[Interest] Qt Location GeoServices plugin to use geo-referenced image file as map source

[Paolo Angelelli]

Indeed! As answered in the bug report, the easy workaround is to cut your tif into tiles
(like using QGis w QTiler plugin or gdal2tiles, or whatever other mean), and then you
don't even need to serve the tiles via http, you can fetch them locally either from file
(file:///) or qrc, depending on how it's best for you to ship them.

On Thu, 7 Dec 2017 13:24:20 +0100
Vlad Stelmahovsky <vladstelmahovsky at gmail.com> wrote:

> Hi
> 
> take a look at OSM plugin. it contains custom providers and caching
> mechanism
> 
> On Thu, Dec 7, 2017 at 3:19 AM, Richard Lang <richard at satco.co.nz> wrote:
> 
> > Repost of question asked on Qt Forums and raised as a feature request on
> > the bug tracker...
> >
> > https://forum.qt.io/topic/85704/qt-location-geoservices-
> > plugin-to-use-geo-referenced-image-file-as-map-source
> >
> > https://bugreports.qt.io/browse/QTBUG-65018?jql=project%20%3D%20QTBUG
> >
> > ============================================================
> >
> >
> > I'm currently working on a Qt Quick application that will provide a map
> > viewer for a smallish area (1 square KM or so), the map details for which
> > will be provided in a single geo-referenced image file (GeoTIFF,
> > geo-referenced PDF, ESRI Shape file etc.), along with display of current
> > location, operator identified points of interest etc. It's primarily
> > responsibility is the display of custom maps (as opposed to generic maps
> > retrieved from public map image service providers (OSM, MabBox, ESRI etc)),
> > and it will often be used in areas with limited connectivity
> >
> > An extensive web search has identified others who have made similar
> > enquiries in the past (in these forums, Stack Overflow etc), and the
> > general suggestions for solutions are as follows:
> >
> >    - ArcGIS Runtime with Qt SDK *Doesn't work for me as down the track
> >    I'm intending to target an embedded linux device using an ARM processor,
> >    and ArcGIS doesn't make source available for cross-compilation for
> >    arbitrary targets. They've recently produced an Android release, but
> >    nothing for ARM linux in general)*
> >    - QGIS developer libraries *GPL licence not compatible with my
> >    commercial development*
> >    - Use the Qt Location *Map* component with a local tile server or
> >    offline tile collection,alongside a local tiling engine to create the
> >    necessary tile set from the input image file.  *Seems a bit of a hack,
> >    as noted I'm primarily using custom maps, as opposed to offline copies of
> >    public map server images, and my images won't be big enough to otherwise
> >    warrant tiling anyway*
> >
> > It would be feasible to develop a Qt Quick component from scratch to do
> > this, but given that the existing Qt Location *Map* component provides a
> > well defined pre-existing front end interface for everything my map would
> > need to do and has an extendable plugin based architecture, writing a
> > custom Qt Location GeoServices plugin seems the most sensible and elegant
> > way forward.
> >
> > I've started examining the source code of the existing plugins, but can't
> > shake the feeling that in a world containing 8 billion people, with
> > "nothing new under the sun", this would have been done already if it was a
> > good idea....
> >
> > Would anyone with more familiarity with the Qt Location module care to
> > comment?
> >
> >
> > thanks
> >
> > Richard
> >
> >
> >
> >
> >
> > _______________________________________________
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> > Interest at qt-project.org
> > http://lists.qt-project.org/mailman/listinfo/interest
> >
> >  
> 
>