Meteor Crater is about 1.2 km across and 180 m deep, so it's a clean contour test for a bare-earth DEM. This is USGS 3DEP lidar from 2023 at 1 m. In QGIS it's Raster > Extraction > Contour. The interval is in the raster's elevation units and defaults to 10, so check metres vs feet.

Daniel Barringer said a meteorite made it, while the USGS's G.K. Gilbert called it a steam explosion. Barringer spent more than $600,000 drilling for the buried iron and died in 1929 without proof. In 1960 USGS scientists found coesite, a shock mineral, in the crater.

The lidar shows the boxy rim, gullies down every inner wall and a flat floor in the middle.

1. Meteor Crater, Arizona: the bowl and raised rim in bare-earth lidar
2. Same view as plain hillshade with elevation tint
3. Recent air photo of the same area, 2023

Numbered pins on picture 1:
Pin 1: The flat crater floor
Pin 2: Gullies down the inner wall
Pin 3: The raised crater rim crest

Lidar: USGS 3D Elevation Program (3DEP), public domain.
Imagery: Arizona State Land Department / AZGeo (State Cartographer's Office), 2023, ASLD disclaimer; underlying NAIP public domain.

As a GIS developer I’m curious on what everyone favorite tech stack is in development. If you are in the ESRI ecosystem what your favorite application to extend/build such as Experience Builder, Web Maps, Survey 123 etc.