Metadata Sample for 2009 USGS Wenas Valley, WA

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.

Originator: Puget Sound LiDAR Consortium

Publication_Date: September 28, 2010

Title: be_46120f51

Geospatial_Data_Presentation_Form: raster digital data

Online_Linkage:

\\lidar\data\Drive4\pslc2009\usgs_wenas\delivery_2\dems\be\be_46120f51

Description:

Abstract:

The dataset encompasses portions of Wenas Valley in Kitittas and Yakima Counties, Washington.
The bare earth digital elevation models (DEMs) 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. Some elevation values have been interpolated across areas in the ground model where there is no elevation data (e.g. over dense vegetation).
The DEM grid cell size is 3-ft. The projection is NAD83 (HARN) Washington State Plane, South. The elevation units are in U.S. Survey Feet.
Watershed Sciences, Inc. collected the LiDAR and created this data set for the Puget Sound LiDAR Consortium.

Purpose:

Provide high resolution terrain elevation and land cover elevation data.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 9/28/2010

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -120.625084

East_Bounding_Coordinate: -120.562467

North_Bounding_Coordinate: 46.750054

South_Bounding_Coordinate: 46.717904

Keywords:

Theme:

Theme_Keyword: LiDAR

Theme_Keyword: Light Detection and Ranging

Theme_Keyword: DEM

Theme_Keyword: digital terrain model

Theme_Keyword: elevation data

Theme_Keyword: topography

Theme_Keyword: bare earth

Theme_Keyword: high-resolution

Theme_Keyword: bare ground

Theme_Keyword: DTM

Place:

Place_Keyword: Washington

Place_Keyword: Yakima County

Place_Keyword: Kitittas County

Place_Keyword: Wenas Valley

Place_Keyword: Wenas 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: Puget Sound LiDAR Consortium

Contact_Person: Diana Martinez

Contact_Address:

Address_Type: mailing and physical address

Address: 1011 Western Ave.

Address: Suite 500

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: USA

Contact_Voice_Telephone: 206-971-3052

Contact_Electronic_Mail_Address: dmartinez@psrc.org

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000

Data_Quality_Information:

Logical_Consistency_Report:

LiDAR flight lines have been examined to ensure that there was at least 60% sidelap, there are minimal 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 = 0.17ft

Vertical_Positional_Accuracy_Explanation:

The Root Mean Square Error (RMSE) of the data set is 0.17ft. Accuracy was assessed using 3120 ground survey (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 on October 28th, 2009, March 22, 2010 and June 12th-16th, 2010. The survey used both the Leica ALS50 Pase II and ALS 60 laser systems mounted in a Cessna Caravan 208. 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: 3902

Column_Count: 5229

Vertical_Count: 1

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Lambert Conformal Conic

Lambert_Conformal_Conic:

Standard_Parallel: 45.833333

Standard_Parallel: 47.333333

Longitude_of_Central_Meridian: -120.500000

Latitude_of_Projection_Origin: 45.333333

False_Easting: 1640416.666667

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: row and column

Coordinate_Representation:

Abscissa_Resolution: 3.000000

Ordinate_Resolution: 3.000000

Planar_Distance_Units: survey feet

Geodetic_Model:

Horizontal_Datum_Name: D_North_American_1983_HARN

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

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 LiDAR Consortium

Contact_Person: Diana Martinez

Contact_Address:

Address_Type: mailing and physical address

Address: 1011 Western Ave

Address: Suite 500

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: USA

Contact_Voice_Telephone: 206-971-3052

Contact_Electronic_Mail_Address: dmartinez@psrc.org

Resource_Description: Downloadable Data

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size: 83.992

Metadata_Reference_Information:

Metadata_Date: 20101129

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Watershed Sciences, Inc.

Contact_Address:

Address_Type: mailing address

Address: 517 SW 2nd Street

City: Corvallis

State_or_Province: OR

Postal_Code: 97333

Country: USA

Contact_Voice_Telephone: 541-752-1204

Contact_Electronic_Mail_Address: watershedsciences.com

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile