Is there a numerical terrain elevation tool (overlay) to aid in construction?

[Nellie Knoller]

Years ago I seem to remember a way to get the numerical value for the terrain elevation for a patch of land. It was like an overlay with numbers - sometimes lots of numbers - depending how rough the patch of land is.  Is was used as a temporary building aid.

[Lindal Kidd]

You can apply a .RAW elevation data file to a region to do a one-click overall terrain mod.  The Knowledgebase excerpt below may help:

Backing up and restoring Private Region terrain

If you own a Private Region, you can back up your region's terraformed terrain to a texture file on your computer and use that file to restore your region's terrain to its saved shape. This is a great safety net in case you experience a terraforming accident, and it is also useful if you want to apply the same terrain to multiple regions you own.

To access the terrain backup and restore controls, choose World > Region/Estate in the Second Life Viewer®, and click the Terrain tab. Then:

To backup your terrain:

1. Click Download RAW terrain.
2. A file browser dialog appears. Choose a location to save to and give your terrain file a specific name so it's easier to find.
3. Click Save.
4. Next, you see: "Terrain file written, starting download." The download process may take several minutes. Do not leave the region, and don't make any other terraforming changes until the download completes!
5. When the download completes, you see: "Finished download of raw terrain file to:" and the directory it was saved to.
6. Click Close.

To restore your terrain:

1. Click Upload RAW terrain.
2. Select a .raw terrain file on your hard drive that you or someone else saved earlier.
3. Click Open (or Choose on Mac).
4. You see: "Upload started." It may take up to two minutes, depending on your connection speed.
5. When the upload is complete, you see: "Terrain upload done." The terrain changes to the contents of the .raw file.