Digital Terrain Model (DTM) shaded relief from 2005 LiDAR for the Green Lakes Valley, Colorado

This 1m Digital Terrain Model (DTM) shaded relief is derived from first-stop Light
Detection and Ranging (LiDAR) point cloud data from September 2005 for the Green
Lakes Valley, near Boulder Colorado. The DTM shaded relief was created from LiDAR point cloud
tiles subsampled to 1-meter postings, acquired by the National Center for Airborne
Laser Mapping (NCALM) project. This data was collected in collaboration between the
University of Colorado, Institute of Arctic and Alpine Research (INSTAAR) and NCALM,
which is funded by the National Science Foundation (NSF). The DTM shaded relief has
the functionality of a map layer for use in Geographic Information Systems (GIS) or
remote sensing software. Total area imaged is 35 km^2. The LiDAR point cloud data
was acquired with an Optech 1233 Airborne Laser Terrain Mapper (ALTM) and mounted in
a twin engine Piper Chieftain (N931SA) with Inertial Measurement Unit (IMU) at a
flying height of 600 m. Data from two GPS (Global Positioning System) ground
stations were used for aircraft trajectory determination. The continuous DTM surface
was created by mosaicing and then kriging 1 km2 LiDAR point cloud LAS-formated tiles
using Golden Software's Surfer 8 Kriging algorithm. Horizontal accuracy and vertical
accuracy is unknown. cm RMSE at 1 sigma. The layer is available in GEOTIF format
approx. 265 MB of data. It has a UTM zone 13 projection, with a NAD83 horizonal
datum and a NAVD88 vertical datum computed using NGS GEOID03 model, with
FGDC-compliant metadata. This shaded relief model was also generated. A similar layer, the Digital Surface Model (DSM),
is a first-stop elevation layer. A processing
report and readme file are included with this data release. The DTM dataset is
available through an unrestricted public license. The LiDAR DEMs will be of interest
to land managers, scientists, and others for study of topography, ecosystems, and
environmental change. NOTE: This EML metadata file does not contain important
geospatial data processing information. Before using any NWT LTER geospatial data
read the arcgis metadata XML file in either ISO or FGDC compliant format, using
ArcGIS software (ArcCatalog > description), or by viewing the .xml file provided
with the geospatial dataset.