2007 California Department of Water Resources Topographic LiDAR: San Joaquin Delta
This kmz file shows the extent of coverage for the 2007 CWDR San Joaquin Delta lidar
These data are from LIDAR flights of the Sacramento-San Joaquin Delta conducted during
late January and February of 2007. The work was conducted under contract issued by
California Department of Water Resources to URS Corporation. The prime LIDAR creation
subcontractor was EarthData International, (later Fugro EarthData), also known as
EDI. The principal aerial survey firm under subcontract to EDI was Airborne 1 Corporation.
In effect, Airborne 1 performed the aerial survey, and EDI did the processing and
deliverables preparation. Also involved in the contract to URS was an independent
QA/QC firm, Spectrum Mapping LLC. The data was delivered to CSC as unclassified, multiple
return elevation measurements and intensity in LAS V1.0 format. The NOAA CSC used
an unsupervised classification algorithm to classify the data into the following ASPRS
classifications: Class 1 (Unclassified), Class 2 (Ground), and Class 7 (Noise) . Class
2 includes bare earth points and water points.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
||California Department of Water Resources
Documentation links not available.
- California Department of Water Resources (CDWR)
|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.
||2007-01-01 to 2007-02-01
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- point cloud
- Yolo County
- Sacramento County
- Solano County
- San Joaquin County
- Contra Costa County
- Alameda County
- San Joaquin River Delta
| 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 UTM Zone 10N, NAD83 coordinates and were vertically referenced to NAVD88.
The vertical units of the data were meters. CSC performed the following processing
for data storage and Digital Coast provisioning purposes: 1. The unclassified LAS
files were classified by NOAA CSC using MARS7 software. The data contains Class 1
(Unclassified), Class 2 (Ground), and Class 7 (Noise). 2. The LAS files were retiled
into 1500x1500 meters tiles using MARS7 software. 3. The LAS files' Class 2 (Ground)
points were rechecked for High/Low Noise. If points were found they were removed from
the data. 4. Horizontally the data was converted from projected UTM Zone 10N coordinates
(meters) to geographic NAD83 coordinates (decimal degrees). 5. Vertically the data
was converted from orthometric NAVD88 heights (meters) to ellipsoidal NAD83 (meters)
using GEOID03 (Geoid model assumed). 6. 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: 2013-10-17
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