The GeoChristian

The Earth. Christianity. They go together.

LIDAR image of Mima mounds

Mima mounds are small hills (about 2 m tall, about 10 m across) of unknown origin that occur in groups of hundreds or thousands in Washington State and other places. The most famous group of these mounds are at Mima Prairie near Olympia, Washington. I haven’t been at this site, but I have been at a smaller group of Mima mounds in the Channeled Scablands of Eastern Washington.

The Washington Department of Natural Resources has released incredibly detailed topographic models of Mima Prairie:

Credit: Washington DNR via The Seattle Times

Credit: Washington DNR via The Seattle Times

This image was created using LIDAR, which is sort of like RADAR, except it uses laser light rather than radio waves. LIDAR can see through vegetation (if you want it to; it depends on how you set it up and process the data) and can produce an image with accuracies of less than ten centimeters.

The origin of Mima mounds is uncertain. Common explanations include glacial or periglacial (i.e. near-glacier) processes, gophers, earthquakes, and Indian burial mounds.

HT: The Seattle Times (via my sister)

Wikipedia: Mima mounds

Grace and Peace

P.S. The U.S. Forest Service has a good overview of the use of LIDAR for natural resource investigations. The following image shows not only the ground surface, but the forest canopy:

Credit: USFS/RSAC

Credit: USFS/RSAC

April 3, 2009 - Posted by | Geology, Imagery, Maps

No comments yet.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: