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Short Citation:
OCM Partners, 2024: Topobathymetric Model of the Northern Gulf of Mexico, 1888 to 2013, https://www.fisheries.noaa.gov/inport/item/49466.

Item Identification

Title: Topobathymetric Model of the Northern Gulf of Mexico, 1888 to 2013
Short Name: topobathy_mdl_nrthngulf_of_mexico_metadata_4958
Status: Completed
Publication Date: 2014
Abstract:

Accurate, high-resolution elevation information is vital to understanding the highly dynamic Northern Gulf Coast,

with Louisiana being the location of North America's largest delta system, and the focus of one of the largest coastal restoration

and flood risk reduction efforts in the U.S. (State of Louisiana, 2012). The U.S. Geological Survey's (USGS) Coastal and Marine

Geology Program (CMGP) and the National Geospatial Program (NGP) collaborated with the Coastal Protection and Restoration

Authority of Louisiana (CPRA) and a number of other federal and state agencies to create a comprehensive topobathymetric

elevation model for the Northern Gulf of Mexico (NGOM). The new dataset consists of a detailed and highly accurate elevation model

incorporating the best available multi-source topographic and bathymetric elevation data for the Northern Gulf of Mexico (NGOM).

The NGOM topobathymetric elevation model integrates over 400 different data sources including topographic and bathymetric LiDAR

point clouds, hydrographic surveys, side-scan sonar surveys, and multibeam surveys obtained from USGS, NOAA, the State of Louisiana,

the U.S. Army Corps of Engineers, FEMA, and other agencies.

The LiDAR and bathymetry surveys were sorted and prioritized based on survey date, accuracy, spatial distribution, and point density to

develop a model based on the best available elevation data. Because bathymetric data is typically referenced to tidal datums (such as

Mean High Water or Mean Sea Level), all tidally-referenced heights were transformed into orthometric heights that are normally used

for mapping elevation on land (based on the North American Vertical Datum of 1988). The spatial resolution is 3 meters and extends from

the Florida/Alabama border on the east to the Louisiana/Texas border on the west. The temporal range of the input topography and

bathymetry is 1888 to 2013.

Original contact information:

Contact Name: Jeffrey Danielson

Contact Org: U.S. Geological Survey

Title: Physical Geographer

Phone: 605-594-6148

Email: daniels@usgs.gov

Purpose:

As a collaboration between the U.S. Geological Survey (USGS) Coastal and Marine Geology Program (CMGP), the National

Geospatial Program (NGP), and the NOAA National Geophysical Data Center (NGDC), the CoNED Project integrates disparate light detection

and ranging (LiDAR) and bathymetric data sources into a common database aligned both vertically and horizontally to a common reference system.

CoNED Project TBDEM elevation model development is focused in select regions around the U.S. Coast, such as in the Northern Gulf of

Mexico (NGOM), the Hurricane Sandy Region, the San Francisco Bay Region, the Pacific Northwest, and the North Slope of Alaska.

CoNED Project topobathymetric elevation models (TBDEM) provide a required seamless elevation product for several science application studies such

as shoreline delineation, coastal inundation mapping, sediment-transport, sea-level rise, storm surge models, tsunami impact assessment, and also

to analyze the impact of various climate change scenarios on coastal regions. The raster elevation topobathymetric elevation product, the Federal

Geographic Data Committee (FGDC) metadata, and the spatially referenced metadata are contained in the downloadable bundle. Spatially referenced

metadata are contained within an ESRI shapefile that contains footprints for each of the source input areas.

The National Map provides basic elevation information for earth science studies and mapping applications in the United States. The data are utilized

by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, and mapping and

visualization applications.

References:

USGS

Gesch, D.B., 2007, The National Elevation Dataset, in Maune, D., ed., Digital Elevation Model Technologies and Applications:

The DEM Users Manual, 2nd Edition, in Digital Elevation Model Technologies and Applications: The DEM Users Manual, 2nd Edition,

Bethesda, Maryland, American Society for Photogrammetry and Remote Sensing, p. 99-118.

Barrier Island Comprehensive Monitoring Program (BICM)

Bonisteel-Cormier, J.M., Wright, C.W., Fredericks, Xan, Klipp, E.S., Nagle, D.B., Sallenger, A.H., and Brock, J.C., 2013,

EAARL coastal topography and imagery-Western Louisiana, post-Hurricane Rita, 2005: first surface: U.S. Geological Survey Data

Series 720, 1 DVD, http://pubs.usgs.gov/ds/720.

