Metadata Sample for 2009 USGS Wenas Valley, WA

Metadata extracted from 2009 USGS Wenas Valley bare earth raster grid be_46120f51

Metadata:


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

Generated by mp version 2.9.6 on Mon Nov 29 10:45:31 2010