willapa_river_delivery2_hh

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: 20150430

Title: willapa_river_delivery2_hh

Geospatial_Data_Presentation_Form: raster digital data

Description:

Abstract:

The highest hit digital surface model (DSM) represent the earth's surface elevation with all vegetation and man-made structures included. It was derived from NIR LiDAR data using the highest hit method. Some elevation values have been interpolated across areas in the ground model where there is no elevation data (e.g. over water). Data was processed in reference to NAD83 (CORS96), however the horizontal datum for this dataset is defined as NAD83 (HARN) as the difference is generally small and allows for greater ease of use with data in different datums. 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 Willapa River Valley Delivery 2 LiDAR data for the Puget Sound LiDAR Consortium between 04/10/14 and 12/30/14.

Purpose:

Provide high resolution surface elevation data from the Willapa River Valley Delivery 2 LiDAR dataset.

Supplemental_Information:

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

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20140410

Ending_Date: 20141230

Currentness_Reference: Willapa River Valley Delivery 2 LiDAR

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -123.633803

East_Bounding_Coordinate: -123.275788

North_Bounding_Coordinate: 46.670994

South_Bounding_Coordinate: 46.508685

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: LiDAR

Theme_Keyword: Light detection and ranging

Theme_Keyword: highest hit

Theme_Keyword: vegetation

Theme_Keyword: man-made structures

Theme_Keyword: digital surface model

Theme_Keyword: DSM

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Categories

Theme_Keyword: elevation

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Pacific County, Lewis County

Place_Keyword: Washington

Access_Constraints: None

Use_Constraints:

Elevation values for open water surfaces should be considered approximate due to the increase of laser noise seen over water, frequent lack of returns, and the overall dynamic nature of water.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Puget Sound LiDAR Consortium

Contact_Person: Christy Lam

Contact_Address:

Address_Type: mailing

Address: 1011 Western Ave, Suite 500

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: US

Contact_Voice_Telephone: 206-971-3052

Contact_Electronic_Mail_Address: dmartinez@psrc.org

Data_Set_Credit: Puget Sound LiDAR Consortium

Native_Data_Set_Environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.4.0.5524

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 delivery 2 is 0.163 ft. 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 delivery 2 area.

Positional_Accuracy:

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

The Root Mean Square Error (RMSE) of the vertical accuracy of delivery 2 is 0.121 ft. 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: 0.121

Vertical_Positional_Accuracy_Explanation:

Accuracy was assessed using 1027 ground survey RTK (real time kinematic) and PPK (post processed kinematic) points.

Lineage:

Process_Step:

Process_Description:

Acquisition. Quantum Spatial collected the Willapa River Valley Delivery 2 LiDAR data between 04/10/14 and 12/30/14. The survey used a Leica ALS70 laser system mounted in a Partenavia. Data was collected using a single pulse flight plan. Ground level GPS and aircraft IMU were collected during the flight.
Leica ALS70 Instrument Parameters: Beam diameter: 32 cm, Pulse rate: 180 - 199 kHz, Maximum returns: 4, Speed: 110 knots, Overlap: 70 %, Laser power: 71 %, Field of view (FOV): 30°, Beam wavelength: 1064 nm, Frequency of GPS sampling: 2 Hz, Frequency of IMU sampling: 200 Hz, Swath width: 750 m, AGL: 1400 m, Average pulse density: 8

Process_Date: 20141230

Process_Step:

Process_Description:

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 ALS Post Processor and IPAS TC 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 and PPK ground survey points collected to verify the vertical accuracy. 9. The highest hit algorithm was used to create this highest hit DSM.

Process_Date: 20150430

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 7754

Column_Count: 5509

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: mailing

Address: 1011 Western Ave, Suite 500

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: US

Contact_Voice_Telephone: 206-971-3052

Contact_Electronic_Mail_Address: dmartinez@psrc.org

Distribution_Liability:

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

Metadata_Reference_Information:

Metadata_Date: 20140725

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