gov.noaa.csc.maps:wa2002_willapa Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC) 20030227 Charleston, SC NOAA's Ocean Service, Coastal Services Center (CSC) http://www.csc.noaa.gov/ldart 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. The elevation data will be used to investigate the impacts of invasive species on the local ecology. 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. 20020326 20020424 Ground condition Complete None planned -124.277 -123.616 46.7609 46.3479 ISO 19115 Topic Category Elevation None LiDAR laser beach Bathymetry/Topography invasive species spartina alterniflora DEM erosion None US Washington Willapa Bay None 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be aware that temporal changes may have occurred since this data set was collected and some parts of the data may no longer represent actual surface conditions.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. Department of Commerce (DOC), National Oceanic and Atmsopheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC) TCM Project Scientist mailing and physical address

2234 South Hobson Avenue

Charleston South Carolina 29405 United States 843-740-1200 tcm@csc.noaa.gov 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. 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. None available RMSE at 1 sigma = 21 cm RMSE at 1 sigma = 12.8 cm NOAA Contract with Spencer B. Gross 20020821 Portland, OR Spencer B. Gross, Inc. CD-ROM 20020402 20020424 ground condition Pre-processing Validation Check - Airport and Project for each mission Raw LiDAR x-y-z elevation data files 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. Pre-processing Validation Check - Airport and Project for each mission 20021105 Mike Renslow Spencer B. Gross, Inc Project Manager mailing and physical address

13545 NW Science Park Dr

Portland OR 97027 USA 503-646-1733 503-626-4818 mike@sbgmaps.com 0700 - 1700 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. 20030219 Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC) TCM Project Scientist mailing and physical

2234 South Hobson Avenue

Charleston South Carolina 29405 843-740-1200 tcm@csc.noaa.gov 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. 20071226 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Kelly Stroker Mailing and Physical Address

NOAA/NESDIS/NGDC E/GC1 325 Broadway

Boulder CO 80305-3328 USA (303) 497-4603 (303) 497-6958 (303) 497-6513 kelly.stroker@noaa.gov 7:30-5:00 Mountain Contact Data Center Point Point 0.00001 0.00001 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137 298.257 North American Vertical Datum of 1988 0.01 meters Explicit elevation coordinate included with horizontal coordinates Department of Commerce (DOC), National Oceanic and Atmospheric Adminstration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC) TCM Project Scientist mailing and physical address

2234 South Hobson Avenue

Charleston SC 29405-2413 843-740-1200 tcm@csc.noaa.gov Downloadable Data Any conclusions drawn from analysis of this information are not the responsibility of NOAA, Coastal Services Center or it's partners. 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. DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Kelly Stroker Mailing and Physical Address

NOAA/NESDIS/NGDC E/GC1 325 Broadway

Boulder CO 80305-3328 USA (303) 497-4603 (303) 497-6958 (303) 497-6513 kelly.stroker@noaa.gov 7:30-5:00 Mountain Contact Data Center 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. 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. 20080207 20070816 Department of Commerce (DOC), National Oceanic and Atmoshperic Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC) Keil Schmid TCM Project Scientist mailing and physical address

2234 South Hobson Avenue

Charleston SC 29405-2413 843-740-1200 tcm@csc.noaa.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998