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 LiDAR Project
Publication Information:
Publication Place:
Charleston, SC
Publisher:
NOAA's Ocean Service, Coastal Services Center (CSC)
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.
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no longer represent actual surface conditions.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 it's limitations.
Point of Contact:
Contact Information:
Contact Organization Primary:
Contact Organization:
Department of Commerce (DOC), National Oceanic and Atmsopheric Administration (NOAA), National Ocean
Service (NOS), Coastal Services Center (CSC)
Contact Position:
TCM 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.
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 indciated 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:
TCM Project Scientist
Contact Address:
Address Type:
mailing and physical
Address:
2234 South Hobson Avenue
City:
Charleston
State or Province:
South Carolina
Postal Code:
29405
Contact Voice Telephone:
843-740-1200
Contact Electronic Mail Address:
tcm@csc.noaa.gov
Process Step:
Process Description:
The NOAA National Geophysical Data Center (NGDC) received Lidar data files on external harddrive. The disk contains LiDAR data from the NOAA Coastal Services Center. This data is currently being served via LDART at http://www.csc.noaa.gov/ldart . This data can be used to re-populate the system.
Process Date:
20071226
Process Contact:
Contact Information:
Contact Organization Primary:
Contact Organization:
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Department of Commerce (DOC), National Oceanic and Atmospheric Adminstration (NOAA), National Ocean Service (NOS),
Coastal Services Center (CSC)
Contact Position:
TCM 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 it's partners.
Custom Order Process:
This data can be obtained on-line at the following URL: http://maps.csc.noaa.gov/TCM/. The data set is dynamically generated based on
user-specified parameters.
Distributor:
Contact Information:
Contact Organization Primary:
Contact Organization:
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Contact Person:
Kelly Stroker
Contact Address:
Address Type:
Mailing and Physical Address
Address:
NOAA/NESDIS/NGDC E/GC1 325 Broadway
City:
Boulder
State or Province:
CO
Postal Code:
80305-3328
Country:
USA
Contact Voice Telephone:
(303) 497-4603
Contact TDD/TTY Telephone:
(303) 497-6958
Contact Facsimile Telephone:
(303) 497-6513
Contact Electronic Mail Address:
kelly.stroker@noaa.gov
Hours of Service:
7:30-5:00 Mountain
Contact Instructions:
Contact Data Center
Distribution Liability:
Disclaimer While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Custom Order Process:
The National Geophysical Data Center serves as the archive for this LIDAR data. NGDC should only be contacted for this data if it cannot be obtained from NOAA Coastal Services Center.
