revert-pr-1011

[jwasilgeo]

reverting changes introduced in pr #1011

resolves #1210

see enhancement issue #1222 for revisiting bringing this back in down the road

[gavinr]

The code changes look great, but ....

I noticed that after these changes, if you zoom into the Atlantic ocean, you get gray "map data not yet available" errors starting at zoom level 14: http://somup.com/cYiuD262nw .. I thought we were expecting that if we reverted this and set the maxZoom to 19, then we would at least have tiles everywhere on the world.

[jgravois]

if you zoom into the Atlantic ocean, you get gray "map data not yet available" errors starting at zoom level 14

that is true of the Topographic basemap and others as well. They don't cook tiles to level 19 in the middle of the ocean.

https://esri.github.io/esri-leaflet/examples/switching-basemaps.html

[gavinr]

Huh, I never noticed that. Given that it's now consistent with the other basemaps, sounds good to me to merge this.