teanaway_be

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Quantum Spatial

Publication_Date: 20151120

Title: teanaway_be

Geospatial_Data_Presentation_Form: raster digital data

Description:

Abstract:

The combined topobathymetric digital elevation model (DEM) represents the earth's surface with all human-made structures and vegetation removed. The topobathymetric DEM is derived from integrated NIR and Bathymetric LiDAR data using TIN processing of the ground/bathymetric point returns. This version of topobathy DEMs has been clipped to avoid triangulation over areas identified as voids in the Bathymetric Confidence Polygon (provided as a separate deliverable). The horizontal datum for this dataset is NAD83 (HARN), the vertical datum is NAVD88, Geoid03, and the data is projected in Washington State Plane South. Units are in US Survey Feet. Quantum Spatial collected the Teanaway Streams Topobathymetric LiDAR data for Puget Sound LiDAR Consortium between 04/30/15 and 05/02/15.

Purpose:

Provide high resolution terrain and bathymetric elevation data from the Teanaway Streams Topobathymetric LiDAR dataset.

Supplemental_Information:

This data is assembled by 1/4 USGS Quads and projected in Washington State Plane South.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20150430

Ending_Date: 20150502

Currentness_Reference: Teanaway Streams Topobathymetric LiDAR

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -121.306077

East_Bounding_Coordinate: -120.655370

North_Bounding_Coordinate: 47.365168

South_Bounding_Coordinate: 47.162931

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword:

Light Detection and Ranging, Bathymetric LiDAR, NIR LiDAR, topography, bathymetry, topobathy, elevation data, bare earth, DEM, digital elevation model

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Categories

Theme_Keyword: elevation

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Washington

Access_Constraints: None

Use_Constraints:

In some areas of heavy vegetation or forest cover, there may be relatively few ground points in the LiDAR data. TINing the points produces large triangles and hence the elevations may be less accurate within such areas. Additionally, the Riegl VQ820G has a stated depth penetration of 1.5 secchi depths and therefore bathymetric data deeper than 1.5 secchi depths at the time of acquisition is not to be expected. Users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Puget Sound LiDAR Consortium

Contact_Person: Christy Lam

Contact_Address:

Address_Type: unknown

Address: 1011 Western Ave., Suite 500

City: Seattle

State_or_Province: Washington

Postal_Code: 98104

Country: US

Contact_Voice_Telephone: 206-971-3283

Data_Set_Credit: Puget Sound LiDAR Consortium

Native_Data_Set_Environment:

Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.1.4959

Data_Quality_Information:

Logical_Consistency_Report:

Shaded relief images have been visually inspected for data errors such as pits, border artifacts, and shifting. LiDAR flight lines have been examined to ensure consistent elevation values across overlapping flight lines. The Root Mean Square Error (RMSE) of line to line relative accuracy for this dataset is 0.175 ft (0.053 m). Please see the LiDAR data report for a discussion of the statistics related to this dataset.

Completeness_Report:

LiDAR data has been collected and processed for all areas within the project study area.

Positional_Accuracy:

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

The Fundamental Vertical Accuracy (FVA) of this dataset, tested at 95% confidence level is 0.269 ft (0.082 m). Please see the LiDAR data report for a discussion of the statistics related to this dataset.

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: 0.269 ft (0.082 m)

Vertical_Positional_Accuracy_Explanation:

Fundamental Vertical Accuracy was assessed using 17 ground check points. These check points were not used in the calibration or post processing of the LiDAR point cloud data.

Lineage:

Process_Step:

Process_Description:

Acquisition. Quantum Spatial collected the Teanaway Streams Topobathymetric LiDAR data between 04/30/15 and 05/02/15. The survey used a Riegl VQ820G laser system and a Leica ALS70 laser system mounted in a Cessna Caravan 208B. Data was collected using a single pulse flight plan. Ground level GPS and aircraft IMU were collected during the flight.
Riegl VQ820G Instrument Parameters: Beam diameter: 75 cm, Pulse rate: 284 kHz, Maximum returns: unlimited, Speed: 110 knots, Overlap: 60 %, Field of view (FOV): 42°, Beam wavelength: 532 nm, Frequency of GPS sampling: 2 Hz, Frequency of IMU sampling: 200 Hz, Swath width: 546 m, AGL: 750 m, Average pulse density: 4
Leica ALS70 Instrument Parameters: Beam diameter: 18 cm, Pulse rate: 300 kHz, Maximum returns: 4, Speed: 110 knots, Overlap: 60 %, Field of view (FOV): 40°, Beam wavelength: 1064 nm, Frequency of GPS sampling: 2 Hz, Frequency of IMU sampling: 200 Hz, Swath width: 546 m, AGL: 750 m, Average pulse density: 8

Process_Date: 20150502

Process_Step:

Process_Description:

Bathymetric LiDAR 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 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. 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. 5. Data was processed with a combination of manual and automated techniques using both Riegl software and in-house proprietary software to refract water returns and classify ground and bathymetric returns. 6. The corrected and filtered return points were compared to ground survey points to verify the vertical accuracy. 7. Points were output as laser points, TINed and GRIDed surfaces

Process_Date: 20151110

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 368

Column_Count: 1160

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: NAD 1983 HARN StatePlane Washington South FIPS 4602 Feet

Lambert_Conformal_Conic:

Standard_Parallel: 45.83333333333334

Standard_Parallel: 47.33333333333334

Longitude_of_Central_Meridian: -120.5

Latitude_of_Projection_Origin: 45.33333333333334

False_Easting: 1640416.666666667

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000000026454105572781834

Ordinate_Resolution: 0.000000026454105572781834

Planar_Distance_Units: foot_us

Geodetic_Model:

Horizontal_Datum_Name: D North American 1983 HARN

Ellipsoid_Name: GRS 1980

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257222101

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Puget Sound LiDAR Consortium

Contact_Person: Christy Lam

Contact_Address:

Address_Type: unknown

Address: 1011 Western Ave., Suite 500

City: Seattle

State_or_Province: Washington

Postal_Code: 98104

Country: US

Contact_Voice_Telephone: 206-971-3283

Distribution_Liability:

Please contact Puget Sound LiDAR Consortium for information regarding the use of this data.

Metadata_Reference_Information:

Metadata_Date: 20151229

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Quantum Spatial

Contact_Address:

Address_Type: mailing and physical

Address: 517 SW 2nd St., Suite 400

City: Corvallis

State_or_Province: OR

Postal_Code: 97333

Country: US

Contact_Voice_Telephone: 541-752-1204

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time