Metadata Sample for 2009 Snohomish River Estuary

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 Consortum

Originator: Douglas County PUD

Publication_Date: 2009

Title: be_47122g11

Geospatial_Data_Presentation_Form: raster digital data

Online_Linkage:

\\lidar\data\Drive4\pslc2009\snohomish_river_estuary\dem\Bare_Earth\be_47122g11

Description:

Abstract:

The dataset encompasses portions of Snohomish County, WA. 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 3 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 Snohomish County PUD requested through the Puget Sound LiDAR Consortium (PSLC).

Purpose:

Provide high resolution terrain elevation and land cover elevation data.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 06/20/2009

Ending_Date: 06/21/2009

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -122.103139

East_Bounding_Coordinate: -122.064499

North_Bounding_Coordinate: 47.875417

South_Bounding_Coordinate: 47.850676

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 Consortum

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: Pacific Northwest

Place_Keyword: Washington

Place_Keyword: Snohomish

Place_Keyword: Snohomish County

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 Consortum

Contact_Person: Diana Martinez

Contact_Address:

Address_Type: mailing and physical address

Address: 1011 Western Ave

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: USA

Contact_Voice_Telephone: 206.971.3052

Data_Set_Credit: Puget Sound LiDAR Consortum

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 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 1:2000 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 = 0.030 meters (0.099 feet)

Vertical_Positional_Accuracy_Explanation:

The Root Mean Square Error (RMSE) of the data set is 0.030 meters (0.099 feet). Accuracy was assessed using 806 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 between July 20 and July 21, 2009. The survey used a Leica ALS50 Pase II laser system 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.

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation:

\\10.6.0.254\data\1META_DATA_TEMPLATE\DouglasCo_Wenatchee\be_metadata.xml

Process_Date: 20091012

Process_Time: 08262300

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation:

G:\Snohomish_Deliverables\Rasters\Bare_Earth\be_47122g11\metadata.xml

Process_Date: 20091117

Process_Time: 16275300

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation: H:\Rasters\bare_earth\be_47122G11.img.xml

Process_Date: 20091118

Process_Time: 11591300

Process_Step:

Process_Description: Dataset copied.

Source_Used_Citation_Abbreviation: F:\Snohomish\Client_issues\mosaics_new\be_47122g11

Process_Date: 20091118

Process_Time: 12070000

Process_Step:

Process_Description: Dataset copied.

Source_Used_Citation_Abbreviation: F:\pslc2009\sre_dem_edits\be_dem\be_47122g11

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 2958

Column_Count: 3114

Vertical_Count: 1

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Lambert Conformal Conic

Lambert_Conformal_Conic:

Standard_Parallel: 47.500000

Standard_Parallel: 48.733333

Longitude_of_Central_Meridian: -120.833333

Latitude_of_Projection_Origin: 47.000000

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

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: USA

Contact_Voice_Telephone: 206.971.3052

Resource_Description: Downloadable Data

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size: 40.535

Metadata_Reference_Information:

Metadata_Date: 20100121

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: 257 B SW Madison Ave

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