be_46120g81

Metadata:

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

Identification_Information:

Citation:

Citation_Information:

Originator: Watershed Sciences, Inc.

Title: be_46120g81

Geospatial_Data_Presentation_Form: raster digital data

Description:

Abstract:

This dataset represents the Upper Naches River and Nile Slide Study Area of the Naches River in Yakima County, 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, over dense vegetation). Watershed Sciences, Inc. collected the LiDAR and created this data set for the Puget Sound Regional Council.

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.

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -121.000206

East_Bounding_Coordinate: -120.937101

North_Bounding_Coordinate: 46.875263

South_Bounding_Coordinate: 46.813083

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: DTM

Theme_Keyword: Puget Sound LiDAR Consortium

Theme_Keyword: bare earth

Theme_Keyword: Nile Slide

Theme_Keyword: high-resolution

Theme_Keyword: LiDAR

Theme_Keyword: topography

Theme_Keyword: Light Detection and Ranging

Theme_Keyword: DEM

Theme_Keyword: elevation data

Theme_Keyword: bare ground

Theme_Keyword: digital terrain model

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Categories

Theme_Keyword: elevation

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Yakima County

Place_Keyword: Washington

Place_Keyword: Naches River

Place_Keyword: Pacific Northwest

Place_Keyword: Nile

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: Puget Sound Regional Council

Contact_Person: Diana Martinez

Contact_Address:

Address_Type: mailing and physical

Address: 1011 Western Avenue, 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 Regional Council

Native_Data_Set_Environment:

Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.1.3497

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.

Vertical_Positional_Accuracy:

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: RMSE = 0.025meters (0.082 feet)

Vertical_Positional_Accuracy_Explanation:

The Root Mean Square Error (RMSE) of the data set is 0.025 meters (0.082 feet). Accuracy was assessed using 656 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 September 30th-October 1st, 2011 & April 5th, 2012. The survey used a Leica ALS 60 laser system 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: Grid Cell

Row_Count: 7528

Column_Count: 5219

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

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Attribute:

Attribute_Label: ObjectID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Value

Attribute:

Attribute_Label: Count

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Puget Sound Regional Council

Contact_Person: Diana Martinez

Contact_Address:

Address_Type: mailing and physical

Address: 1011 Western Avenue, 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: See access and use constraints information.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: Raster Dataset

Transfer_Size: 154.679

Digital_Transfer_Option:

Metadata_Reference_Information:

Metadata_Date: 20140109

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Watershed Sciences, Inc.

Contact_Address:

Address_Type: mailing

Address: 517 SW 2nd Ave, Suite 400

City: Corvallis

State_or_Province: OR

Postal_Code: 97333

Country: US

Contact_Voice_Telephone: 541-752-1204

Contact_Electronic_Mail_Address: watershedsciences.com

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time