q46122d81be

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: WSI
Title: q46122d81be
Geospatial_Data_Presentation_Form: raster digital data
Description:
Abstract:
This dataset represents portions of the Chehalis River Watershed in Greys Harbor, Thurston, Lewis, & Cowlitz counties, WA. This bare earth digital elevation model (DEM) represent the earth's surface with all vegetation and human-made structures removed. The bare earth DEMs were derived from LiDAR data using TIN processing of the ground point returns. The DEM grid cell size is 3 feet. The elevation units are in US survey feet. Some elevation values have been interpolated across areas in the ground model where there is no elevation data (e.g. over water, under dense vegetation). WSI collected the LiDAR and created this data set for the Puget Sound LiDAR Consortium, Federal Emergency Management Agency Region X, Washington Department of Natural Resources and Lewis County on 1/28/12-02/07/12, 03/04/12-03/09/12, 04/07/12.
Purpose:
Provide high resolution terrain elevation and land cover elevation data.
Supplemental_Information:
This data is assembled by 1/4th USGS Quads and projected into Washington State Plane South, FIPS 4602, US Survey Feet.
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -123.002873
East_Bounding_Coordinate: -122.986889
North_Bounding_Coordinate: 46.500225
South_Bounding_Coordinate: 46.437266
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: elevation data
Theme_Keyword: digital terrain model
Theme_Keyword: DEM
Theme_Keyword: bare ground
Theme_Keyword: topography
Theme_Keyword: Chehalis River Watershed
Theme_Keyword: LiDAR
Theme_Keyword: Puget Sound LiDAR Consortium
Theme_Keyword: Light Detection and Ranging
Theme_Keyword: DTM
Theme_Keyword: bare earth
Theme_Keyword: high-resolution
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Pacific Northwest
Place_Keyword: Washington
Place_Keyword: Chehalis River
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. Elevation values for open water surfaces are not valid elevation values because few LiDAR points are returned from water surfaces. Triangles were created across water surfaces by interpolating from the nearest land points.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: WSI
Contact_Address:
Address_Type: mailing and physical
Address: 517 SW 2nd Ave., Suite 400
City: Corvallis
State_or_Province: OR
Postal_Code: 97333
Contact_Voice_Telephone: 541-752-1204
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Puget Sound LiDAR Consortium
Contact_Person: Diana Martinez
Contact_Address:
Address_Type: mailing
Address: 1011 Western Ave., Suite 500
City: Seattle
State_or_Province: Washington
Postal_Code: 98104
Contact_Electronic_Mail_Address: dmartinez@psrc.org
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: FEMA Region X
Contact_Person: Kelly Stone
Contact_Address:
Address_Type: unknown
Address: 20700 44th Ave. W. Suite 110
City: Lynnwood
State_or_Province: WA
Postal_Code: 98036
Contact_Electronic_Mail_Address: kelly.stone@fema.dhs.gov
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Washington DNR
Contact_Person: Terry Curtis
Contact_Address:
Address_Type: mailing
Address: 1111 Washington Street SE, Third floor
City: Olympia
State_or_Province: WA
Postal_Code: 98504
Contact_Electronic_Mail_Address: TERRY.CURTIS@dnr.wa.gov
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Lewis County
Contact_Person: Matt Hyatt
Contact_Address:
Address_Type: mailing
Address: 2025 NE Kresky Avenue
City: Chehalis
State_or_Province: WA
Postal_Code: 98532
Contact_Electronic_Mail_Address: Matt.Hyatt@lewiscountywa.gov
Data_Set_Credit:
Diana Martinez, Puget Sound LiDAR Consortium Federal Emergency Management Agency Region X Washington Department of Natural Resources Lewis County WSI
Native_Data_Set_Environment:
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcGIS 10.0.3.3600
Data_Quality_Information:
Logical_Consistency_Report:
LiDAR flight lines have been examined to ensure that there was at least 60% sidelap, there are no gaps between flightlines, and overlapping flightlines have consistent elevation values. Shaded relief images have been visually inspected for data errors such as pits, border artifacts, gaps, and shifting. The data was examined at a 1:2000 scale.
Completeness_Report:
LiDAR data has been collected and processed for all areas within the project study area.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Explanation: See LiDAR data report.
Positional_Accuracy:
Vertical_Positional_Accuracy:
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: RMSE = 0.028 meters (0.092 feet)
Vertical_Positional_Accuracy_Explanation:
The Root Mean Square Error (RMSE) of the data set is 0.028 meters (0.092 feet). Accuracy was assessed using 4331 ground survey RTK (real time kinematic) points. Please see LiDAR data report for a discussion of statistics related to these datasets.
Lineage:
Process_Step:
Process_Description:
Acquisition. The LiDAR data was collected January 28th-February 7th, March 4th-March 9th, march 21st-March 23rd, and April 7th, 2012. The survey used both a Leica ALS 60 and Optech Orion laser systems mounted in a Cessna Caravan 208B. 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.
Process_Step:
Process_Description:
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 ALS Post Processor software, IPAS Pro GPS/INS software, and Waypoint GPS, 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 output as laser points, TINed and GRIDed surfaces.
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 7622
Column_Count: 1102
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: Diana Martinez
Contact_Address:
Address_Type: mailing
Address: 1011 Western Avenue, Suite 500
City: Seattle
State_or_Province: WA
Postal_Code: 98104
Contact_Voice_Telephone: 206-971-3052
Contact_Electronic_Mail_Address: dmartinez@psrc.org
Distribution_Liability: See access and use constraints information.
Metadata_Reference_Information:
Metadata_Date: 20120821
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: WSI
Contact_Address:
Address_Type: mailing and physical
Address: 517 SW 2nd Ave., Suite 400
City: Corvallis
State_or_Province: OR
Postal_Code: 97333
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
Generated by mp version 2.9.6 on Tue Oct 30 14:59:26 2012