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2011 Puget Sound LiDAR Consortium (PSLC) Topographic LiDAR: Kittitas-Colockum Study Area

browse graphicThis kmz file shows the extent of coverage for the 2011 PSLC Kittitas-Colockum Study Area, WA lidar data set.
Watershed Sciences, Inc. (WSI) collected Light Detection and Ranging (LiDAR) data on 6 days between September 15th and November 5th, 2010 for the Puget Sound LiDAR Consortium in Kittitas County, WA. The requested. As the dataset is adjacent to a previously delivered LiDAR dataset (Wenatchee), comparisons were made to ensure spatial accuracy between datasets. The total acreage of this delivery is 172,115 acres of LiDAR data. Point density 8.5 points/m2.

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    Distribution Formats
    • LAZ
    Distributor Distributor information not available
    Point of Contact Diana Martinez
    Puget Sound Lidar Consortium (PSLC)
    Associated Resources
    • Lidar Dataset Supplemental Information
    • Diana Martinez
      Puget Sound Lidar Consortium (PSLC)
      • publication: 2013-12-03
      Data Presentation Form: Digital image
      Dataset Progress Status Complete
      Data Update Frequency: As needed
      Purpose: Provide high resolution terrain elevation and land cover elevation data.
      Time Period: 2009-05-02T1200  to  2009-05-27T1200
      Spatial Reference System:
      Spatial Bounding Box Coordinates:
      N: 47.23914574
      S: 46.98246108
      E: -119.9356002
      W: -120.4130622
      Spatial Coverage Map:
      • Topography
      • Elevation
      • Model
      • LiDAR
      • LAZ
      • LAS
      • Remote Sensing
      • US
      • Washington
      • Douglas County
      Use Constraints No constraint information available
      Fees Fee information not available.
      Lineage Statement Lineage statement not available.
      Processing Steps
      • Acquisition. The LiDAR survey utilized Leica ALS50 Phase II and ALS 60 sensors in a Cessna Caravan 208B (dual-mounted 9/15/10). The sensors operate with Automatic Gain Control (AGC) for intensity correction. Depending on acquisition day weather and terrain, the Leica systems were set to acquire from =83,000 to 105,900 laser pulses per second (i.e., 83 ? 105.9 kHz pulse rate) and flown at 900-1300 meters above ground level (AGL), capturing a scan angle of +/- 14 degrees from nadir. These settings were developed to yield points with an avg native pulse density of more than 8 pulses per sq m over terrestrial surfaces. It is not uncommon for some types of surfaces (e.g. dense vegetation or water) to return fewer pulses than the laser originally emitted. These discrepancies between ?native? and ?delivered? density will vary depending on terrain, land cover, and the prevalence of water bodies.
      • Resolved kinematic corrections for aircraft position data using kinematic aircraft GPS and static ground GPS data. Software - Waypoint GPS v.8.10, Trimble Geomatics Office v.1.62 2. Developed a smoothed best estimate of trajectory (SBET) file that blends postprocessed aircraft position with attitude data. Sensor head position and attitude were calculated throughout the survey. The SBET data were used extensively for laser point processing. Software - IPAS v.1.35 3. Calculated laser point position by associating SBET position to each laser point return time, scan angle, intensity, etc. Created raw laser point cloud data for the entire survey in *.las (ASPRS v. 1.2) format. Software - ALS Post Processing Software v.2.70 4. Imported raw laser points into manageable blocks (less than 500 MB) to perform manual relative accuracy calibration and filter for pits/birds. Ground points were then classified for individual flight lines (to be used for relative accuracy testing and calibration). Software - TerraScan v.10.009 5. Using ground classified points per each flight line, the relative accuracy was tested. Automated line-to-line calibrations were then performed for system attitude parameters (pitch, roll, heading), mirror flex (scale) and GPS/IMU drift. Calibrations were performed on ground classified points from paired flight lines. Every flight line was used for relative accuracy calibration. Software - TerraMatch v.10.006 6. Position and attitude data were imported. Resulting data were classified as ground and non-ground points. Statistical absolute accuracy was assessed via direct comparisons of ground classified points to ground RTK survey data. Data were then converted to orthometric elevations (NAVD88) by applying a Geoid03 correction. Software - TerraScan v.10.009, TerraModeler v.10.004 7. Bare Earth models were created as a triangulated surface and exported as ArcInfo ASCII grids at a 3?foot pixel resolution. Highest Hit models were created for any class at 3-foot grid spacing and exported as ArcInfo ASCII grids. Software - TerraScan v.10.009, ArcMap v. 9.3.1, TerraModeler v.10.004
      • The NOAA Coastal Services Center (CSC) downloaded topographic files in LAZ format from PSLC's website. The files contained lidar easting, northing, elevation, intensity, return number, class, scan angle and GPS time measurements; the data was received in state plane Washington South (in feet) and vertical coordinates were referenced to NAVD88 in feet using the Geoid03 model. CSC performed the following processing for data storage and Digital Coast provisioning purposes: 1. The All-Return LAZ files were checked for bad elevations 2. The laz files were converted from a Projected Coordinate System (SP 4602) to a Geographic Coordinate system (NAD83) 3. The laz files were then converted to ellipsoidal vertical units in meters using the geoid03 conversion.
      • 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 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 ( 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 heights.

      Metadata Last Modified: 2013-12-06

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