Information and discussion related to high-resolution lidar topography for the Earth sciences
The final piece of the Lake Tahoe Lidar dataset - standard digital elevation model (DEM) and intensity rasters - are now available for download from the OpenTopography standard DEM page. These products, produced by Watershed Sciences, the vendor who performed the Tahoe data collection, consist of three separate data layers all at 0.5 meter resolution in the ERDAS Imagine (.IMG) format:
As we announced last week, lidar data for the whole Lake Tahoe basin are now available via OpenTopography. Over the past week this dataset has seen a quite a bit of traffic, with over 160 jobs run (10+ billion points processed) by more than 50 unique users.
A relatively common question from OpenTopography users is how they can filter or classify a lidar dataset that was delivered by the data provider without ground (bare earth) returns differentiated from vegetation returns. The B4 lidar dataset, which covers the southern San Andreas and San Jacinto faults is a good example of a dataset where the lack of classification can be problematic for users, especially those working at higher elevations where vegetation can be dense.
This well done ~10 minute video from Oregon Public Broadcasting's Field Guide does an excellent job of highlighting the various earth science applications for the lidar data being collected by the Oregon Department of Geology and Mineral Industries' (DOGAMI)
The USGS has released a beautiful poster of Mount St. Helens created from high-resolution LiDAR topography data. The poster is USGS General Information Product 116 and is freely available for download in PDF format at either 17x22 inches or 32x42 inches.