https://developers.arcgis.com/documentation/mapping-apis-and-services/reference/zoom-levels-and-scale/
How to convert
https://desktop.arcgis.com/en/arcmap/latest/map/publish-map-services/designing-a-map-to-overlay-arcgis-online-google-maps-and-bing-maps.htm
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Large scale cover small area
https://transparentgov.net/earth/gps/googlemaps2/nav.html
Small scale cover large area