Hansen, M., and Howd, P., 2009, Louisiana barrier-island comprehensive monitoring program (BICM) - Volume 4: Louisiana light detection

and ranging data (lidar) Part 1: Lidar systems and data processing techniques: Prepared for the Louisiana Department of Natural Resources,

Coastal Restoration Division by the University of New Orleans, Pontchartrain Institute for Environmental Sciences, New Orleans, Louisiana, 22 p.

NOAA TBDEM and Bathymetry

Love, M., Amante, C., Eakins, B., and Taylor, L., 2010a, Digital elevation models of New Orleans, Louisiana: Procedures, data sources and

analysis, report, 44 pp: U.S. Dept. of Commerce NOAA Technical Memorandum NESDIS NGDC-49, 46 p.

Love, M., Amante, C., Eakins, B., and Taylor, L., 2010b, Digital Elevation Models of the Northern Gulf Coast: Procedures, Data Sources and

Analysis: U.S. Dept. of Commerce NOAA Technical Memorandum NESDIS NGDC-59, 43 p.

Love, M., Caldwell, R.J., Eakins, B., and Taylor, L., 2010, Digital Elevation Models of Southern Louisiana: U.S. Dept. of Commerce

NOAA Technical Memorandum NESDIS NGDC-49, 40 p.

National Geophysical Data Center, 2001. U.S. Coastal Relief Model - Central Gulf of Mexico, 2001, National Geophysical Data Center,

NOAA NOAA Technical Memorandum NESDIS NGDC-59.

Experimental Advanced Airborne Research Lidar (EAARL)

Bonisteel-Cormier, J.M., Nayegandhi, Amar, Fredericks, Xan, Wright, C.W., Brock, J.C., Nagle, D.B., Vivekanandan, Saisudha, and

Barras, J.A., 2012, EAARL coastal topography-North Shore, Lake Pontchartrain, Louisiana, 2010: U.S. Geological Survey Data Series 674, 1p.,

available at http://pubs.usgs.gov/ds/674/

Nayegandhi, A., Bonisteel-Cormier, J.M., Wright, C.W., Brock, J.C., Nagle, D.B., Vivekanandan, S., Fredericks, X., and Barras, J.A., 2012,

EAARL coastal topography-Alligator Point, Louisiana: US Department of the Interior, US Geological Survey Data Series 665, 1 p,

available at http://pubs.usgs.gov/ds/665/

Nayegandhi, A., Fredericks, X., Bonisteel-Cormier, J.M., Wright, C.W., Brock, J.C., Nagle, D.B., Vivekanandan, S., and Barras, J.A., 2010,

EAARL coastal topography-Central Wetlands, Louisiana, 2010: US Department of the Interior, US Geological Survey Data Series 665, 1 p.,

available at http://pubs.usgs.gov/ds/673/

Notes:

12059

Supplemental Information:

The data obtained through Earth Explorer, http://earthexplorer.usgs.gov, and The National Map Viewer, http://nationalmap.gov/viewer.html,

is considered to be the "best available" data from the USGS.

For questions on distribution, please refer to the Distribution Section, Contact Information.

For processing, please see Data Quality Section, Processing Step, Contact Information.

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > TOPOGRAPHICAL RELIEF MAPS
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION
ISO 19115 Topic Category
elevation
UNCONTROLLED
3D Elevation Program 3D Elevation Program
3D Elevation Program 3DEP
3D Elevation Program 3DEP-Coastal Zone
3D Elevation Program 3DEP-CZ
3D Elevation Program Acoustic Sonar
3D Elevation Program Bathymetric
3D Elevation Program Bathymetry
3D Elevation Program CMGP
3D Elevation Program Coastal Marine and Geology Program
3D Elevation Program Coastal Zone
3D Elevation Program DEM
3D Elevation Program Digital Elevation Model
3D Elevation Program Digital Terrain Model
3D Elevation Program DTM
3D Elevation Program Elevation
3D Elevation Program Hydrologic
3D Elevation Program Hydrologic Modeling
3D Elevation Program LiDAR
3D Elevation Program Light Detection and Ranging
3D Elevation Program Surface Model
3D Elevation Program Topobathy
3D Elevation Program Topobathymetric
3D Elevation Program U.S. Geological Survey
3D Elevation Program USGS
American Society of Photogrammetry and Remote Sensing National Standards for Spatial Digital Accuracy

