I am creating a GIS application for our site analysts using ArcGIS Online (tho I do have ArcDesktop as well), and a need is to view 10-foot contour lines for any area in the U.S. For example, if we have a prospective customer at some location, the analysts need to view the 10-ft contours of the terrain of their parcel(s).
I've looked and unable to find a scheme to implement this in either ArcGIS Online or Pro. I've seen doing so from a DEM raster, but just for some pre-defined area. Thanks!