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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