Contour lines and elevation metrics aren't available for some zoom levels. If you don't see the information you need, zoom in or out. How to get a 3D view in Google Maps The contour lines and ...

high-resolution national elevation data from the USGS 3D Elevation Program, and advanced computing to build a comprehensive landslide susceptibility model. The resulting map of the contiguous U.S., ...

The contour lines and elevation markings in Google Maps can be hard to understand. If you're trying to get a sense of how steep the incline of a trail is before hiking it, the 3D view can help.