Topic Author's Original Post - Oct 8, 2012 - 01:23pm PT
Figured this deserved its own thread.
Below is a digital terrain movie of El Capitan I put together for my Facelift presentation. It was produced from terrestrial laser scanning (LiDAR) data collected from El Cap Meadow, with many millions of individually georeferenced points. The grayscale values relate to the reflectivity of the rock, which is why the North America diorite appears so dark relative to the surrounding granite.
We are using terrestrial LiDAR to map the geology of El Capitan and study rockfalls throughout Yosemite Valley. Enjoy!
Yosemite Park Geologist
The data were collected with an Optech long-range scanner. We tried several "extended range" units beginning in 2007, but none had the range to get data from the upper third of the cliff until the long-range unit was introduced in 2010. I use I-Site Studio software to view the point clouds.