOo16HdIMeOBI4Mb/arcgis/rest/services/Heritage_Trees_Portland/FeatureServer/0/query?f=json&objectIds=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100&inSR=3857&outSR=3857&returnGeometry=true&outFields=FID,GEODB_OID,OBJECTID,TREEID,STATUS,SCIENTIFIC,COMMON_NAM,STATEID,ADDRESS,HEIGHT,SPREAD,CIRCUMFERE,DIAMETER,YEAR,OWNER,NOTES&returnM=false&returnZ=false
>
>
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