It would be nice if we can choose an ArcGIS webmap to use as the basemap of the GeometryPicker. This would be very nice to use with the Web App.
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Geometry Picker basemap using Arcgis Webmap
+69- Evangelist
I recently added a related idea to enhance the basemap and/or leaflet layers that help give Flow apps with Define Geometry layers that help users draw their Area of Interest geometry Geometry Picker Support for ArcGIS Esri content basemaps + feature services in FME Flow Apps – background maps | Community