[Qgis-developer] working with temporal data

[Volker Fröhlich]

Home range analysis is one of the applications I personally have in mind, 
developing such a plugin with Anita.

Having dynamic overlays of kernels could be nice, for instance. I'll add my 
thoughts to the Wiki later.

Volker

Am Mittwoch 04 August 2010, 16:07:43 schrieb Václav Řehák:
> 2010/8/3 Martin Dobias <wonder.sk at gmail.com>:
> > Hi Anita
> > 
> > On Sun, Aug 1, 2010 at 12:48 PM, Anita Graser <anitagraser at gmx.at> wrote:
> >> Hi,
> >> 
> >> Few days ago, I stumbled upon this new ESRI tool to work with temporal
> >> data:
> >> http://blogs.esri.com/Dev/blogs/arcgis/archive/2010/04/16/New-experienc
> >> e-and-tools-for-working-with-temporal-data.aspx
> >> 
> >> Such a tool would be really useful for my work any many others too I
> >> believe. So, I've been thinking about writing a python plugin that
> >> basically adjusts the layers subsetString to the chosen time frame. But
> >> before I start coding, I'd like to ask your opinion on what would be
> >> the best way to implement such a functionality and maybe somebody
> >> already implemented it or something similar.
> >> 
> >> On a related topic: I'd also be interested in a "Save as Animation"
> >> functionality similar to "Save as Image". Do you think it's reasonable
> >> to implement such a functionality in Python? Do you know any libraries
> >> worth considering for this job?
> > 
> > An interesting idea for a plugin! The proposed approach with
> > subsetString should work. When it comes to handling of animations, you
> > could try to use mencoder (a companion of mplayer) for converting a
> > series of images to video [1]. I have also some experience with ffmpeg
> > library for encoding video - it has C api, but it looks there are some
> > python libraries that wrap it (pyffmpeg, pymedia).
> > 
> > [1] http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-enc-images.html
> 
> I also find this functionality very appealing for a plugin - it would
> help a lot for a home range study we do using QGIS. Talking about
> temporal data, is there any reason why there is no support for
> datetime attributes in QGIS, only numbers and strings? In our study we
> need to create point features for locations where an animal was
> observed and the filter those features based on date and time.
> 
> Vaclav
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