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View a path’s elevation profile
Explore the slope, elevation, and distance along a path.
1.Open Google Earth.
2.Draw a path or open an existing path.
3.Click Edit and then Show Elevation Profile.
4.An elevation profile will appear in the the lower half of the 3D Viewer. If your elevation measurement reads "0," make sure the terrain layer is turned on. •The Y-axis of the chart displays the elevation, and the X-axis of the chart displays the distance.
•To see the elevation and distance at different points along a path, mouse over the path.
•To see data for a portion of the path, left-click and hold. Then, move the cursor along the path you want to see.
•To change measurement systems on a Windows computer, select Tools and then Options. Then, under "Units of measurement," choose feet or meters.
•To change measurement systems on a Mac, select Google Earth and then Preferences. Then, under "Units of measurement," choose feet or meters.
https://support.google.com/earth/answer/148134?hl=en