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALABAMA
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > LOUISIANA
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MISSISSIPPI
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > TEXAS
UNCONTROLLED
Geographic Names Information System Abbeville
Geographic Names Information System Baker
Geographic Names Information System Baton Rouge
Geographic Names Information System Bayou Cane
Geographic Names Information System Biloxi
Geographic Names Information System Bogalusa
Geographic Names Information System Chalmette
Geographic Names Information System County of Acadia
Geographic Names Information System County of Allen
Geographic Names Information System County of Ascension
Geographic Names Information System County of Assumption
Geographic Names Information System County of Avoyelles
Geographic Names Information System County of Baldwin
Geographic Names Information System County of Beauregard
Geographic Names Information System County of Calcasieu
Geographic Names Information System County of Cameron
Geographic Names Information System County of Concordia
Geographic Names Information System County of East Baton Rouge
Geographic Names Information System County of East Feliciana
Geographic Names Information System County of Evangeline
Geographic Names Information System County of George
Geographic Names Information System County of Hancock
Geographic Names Information System County of Harrison
Geographic Names Information System County of Iberia
Geographic Names Information System County of Iberville
Geographic Names Information System County of Jackson
Geographic Names Information System County of Jasper
Geographic Names Information System County of Jefferson
Geographic Names Information System County of Jefferson Davis
Geographic Names Information System County of Lafayette
Geographic Names Information System County of LaFourche
Geographic Names Information System County of Livingston
Geographic Names Information System County of Mobile
Geographic Names Information System County of Newton
Geographic Names Information System County of Orange
Geographic Names Information System County of Orleans
Geographic Names Information System County of Pearl River
Geographic Names Information System County of Plaquemines
Geographic Names Information System County of Pointe Coupee
Geographic Names Information System County of Rapides
Geographic Names Information System County of St. Bernard
Geographic Names Information System County of St. Charles
Geographic Names Information System County of St. Helena
Geographic Names Information System County of St. James
Geographic Names Information System County of St. John The Baptist
Geographic Names Information System County of St. Landry
Geographic Names Information System County of St. Martin
Geographic Names Information System County of St. Mary
Geographic Names Information System County of St. Tammany
Geographic Names Information System County of Stone
Geographic Names Information System County of Tangipahoa
Geographic Names Information System County of Terrebonne
Geographic Names Information System County of Vermilion
Geographic Names Information System County of Vernon
Geographic Names Information System County of Washington
Geographic Names Information System County of West Baton Rouge
Geographic Names Information System County of West Feliciana
Geographic Names Information System Crowley
Geographic Names Information System Daphne
Geographic Names Information System Estelle
Geographic Names Information System Eunice
Geographic Names Information System Gautier
Geographic Names Information System Gretna
Geographic Names Information System Groves
Geographic Names Information System Gulfport
Geographic Names Information System Hammond
Geographic Names Information System Harvey
Geographic Names Information System Houma
Geographic Names Information System Jefferson
Geographic Names Information System Jennings
Geographic Names Information System Kenner
Geographic Names Information System Lafayette
Geographic Names Information System Lake Charles
Geographic Names Information System Laplace
Geographic Names Information System Long Beach
Geographic Names Information System Marrero
Geographic Names Information System Merrydale
Geographic Names Information System Metairie
Geographic Names Information System Mobile
Geographic Names Information System Morgan City
Geographic Names Information System Moss Point
Geographic Names Information System Nederland
Geographic Names Information System New Iberia
Geographic Names Information System New Orleans
Geographic Names Information System Ocean Springs
Geographic Names Information System Opelousas
Geographic Names Information System Orange
Geographic Names Information System Orange Grove
Geographic Names Information System Pascagoula
Geographic Names Information System Picayune
Geographic Names Information System Port Arthur
Geographic Names Information System Port Neches
Geographic Names Information System Prichard
Geographic Names Information System River Ridge
Geographic Names Information System Saraland
Geographic Names Information System Shenandoah
Geographic Names Information System Slidell
Geographic Names Information System State of Alabama
Geographic Names Information System State of Mississippi
Geographic Names Information System State of New Orleans
Geographic Names Information System State of Texas
Geographic Names Information System Sulphur
Geographic Names Information System Terrytown
Geographic Names Information System Thibodaux
Geographic Names Information System Tillmans Corner
Geographic Names Information System Timberlane
Geographic Names Information System Vidor
Geographic Names Information System Westwego
U.S. Department of Commerce AL
U.S. Department of Commerce LA
U.S. Department of Commerce MS
U.S. Department of Commerce TX
U.S. Department of Commerce U.S.
U.S. Department of Commerce United States
U.S. Department of Commerce US
U.S. Department of Commerce USA

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Data Presentation Form: Map (digital)
Entity Attribute Overview:

This collection of high-resolution coastal elevation data is available in a user-friendly Georeferenced Tagged Image File Format (GeoTIFF).

