[Qgis-user] QField: recommendations for aerial basemap preparation?

[Wouter Impens]

Hi Bernd,

It's possible to load a WMS layer in your project for Q-field, maybe that's
a solution?
But then of course you need an internet connection all the time...

Greetings
Wouter

Op zo 24 mrt. 2019 om 21:37 schreef Bernd Vogelgesang <
bernd.vogelgesang at gmx.de>:

> Hi,
>
> I need an aerial basemap for my QField-project to be able to locate
> positions. As QField has not the ability to navigate to a point or
> indicate the direction of movement, provided only with a topographic
> basemap, I'm stumbling through the forest and have a hard time finding
> the positions.
>
> The project area is huge, around 400 square kilometers! I have a Mrsid
> file of the area of 1.6 GB with 20 centimeter resolution,
> transformed with gdal_translate to tiff is 42.5 GB,
> compressed with gdal_transform with jped-compression 50% 968 MB,
> resampled to 40cm resolution and 50% jpeg has 295 MB
>
> I used the QField sync plugin to generate a baselayer in gpgk-format
> from this ,which has 540 MB with 40 cm resolution.
>
> Unfortunately, on the tablet, the baselayer is loading so slow, that it
> is impossible to work with it. Each redraw takes around 10 seconds in
> the small scale, rising to infinity in higher scales.
>
> I wonder if there are other approaches recommendable, for example
> splitting the image into separate layers for bigger regions, which I
> could then turn on and off, or if I should prepare the image apart from
> using the plugins converter to gpkg.
>
> Due to the enourmous amount of time needed to process the image on the
> PC, a trial-and-error approach seems not to be feasable, so I ask you if
> someone can recommend an approach for such a huge beast.
>
>
> Thanx in advance,
>
> Bernd
>
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