[Qgis-user] Which android tablet

[Bernhard Ströbl]

Am 12.07.2012 11:48, schrieb watercress at gmx.de:
> Hi,
>
> has anyone tested the performance of qgis on android.
>
> I want to collect and store the position of 50 trouts tagged with radio
> transmitters directly in the field.
>
>
> What I did so far:
> I have to aim at the targets from different locations at the river bank.
> What I do now is simply draw lines on printed orthophotos. The fish is
> located where the lines intersect. It is always quite a mess to
> determine your own position. I could save the origin with a gps-device
> but this takes too much time, would include "postprocessing" and adding
> another step will increase the source of error.
>
> ... and it is not possible to walk into the stream ...
>
>
> I am thinking of using a tablet, locally store the orthophotos (5 to 8
> pieces, format: .jp2, each around 130 MB) and save the points (e.g.
> postgis). All metadata could be entered at once. No paper work. I know
> where I am and can easily store, edit,.. fish data in the field.
>
> But I am bit worried about the performance. I takes about two til four
> minutes to load those raster-layers at my desktop (Ubuntu 12.04, 16GB
> Ram, QuadCore,...). The performance appears very poor.

This is weird. I am not a specialist with raster formats but one of my 
aerial photos (geotif) 281 MB loads and displays within seconds, this is 
with pyramids (maybe you need to build these?)
I even put some 50 of these photos into a GDAL virtual raster (VRT), it 
takes some 20 seconds to load but displays almost immediately.
My machine is similar to yours hardwarewise (less RAM, though) running 
OpenSUSE 64 bit.

Bernhard

>
> What can I expect from a tablet solution? Anything missing in my chain
> of thoughts?
>
> I really appreciate any hints, ideas ,..I also would like to contribute
> my experience as a case study for the qgis-website.
>
> Regards,
> Jens
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>


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