Metadata Sample for 2009 Lewis County

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: Puget Sound LiDAR Consortium

Originator: Watershed Sciences, Inc.

Publication_Date: 2009

Title: be3_46121f71

Geospatial_Data_Presentation_Form: raster digital data

Online_Linkage: \\WINXP\F$\Final_Rasters\3ft\MOS\03_Clip_mask_snap\be3_46121f71

Description:

Abstract:

The dataset covers portions of Lewis County in Southwestern Washington State.
The bare earth digital elevation models (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 three feet. The elevation units are in 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 LiDAR Consortium.

Purpose:

Provide high resolution terrain elevation and land cover elevation data.

Supplemental_Information: This data is assembled into 3.75-minute USGS quadrangles.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 07/18/2009

Ending_Date: 07/20/2009

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -121.876569

East_Bounding_Coordinate: -121.810993

North_Bounding_Coordinate: 46.750171

South_Bounding_Coordinate: 46.687058

Keywords:

Theme:

Theme_Keyword_Thesaurus:

REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords.

Theme_Keyword: LiDAR

Theme_Keyword: Light Detection and Ranging

Theme_Keyword: DEM

Theme_Keyword: digital terrain model

Theme_Keyword: puget sound lidar consortium

Theme_Keyword: elevation data

Theme_Keyword: topography

Theme_Keyword: bare earth

Theme_Keyword: high-resolution

Theme_Keyword: DTM

Place:

Place_Keyword: Washington

Place_Keyword: Washington State

Place_Keyword: Lewis County

Place_Keyword: Pacific Northwest

Place_Keyword: Western Washington

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 / Puget Sound Regional Council

Contact_Address:

Address: 1011 Western Avenue, Suite 500

City: Seattle

State_or_Province: WA

Postal_Code: 98104-1035

Country: USA

Contact_Voice_Telephone: 206-464-5325

Data_Set_Credit:

Puget Sound LiDAR Consortium (PSLC). The PSLC is supported by the Puget Sound Regional Council, the National Aeronautical and Space Administration (NASA), the United States Geological Survey (USGS) and partners in the local, state, and tirbal government. For more information, visit <http://pugetsoundlidar.ess.washington.edu/>.

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850

Data_Quality_Information:

Logical_Consistency_Report:

LiDAR flight lines have been examined to ensure that there was at least 50% 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 1:3500 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 = 0.10 feet

Vertical_Positional_Accuracy_Explanation:

The Root Mean Square Error (RMSE) of the data set is 0.10 feet. Accuracy was assessed using 622 ground survey (real time kinematic) points. See LiDAR data report.

Lineage:

Process_Step:

Process_Description:

Acquisition.
The LiDAR data was collected during July 2009. Greater than 8 points per square meter and near nadir scan angles were used to increase penetration of vegetation to ground surfaces. Spot spacing was less than or equal to 34 centimeters. 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 the IPAS survey suite and ALS Post Processing 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 software tools 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 broken into processing bins and output areas and output as laser points, TINed and GRIDed surfaces. Bare earth DEMs meet PSLC specifications.

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation: Z:\pslc2009\GRID_METADATA_PER_DELIVERY\DEL2\BARE_EARTH_3FT.xml

Process_Date: 20091210

Process_Time: 10524900

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 7582

Column_Count: 5354

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:

Entity_Type_Label: All

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 / Puget Sound Regional Council

Contact_Address:

Address: 1011 Western Avenue, Suite 500

City: Seattle

State_or_Province: WA

Postal_Code: 98104-5325

Country: USA

Contact_Voice_Telephone: 206-464-5325

Resource_Description: Downloadable Data

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size: 155.926

Metadata_Reference_Information:

Metadata_Date: 20090921

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Watershed Sciences, Inc.

Contact_Person: REQUIRED: The person responsible for the metadata information.

Contact_Address:

Address_Type: mailing address

Address: 529 SW 3rd Ave, Suite 300

City: Portland

State_or_Province: OR

Postal_Code: 97204

Country: USA

Contact_Voice_Telephone: 971-223-5152

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

Metadata_Extensions:

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

Profile_Name: ESRI Metadata Profile