gov.noaa.csc.maps:wa2002_willapa
2002 Willapa Bay LiDAR Project
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)
2002 Willapa Bay LiDAR Project
2003-02-27
Charleston, SC
NOAA's Ocean Service, Coastal Services Center (CSC)
http://www.csc.noaa.gov/ldart
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.
CURRENTNESS REFERENCE: Ground condition
SPATIAL DATA ORGANIZATION INFORMATION
Direct Spatial Reference:
Point
SDTS Point and Vector Object Type:
Point
SPATIAL REFERENCE INFORMATION - 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
2002-03-26
2002-04-24
COMPLETE
46.3479
46.7609
-124.277
-123.616
ELEVATION
LiDAR
laser
beach
Bathymetry/Topography
invasive species
spartina alterniflora
DEM
erosion
US
Washington
Willapa Bay
ACCESS CONSTRAINTS:
None
DISTRIBUTION LIABILITY:
Any conclusions drawn from analysis of this information are not the responsibility of NOAA, Coastal Services Center or it's partners.
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:
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.
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.
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.
TECHNICAL CONTACT
DEPARTMENT OF COMMERCE (DOC), NATIONAL OCEANIC AND ATMSOPHERIC ADMINISTRATION (NOAA), NATIONAL OCEAN
SERVICE (NOS), COASTAL SERVICES CENTER (CSC)
2234 South Hobson Avenue
Charleston
South Carolina
29405
United States
DIF AUTHOR
KEIL SCHMID
DEPARTMENT OF COMMERCE (DOC), NATIONAL OCEANIC AND ATMOSHPERIC ADMINISTRATION (NOAA), NATIONAL OCEAN SERVICE (NOS),
COASTAL SERVICES CENTER (CSC)
2234 South Hobson Avenue
Charleston
SC
29405-2413
2008-02-07
2007-08-16
DOC/NOAA/NOS/CSC
Coastal Services Center, National Ocean Service, NOAA, U.S. Department of Commerce
http://www.csc.noaa.gov
______Downloadable_Data
____
DATA CENTER CONTACT
KELLY STROKER
DEPARTMENT OF COMMERCE (DOC), NATIONAL OCEANIC AND ATMOSPHERIC ADMINSTRATION (NOAA), NATIONAL OCEAN SERVICE (NOS),
COASTAL SERVICES CENTER (CSC)
DOC/NOAA/NESDIS/NGDC > NATIONAL GEOPHYSICAL DATA CENTER, NESDIS, NOAA, U.S. DEPARTMENT OF COMMERCE
2234 South Hobson Avenue
Charleston
SC
29405-2413
NOAA/NESDIS/NGDC E/GC1 325 Broadway
Boulder
CO
80305-3328
USA
DOC/NOAA/NESDIS/NGDC
National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
http://www.csc.noaa.gov
______Downloadable_Data
____
DATA CENTER CONTACT
KELLY STROKER
DEPARTMENT OF COMMERCE (DOC), NATIONAL OCEANIC AND ATMOSPHERIC ADMINSTRATION (NOAA), NATIONAL OCEAN SERVICE (NOS),
COASTAL SERVICES CENTER (CSC)
DOC/NOAA/NESDIS/NGDC > NATIONAL GEOPHYSICAL DATA CENTER, NESDIS, NOAA, U.S. DEPARTMENT OF COMMERCE
2234 South Hobson Avenue
Charleston
SC
29405-2413
NOAA/NESDIS/NGDC E/GC1 325 Broadway
Boulder
CO
80305-3328
USA
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
HORIZONTAL POSITIONAL ACCURACY REPORT:
RMSE at 1 sigma = 21 cm
VERTICAL POSITIONAL ACCURACY REPORT:
RMSE at 1 sigma = 12.8 cm
LINEAGE/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.
LINEAGE/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.
LINEAGE/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.
SOURCE USED CITATION ABBREVIATION:
Pre-processing Validation Check - Airport and Project for each mission
PROCESS DATE:
20021105
PROCESS DATE:
20030219
PROCESS DATE:
20071226
LINEAGE/SOURCE INFORMATION:
ORIGINATOR:
NOAA Contract with Spencer B. Gross
.
TITLE:
Willapa Bay LiDAR
.
PUBLICATION DATE: 2002-08-21.
PUBLICATION PLACE:
Portland, OR
.
PUBLISHER:
Spencer B. Gross, Inc.
.
TYPE OF SOURCE MEDIA:
CD-ROM
.
SOURCE TIME PERIOD OF CONTENT/BEGINNING TIME:
20020402
.
SOURCE TIME PERIOD OF CONTENT/ENDING TIME:
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
0.00001
Decimal degrees
0.00001
Decimal degrees
0.01
meters
VIEW EXTENDED METADATA
http://www.ngdc.noaa.gov/nmmr/xmls/xml-to-text.jsp?id=
gov.noaa.csc.maps:wa2002_willapa
View Source Metadata document from the Metadata Manager and Repository (NMMR).
USA/NOAA
ENGLISH
GCMD
CEOS IDN DIF
VERSION 9.0