[Qgis-developer] Temporal data (was QGIS GRASS Plugin Upgrade Crowdfunding)

[Saber Razmjooei]

Hi all,

If the long term aspiration of having support for temporal data is to
support NetCDF, HDF, GRIB, etc similar to:
http://blogs.esri.com/esri/apl/2015/03/11/dimension-explorer/
then probably we need to have more to it.

Martin has done a major update of the crayfish plugin which now supports
xdmf (a variation of HDF5) and soon we are looking to add animation feature
and more file support:
https://github.com/lutraconsulting/qgis-crayfish-plugin


Cheers,
Saber


-----Original Message-----
From: qgis-developer-bounces at lists.osgeo.org
[mailto:qgis-developer-bounces at lists.osgeo.org] On Behalf Of Matthias Kuhn
Sent: 30 March 2015 10:31
To: Nyall Dawson
Cc: qgis-developer; grass-dev at lists.osgeo.org
Subject: Re: [Qgis-developer] Temporal data (was QGIS GRASS Plugin Upgrade
Crowdfunding)

Hi

I think the very first step in this should be to add proper date (time)
support.
I don't know the state and requirements for raster layers, but for vector
layers I think right now time is converted with the edit types just for
visualization but internally it is passed around as string. It would be nice
to handle them as QDate(Time) internally.

For time-aware databases (postgres...) this should be straightforward.
For others (like shapefile?) we probably need to manage the datatype on the
project level but conversion should IMHO happen low-level directly in the
provider code so things like timezone handling and whatever else needs to be
done can happen exactly once when the data is read from the datasource or
saved to the datasource.

Filtering (from date ... to date ) should best be done on the
QgsFeatureRequest level (setFilterExpression should already be ready I
guess)

Best,
Matthias
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