Qml load Offline Map (mapbox, osm and etc)

nsourl

Hi,

I am working on a project where it's necessary to use a Map. But the internet connection will not be always sufficient and stable enough to render the map in live mode.

So, we need to load the map offline and I was looking a way how to do that in Qml. But unfortunately it's not clear to me what are the steps that I have to follow to load the Map offline in Qml and if it's supported from available Qt Location Plugins (mapbox, mapboxgl, osm, esri and etc).

Also, does anyone know if it's possible to load offline in Qml a custom or paid map?

Thanks.

jeremy_k

For OSM: https://www.qt.io/blog/2017/05/24/qtlocation-using-offline-map-tiles-openstreetmap-plugin

If the goal is an offline mode that ignores network accessibility, it's a little more complicated. https://bugreports.qt.io/browse/QTBUG-77207

nsourl

@jeremy_k thank you for sharing all these useful information.

Do you know is there any way to do the same with mapboxgl plugin instead of osm ?

Thanks.

jeremy_k

I don't know if any of the other plugins offer this functionality.

nsourl

@jeremy_k

Finally, I was able to load offline map using the osm plugin and following the guidelines from blog post.

You can make it with Mapbox plugin too by using commercial Mapbox Atlas product to self-host a Docker container and feed your Qt application with offline map data. But the Atlas price is quite high for projects that are not recommended for enterprise and large scale applications.

Thank you for your help!

dearqt

@nsourl How did you load offline map with using osm plugin. I have offline tiles and I am using osm plugin but when there is no network connection it does not display the map. Here is my qml:
import QtQuick 2.7
import QtQuick.Window 2.2
import QtLocation 5.8

Window {
id: win
objectName: "window"
visible: true
width: 512
height: 512

Map {
    id: map
    anchors.fill: parent
    activeMapType: map.supportedMapTypes[1]
    zoomLevel: 1
    plugin: Plugin {
        name: 'osm';
        PluginParameter {
            name: 'osm.mapping.offline.directory'
            value: ':/offline_tiles/'
        }
    }
}

}

Exactly the same with https://www.qt.io/blog/2017/05/24/qtlocation-using-offline-map-tiles-openstreetmap-plugin this article bur it does not work when there is no internet.

HemaSaraswathi

osm_100-<l|h>-<map_id>-<z>-<x>-<y>.<extension>
While naming your tiles make sure the map id value is same as the active map type.
Here you have given 1 as active map type so make sure map_id is 1.