2007 Bureau of Land Management (BLM) Lidar: Panther Creek Watershed, Yamhill County
The dataset represents LiDAR elevations acquired during a leaf-off and a leaf-on vegetative
condition for the Upper Panther Creek Watershed in the Yamhill County study area in
Oregon. The date of collection for the leaf off data is 20071208. The date of collection
for the leaf on data is 20070903. The area of interest covers ~5577 acres (~8.71 sq
miles). The LiDAR survey utilized a Leica ALS50 Phase II laser mounted in a Cessna
Caravan 208B set to acquire > or = 105,000 pulses per second (i.e. 105 kHz pulse rate).
The scan angle was +/- 14 degrees from nadir. These settings are 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. LiDAR intensity values were also
collected. 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 the Bureau
of Land Management.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
Oregon Department of Geology and Mineral Industries (DOGAMI)
- DOI/BLM > Bureau of Land Management, U.S. Department of the Interior
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| Not planned
||The report for The LiDAR Remote Sensing Data Collection: Yamhill County, Oregon may
be viewed at: ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/or/Yamhill_BLM_LiDAR_Report.pdf
||Provide high resolution terrain elevation and land cover elevation data.
|| Unknown to Unknown
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- Light Detection and Ranging
- Digital Terrain Model
- Bureau of Land Management
- Elevation data
- Bare earth
- Bare ground
- Leaf off
- Leaf on
- United States
- Pacific Northwest
- Yamhill County
- Panther Creek
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
- Watershed Sciences, Inc.
- DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
| Processing Steps
- Acquisition. The LiDAR data was collected on December 8, and September 3, 2007. A
Leica ALS50 Phase II LiDAR system was mounted in a fixed-wing aircraft. Near nadir
scan angles were used to increase penetration of vegetation to ground surfaces. Ground
level GPS and aircraft IMU were collected during the flight.
- Processing. 1. Flight lines and data were reviewed to ensure complete coverage of
the study area and positional accuracy of the laser points. 2. Laser point return
coordinates were computed using the ALS Post Processing software suite and IPAS Pro
software based on independent data from the LiDAR system, IMU, and aircraft. 3. The
raw LiDAR file was assembled into flight lines per return with each point having an
associated x, y, and z coordinate. 4. Visual inspection of swath to swath laser point
consistencies within the study area were used to perform manual refinements of system
alignment. 5. Custom algorithms were designed to evaluate points between adjacent
flight lines. Automated system alignment was computed based upon randomly selected
swath to swath accuracy measurements that consider elevation, slope, and intensities.
Specifically, refinement in the combination of system pitch, roll and yaw offset parameters
optimize internal consistency. 6. Noise (e.g., pits and birds) was filtered using
ALS postprocessing software, based on known elevation ranges and included the removal
of any cycle slips. 7. Using TerraScan and Microstation, ground classifications utilized
custom settings appropriate to the study area. 8. The corrected and filtered return
points were compared to the RTK ground survey points collected to verify the vertical
and horizontal accuracies. 9. Points were exported as laser points, TINed and GRIDed
- The NOAA Coastal Services Center (CSC) received the files in las format. The files
contained Lidar elevation and intensity measurements. The data was in UTM Projection,
Zone 10N and NAVD88 Geoid 03 vertical datum. CSC performed the following processing
to the data to make it available within the LDART Retrieval Tool (LDART): 1. The data
were converted from UTM coordinates to geographic coordinates. 2. The data were converted
from NAVD88 (orthometric) heights to GRS80 (ellipsoid) heights using Geoid 03. 3.
The LAS data were sorted by latitude and the headers were updated.
- 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 format. 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 of 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 to the ellipsoid (either GRS80 or ITRF94), allowing for
the ability to apply the most up to date geoid model when transforming to orthometric
Metadata Last Modified: 2013-06-07
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