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Short Citation:
Office for Coastal Management, 2022: 2002 NOAA Lidar: Willapa Bay, WA Mudflat (WA),

Item Identification

Title: 2002 NOAA Lidar: Willapa Bay, WA Mudflat (WA)
Short Name: wa2002_noaa_willapa_mudflat_m12_metadata
Status: Completed
Publication Date: 2003-02-27

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.

Original contact information:

Contact Org: NOAA Office for Coastal Management

Phone: 843-740-1202



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 project boundary may be viewed at:

The Willapa Bay, WA Lidar Data Validation Report may be viewed at:


Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
Global Change Master Directory (GCMD) Science Keywords
Global Change Master Directory (GCMD) Science Keywords
ISO 19115 Topic Category
None Beach
None Erosion
None Invasive species
None Spartina alterniflora

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Distribution Liability:

Any conclusions drawn from analysis of this information are not the responsibility of NOAA, Office for Coastal Management

or its partners.

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) Office for Coastal Management and the Washington State Department of Natural Resources.

Support Roles

Data Steward

CC ID: 625433
Date Effective From: 2003-02-27
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


CC ID: 625435
Date Effective From: 2003-02-27
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Metadata Contact

CC ID: 625436
Date Effective From: 2003-02-27
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Point of Contact

CC ID: 625434
Date Effective From: 2003-02-27
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1132914
W° Bound: -124.277
E° Bound: -123.616
N° Bound: 46.7609
S° Bound: 46.3479

Extent Group 1 / Time Frame 1

CC ID: 1132913
Time Frame Type: Range
Start: 2002-03-26
End: 2002-04-24

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Data Access Procedure:

This data can be obtained on-line at the following URL:

The data set is dynamically generated based on user-specified parameters.


Data Access Constraints:


Data 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.

Distribution Information

Distribution 1

CC ID: 744054
Download URL:
File Name: Customized Download

Create custom data files by choosing data area, product type, map projection, file format, datum, etc.

Distribution 2

CC ID: 744055
Download URL:
File Name: Bulk Download

Simple download of data files.



CC ID: 744057
URL Type:
Online Resource


CC ID: 744058
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 625457
Activity Date/Time: 2016-05-23

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 625456
Activity Date/Time: 2017-11-14

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using '' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 718009
Activity Date/Time: 2018-02-08

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 744056
Activity Date/Time: 2018-03-13

Partial upload to move data access links to Distribution Info.

Data Quality


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.

Horizontal Positional Accuracy:

RMSE at 1 sigma = 21 cm

Vertical Positional Accuracy:

RMSE at 1 sigma = 12.8 cm

Completeness Report:

None available

Conceptual Consistency:

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.



Willapa Bay Lidar

CC ID: 1132909
Publish Date: 2002-08-21
Extent Type: Range
Extent Start Date/Time: 2002-04-02
Extent End Date/Time: 2002-04-24
Source Contribution:

Raw Lidar x-y-z elevation data files | Type of Source Media: CD-ROM

Process Steps

Process Step 1

CC ID: 1132910

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.

Process Date/Time: 2002-11-05 00:00:00
Source: Willapa Bay Lidar

Process Step 2

CC ID: 1132911

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/Time: 2003-02-19 00:00:00

Catalog Details

Catalog Item ID: 48221
GUID: gov.noaa.nmfs.inport:48221
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-14 14:20+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2022-03-16
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-03-16
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-03-16