|2009 Oregon Parks and Recreation Department Lidar: Columbia River
||The data set represents the lidar elevations along the Columbia River corridor in
Oregon, including portions of the following counties: Gilliam, Hood River, Multnomah,
Sherman, Umatilla, Wasco. The area includes portions of the Columbia River Gorge,
as well as three smaller areas east of Hood River, OR. This data set covers 27,577
acres and was collected between December 7, 2009 and February 22, 2010. This data
is part of a larger LiDAR survey effort by the US Army Corps of Engineers along the
entire Columbia River. The lidar data are multiple return and are classified as unclassified
and bare earth. The LiDAR survey used Leica ALS50 Phase II and ALS60 laser systems.
The sensor scan angle was +/- 14 degrees from nadir with a pulse rate designed to
yield an average native density (number of pulses emitted by the laser system) of
> or = 8 points per square meter over terrestrial surfaces. In some areas of heavy
vegetation or forest cover, there may be relatively few ground points in the LiDAR
data. Elevation values for open water surfaces are not valid elevation values because
few LiDAR points are returned from water surfaces. Watershed Sciences, Inc. collected
the LiDAR and created this data set for Oregon Parks and Recreation Department.