Is there a way to implement this on the ArcGIS Online map viewer using the default basemaps?
For the data on my map I need to be able to view it at about half way between two zoom levels, the steps between the levels are too large. I noticed in Google Maps zooming using the mouse wheel increments the zoom level by 0.25, this feels about right.
Doing this in ArcGIS Desktop is simple with the Continious Zoom tool.
The only way I've found of doing this on ArcGIS Online is by using a MapService as a basemap.
Why do ArcGIS Online maps require a basemap at all? What if I don't want one?
Is there an empty/blank MapService I can use to work around this?