The elevation model has floating point numeric values. Areas where data is incomplete due to lack of full image coverage or NoData are represented

with the numeric value of -3.40282346639e+038.

Spatially referenced metadata are contained within an ESRI vector shapefile that contains footprints with accompanying attribute fields for each of the

source input areas.

Entity Attribute Detail Citation:

None

Distribution Liability:

Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is

made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty. Data may

have been compiled from various outside sources. Spatial information may not meet National Map Accuracy Standards. This information may

be updated without notification. The USGS shall not be liable for any activity involving these data, installation, fitness of the data for a particular

purpose, its use, or analyses results.

Data Set Credit: Please refer to the Data Quality Section, Source Citations for original source data information.

Support Roles

Data Steward

CC ID: 664122
Date Effective From: 2014
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Distributor

CC ID: 664124
Date Effective From: 2014
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 664125
Date Effective From: 2014
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 664123
Date Effective From: 2014
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 664128
W° Bound: -75.149816
E° Bound: -74.383026
N° Bound: 40.192277
S° Bound: 39.53345

Extent Group 1 / Time Frame 1

CC ID: 664127
Time Frame Type: Range
Start: 1888
End: 2013

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Grid Representation 1

CC ID: 664112
Dimension Count: 3
Cell Geometry: Point
Transformation Parameters Available?: No

Axis Dimension 1

Dimension Type: Row
Size: 88848

Axis Dimension 2

Dimension Type: Column
Size: 286892

Axis Dimension 3

Dimension Type: Vertical
Size: 1

Access Information

Security Class: Unclassified
Security Classification System:

None

Security Handling Description:

None

Data Access Constraints:

Any acquisition or use of these data signifies a user's agreement to comprehension and compliance of the USGS Standard Disclaimer.

Ensure all portions of metadata are read and clearly understood before using these data in order to protect both user and USGS interests.

Data Use Constraints:

There is no guarantee or warranty concerning the accuracy of the data. Users should be aware that temporal changes may have

occurred since these data were collected and that some parts of these data may no longer represent actual surface conditions. Users should not use

these data for critical applications without a full awareness of its limitations. These data should not be used for navigation purposes.

Acknowledgement of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data is obligated

to describe the types of modifications they perform. User specifically agrees not to misrepresent the data, nor to imply that changes made were

approved or endorsed by the USGS. Please refer to http://www.usgs.gov/privacy.html for the USGS disclaimer.

Distribution Information

Distribution 1

CC ID: 721043
Download URL: https://coast.noaa.gov/dataviewer/#/imagery/search/where:ID=4958
Distributor:
File Name: Customized Download
Description:

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

Distribution 2

CC ID: 721044
Download URL: https://coast.noaa.gov/htdata/raster2/elevation/Louisiana_Coned_Topobathy_DEM_2014_4958
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 721046
URL: http://earthexplorer.usgs.gov
URL Type:
Online Resource

URL 2

CC ID: 721047
URL: http://nationalmap.gov/viewer.html
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 664281
Activity Date/Time: 2017-02-22
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 664280
Activity Date/Time: 2017-11-14
Description:

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

Activity Log 3

CC ID: 718634
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 721045
Activity Date/Time: 2018-02-13
Description:

Partial upload to move data access links to Distribution Info.

Technical Environment

Description:

Microsoft Windows 7 Enterprise, Service Pack 1, ESRI ArcGIS v.10.2

Data Quality

Horizontal Positional Accuracy:

N/A

Vertical Positional Accuracy:

The vertical accuracy of the input topographic data varies depending on the input source. Because the input elevation data were

derived primarily from LiDAR, the vertical accuracy ranges from 6 to 23.5 centimeters in root mean square error (RMSE).

Completeness Measure:

Cloud Cover: 0

Completeness Report:

Visual inspection

Conceptual Consistency:

Visual inspection

Lineage

Sources

EAARL coastal topography-Chandeleur Islands, Louisiana, 2010

CC ID: 664106
Contact Name: USGS
Publish Date: 2010-01-01
Extent Type: Discrete
Extent Start Date/Time: 2010
Source Contribution:

Nayegandhi, Amar, Bonisteel-Cormier, J.M., Brock, J.C., Sallenger, A.H., Wright, C.W., Nagle, D.B.,

Vivekanandan, Saisudha, Yates, Xan, and Klipp, E.S., 2010, EAARL coastal topography-Chandeleur Islands, Louisiana, 2010:

bare earth: U.S. Geological Survey Data Series 511, 1 DVD. | Source Geospatial Form: document | Type of Source Media: DVD

