2002 Willapa Bay, Washington LiDAR Project

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator:
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)
Publication_Date: 20030227
Title: 2002 Willapa Bay, Washington LiDAR Project
Publication_Information:
Publication_Place: Charleston, SC
Publisher: NOAA's Ocean Service, Coastal Services Center (CSC)
Online_Linkage: <http://www.csc.noaa.gov/ldart>

Description:
Abstract:
NOAA contracted with Spencer B. Gross, Inc. (SBG) to obtain airborne LiDAR of Willapa Bay, Washington during low tide conditions. The LiDAR data was processed to deliver topographic surface elevation data of the exposed intertidal flats and surrounding terrestrial areas.
Purpose:
The elevation data will be used to investigate the impacts of invasive species on the local ecology.

Supplemental_Information:
The tide patterns of Willapa Bay required that the project area be divided into three sections, and LiDAR flights had to be flown in an East/West orientation to capture the low, low tide conditions. As the tidal waters moved throughout the Bay, flights were completed according to tide data provided by the University of California - Davis (Evolution & Ecology Dept.). Flights were completed during all acceptable periods - day or night.
The Willapa Bay, WA LiDAR Data Validation Report may be viewed at: <ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/wa/willapa>
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20020326
Ending_Date: 20020424
Currentness_Reference: Ground condition

Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -124.277
East_Bounding_Coordinate: -123.616
North_Bounding_Coordinate: 46.7609
South_Bounding_Coordinate: 46.3479

Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: Elevation
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: LiDAR
Theme_Keyword: Laser
Theme_Keyword: Beach
Theme_Keyword: Bathymetry/Topography
Theme_Keyword: Invasive species
Theme_Keyword: Spartina alterniflora
Theme_Keyword: DEM
Theme_Keyword: Erosion
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: US
Place_Keyword: Washington
Place_Keyword: Willapa Bay

Access_Constraints: None
Use_Constraints:
Users should be aware that temporal changes may have occurred since this data set was collected and some parts of the data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)
Contact_Position: CEM Project Scientist
Contact_Address:
Address_Type: Mailing and physical address
Address: 2234 South Hobson Avenue
City: Charleston
State_or_Province: South Carolina
Postal_Code: 29405
Country: United States
Contact_Voice_Telephone: 843-740-1200
Contact_Electronic_Mail_Address: tcm@csc.noaa.gov
Data_Set_Credit:
The 2002 Willapa Bay, WA LiDAR data were collected by Spencer B. Gross, Inc. for the National Oceanic and Atmospheric Administration (NOAA) Coastal Services Center and the Washington State Department of Natural Resources.
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Independent ground control points were acquired using static GPS methods in flat open areas throughout the project area. These points were estimated to have a vertical accuracy of 0.02m. The processed LiDAR data were compared to ground control points within the project. LiDAR points surrounding the x-y of each ground control point were located. A triangulated irregular network (TIN) model was created and a z value was interpolated. The interpolated LiDAR z value at ground control x-y was compared to the ground control z. The mean elevation difference for all comparison was used to estimate and remove an elevation bias within the LiDAR data. The elevation bias was determined to be 0.137m. Removal of the bias resulted in a RMSE of 0.128m. Processing steps (datum conversion, projection, grid interpolation, etc.) introduce additional error factors which have not been tested and factored into the reported error.
Logical_Consistency_Report:
LiDAR Specifications: 7,000-feet AMT flight height; 24 degree field of view, 2.84-meter average post-spacing, 2978-foot swaths flown with 30% sidelap, 24,000 pulses per second; 1+1 collection (one return and one intensity value per pulse). LiDAR flown with an ADS40, Leica Geosystems LiDAR system, February 2002 model. The flight consisted of 71 E/W flight lines with 2 N/S cross flight lines for data calibration purposes: 800 flight line miles covering 274 square miles. For each lift, 2 flight lines were flown at the Astoria, OR airport for system calibration purposes.
Completeness_Report: None available

Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: RMSE at 1 sigma = 21 cm

Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: RMSE at 1 sigma = 12.8 cm

Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: NOAA Contract with Spencer B. Gross
Publication_Date: 20020821
Title: Willapa Bay LiDAR
Publication_Information:
Publication_Place: Portland, OR
Publisher: Spencer B. Gross, Inc.
Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20020402
Ending_Date: 20020424
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation:
Pre-processing Validation Check - Airport and Project for each mission
Source_Contribution: Raw LiDAR x-y-z elevation data files

Process_Step:
Process_Description:
The raw LiDAR data was checked for complete coverage following each mission and at the end of the flights. The data was pre-processed using SBG software to correctly establish the position of each x-y-z point. The data was checked again for completeness and conformance to specifications by comparisons to ground surveyed points. The LiDAR data was post-processed using a customized version of TerraSolid software and bare earth terrain models were developed.
Source_Used_Citation_Abbreviation:
Pre-processing Validation Check - Airport and Project for each mission
Process_Date: 20021105
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Mike Renslow
Contact_Organization: Spencer B. Gross, Inc
Contact_Position: Project Manager
Contact_Address:
Address_Type: Mailing and physical address
Address: 13545 NW Science Park Dr
City: Portland
State_or_Province: OR
Postal_Code: 97027
Country: USA
Contact_Voice_Telephone: 503-646-1733
Contact_Facsimile_Telephone: 503-626-4818
Contact_Electronic_Mail_Address: mike@sbgmaps.com
Hours_of_Service: 0700 - 1700

Process_Step:
Process_Description:
The post-processed data from Spencer B. Gross were delivered in Washington State Plane (South) projection referenced to NAD27 with vertical elevations in US survey feet referenced to NGVD29. The data were converted to geographic coordinates using General Cartographic Transformation Program software developed by the United States Geological Survey. The data were then transformed to NAD83 using NADCON grids from the National Geodetic Survey (NGS). A final datum transformation was performed to convert vertical elevations referenced to NGVD29 to NAVD88 using NGS VERTCON grids. A comparison of the LiDAR data to a ground truth data set indicated a 0.137m bias, which was removed. The data were then converted to a binary format and loaded into the LiDAR Data Retrieval Tool (LDART) database.
Process_Date: 20030219
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)
Contact_Position: CEM Project Scientist
Contact_Address:
Address_Type: Mailing and physical address
Address: 2234 South Hobson Avenue
City: Charleston
State_or_Province: South Carolina
Postal_Code: 29405
Country: United States
Contact_Voice_Telephone: 843-740-1200
Contact_Electronic_Mail_Address: tcm@csc.noaa.gov

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257

Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.01
Altitude_Distance_Units: Meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)
Contact_Position: CEM Project Scientist
Contact_Address:
Address_Type: Mailing and physical address
Address: 2234 South Hobson Avenue
City: Charleston
State_or_Province: SC
Postal_Code: 29405-2413
Contact_Voice_Telephone: 843-740-1200
Contact_Electronic_Mail_Address: tcm@csc.noaa.gov
Resource_Description: Downloadable Data
Distribution_Liability:
Any conclusions drawn from analysis of this information are not the responsibility of NOAA, Coastal Services Center or its partners.
Custom_Order_Process:
This data can be obtained on-line at the following URL: <http://www.csc.noaa.gov/ldart> The data set is dynamically generated based on user-specified parameters.
Metadata_Reference_Information:
Metadata_Date: 20030320
Metadata_Review_Date: 20080612
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)
Contact_Position: CEM Project Scientist
Contact_Address:
Address_Type: Mailing and physical address
Address: 2234 South Hobson Avenue
City: Charleston
State_or_Province: SC
Postal_Code: 29405-2413
Contact_Voice_Telephone: 843-740-1200
Contact_Electronic_Mail_Address: tcm@csc.noaa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.9.1 on Thu Jun 12 10:43:49 2008