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 <vladstelmahov...@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 <rich...@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 > > > > > > > > > > > > _______________________________________________ > > Interest mailing list > > Interest@qt-project.org > > http://lists.qt-project.org/mailman/listinfo/interest > > > > > > _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
