2006 U.S. Geological Survey Topographic LiDAR: Alameda County
This kmz file shows the extent of coverage for the 2006 USGS Alameda County, CA lidar
The Light Detection and Ranging (LiDAR) data set is a survey of Alameda County in
Northern California. The entire survey covers approximately 868.382 square miles.
The Nominal Point Density of this dataset is approximately 1.66 meters for unobscured
areas. The LiDAR discrete-return point cloud data were originally available in the
American Society for Photogrammetry and Remote Sensing (ASPRS) LAS V1.2 format.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
||U.S. Geological Survey Earth Resources Observation and Science (EROS) Center
Documentation links not available.
- DOI/USGS > United States Geological Survey, U.S. Department of Interior
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||High-resolution digital elevation maps generated by airborne and stationary LiDAR
have led to significant advances in geomorphology, the branch of geoscience concerned
with the origin and evolution of Earth's surface topography. LiDAR provides unique
characteristics relative to other remotely sensed data sources by providing three-dimensional
feature information that cannot be derived from traditional imaging sensors.
||2006-06-25 to 2006-07-02
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- point cloud
- Alameda County
- San Francisco Bay
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
| Processing Steps
- The NOAA Coastal Services Center (CSC) received topographic files in LAS format. The
files contained lidar elevation and intensity measurements. The data were received
in projected California State Plane Zone 0403 coordinates and were vertically referenced
to NAVD88. The vertical units of the data were feet. CSC performed the following processing
for data storage and Digital Coast provisioning purposes: 1. High Noise (bad elevations)
were removed from tiles 29J and 30J. All elevations greater than 10 feet were removed.
2. Horizontally the data was converted from projected California State Place Zone
0403 coordinates (feet) to geographic NAD83 coordinates (decimal degrees) 3. Vertically
the data was converted from orthometric NAVD88 heights (feet) to ellipsoidal NAD83
(meters) using GEOID03 (assumed). 4. The data were converted to LAZ format.
- The NOAA National Geophysical Data Center (NGDC) received lidar data files via ftp
transfer from the NOAA Coastal Services Center. The data are currently
being served via NOAA CSC Digital Coast at http://www.csc.noaa.gov/digitalcoast/.
The data can be used to re-populate the system. The data are archived in LAS or LAZ
The LAS format is an industry standard for LiDAR data developed by the American Society
of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless compressed version
LAS developed by Martin Isenburg (http://www.laszip.org/). The data are exclusively
in geographic coordinates (either NAD83 or ITRF94). The data are referenced vertically
the ellipsoid (either GRS80 or ITRF94), allowing for the ability to apply the most
up to date geoid model when transforming to orthometric heights.
Metadata Last Modified: 2013-03-28
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