In the past I was working on different plugins to connect with multiple APIs and use their isochrone endpoints in QGIS. Let me summarize some of my findings and share my opinion on HERE, Azure Maps, Bing Maps, ORS, Esri and Iso4App.
If you digitize features for OpenStreetMap you might have used Landsat data or the Bing basemap. Now we do have one other source for our armchair mapping approach: Esri World Imagery basemap. In the past you were able to view the data. Using the basemap data for digitization was not allowed.
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