Joint Airborne LiDAR Bathymetry (2009) and Post-Hurricane Katrina Levee Surveys (2005)

CC ID: 664105
Contact Name: United States Army Corps of Engineers (USACE), The Joint Airborne LiDAR Bathymetry Technical Center of Expertise (JABLTCX)
Publish Date: 2009-01-01
Extent Type: Range
Extent Start Date/Time: 2005
Extent End Date/Time: 2009
Citation URL: https://coast.noaa.gov/
Source Contribution:

Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce. 2009. 2005

United States Army Corps of Engineers (USACE), The Joint Airborne LiDAR Bathymetry Technical Center of Expertise (JABLTCX), 2009 Coastal Survey 2009.,

dataset accessed at December 17, 2014 at https://coast.noaa.gov/

Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce. 2005. 2005 United States

Army Corps of Engineers (USACE) Post-Hurricane Katrina Levee Surveys, 13 - 18 September 2005., dataset accessed at December 17, 2014 at

https://coast.noaa.gov/. | Source Geospatial Form: raster digital data | Type of Source Media: Download

LiDAR Data Collection

CC ID: 664104
Contact Name: U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC)
Publish Date: 2014-01-01
Extent Type: Range
Extent Start Date/Time: 2010
Extent End Date/Time: 2014
Citation URL: http://earthexplorer.usgs.gov
Source Contribution:

2010. Atchafalaya LiDAR Data Collection Project (Classified and Unclassified LAS files and Tiled DEMs), Task Order G10PD02495, V1.0, 15

December 2009 to 15 March 2010. U.S. Geological Survey National Geospatial Technical Operations Center, dataset accessed December-17, 2014

at http://earthexplorer.usgs.gov.

2011. ARRA-LA_COASTAL LiDAR Data Collection Project (Classified and Unclassified LAS files and Tiled DEMs), Task Order G10PD02781, V1.0,

V1.0, 15 January 2011 to 15 March 2011. U.S. Geological Survey National Geospatial Technical Operations Center, dataset accessed December 17, 2014

at http://earthexplorer.usgs.gov.

2013. Atchafalaya2 LiDAR Data Collection Project (Classified and Unclassified LAS files and Tiled DEMs), Task Order G12PD00075, V3.0, V1.0, 15

December 2012 to 15 March 2013. U.S. Geological Survey National Geospatial Technical Operations Center, dataset accessed December 17, 2014

at http://earthexplorer.usgs.gov.

2014. Jean Lafitte & Barataria LiDAR Data Collection Project (Classified and Unclassified LAS files and Tiled DEMs), Task Order G13PD00214, V1.0, 5

March to 8 March 2013. U.S. Geological Survey National Geospatial Technical Operations Center, dataset accessed December 17, 2014

at http://earthexplorer.usgs.gov. | Source Geospatial Form: raster digital data | Type of Source Media: Download

Process Steps

Process Step 1

CC ID: 664107
Description:

The principal methodology for developing the integrated topobathymetric elevation model can be organized into three

main components. The "topography component" consists of the land-based elevation data, which is primarily comprised from

high-resolution LiDAR data. The topographic source data will include LiDAR data from different sensors (Topographic, Bathymetric)

with distinct spectral wavelengths (NIR-1064nm, Green-532nm).

The "bathymetry component" consists of hydrographic sounding (acoustic) data collected using boats rather than bathymetry acquired

from LiDAR. The most common forms of bathymetry that are used include: multi-beam, single-beam, and swath.

The final component, "Integration", encompasses the assimilation of the topographic and bathymetric data along the near-shore based

on a predefined set of priorities. The land/water interface (+1 m- -1.5 m) is the most critical area, and green laser systems, such as the

Experimental Advanced Airborne Research LiDAR (EAARL-B) and the Coastal Zone Mapping and Imaging LiDAR (CZMIL) that

cross the near-shore interface are valuable in developing a seamless transition.

The end product from the topography and bathymetry components is a raster with associated spatial masks and metadata that can be

passed to the integration component for final model incorporation.

Topo/Bathy Creation Steps:

Topography Processing Component:

a) Quality control check the vertical and horizontal datum and projection information of the input lidar source to ensure the data is referenced to NAVD88 and NAD83, UTM. If the source data is not NAVD88, transform the input LiDAR data to NAVD88 reference

frame using current National Geodetic Survey (NGS) geoid models. Likewise, if required, convert the input source data to NAD83 and reproject to UTM.

b) Check the classification of the topographic LiDAR data to verify the data are classified with the appropriate classes.

If the data have not been classified, then classify the raw point cloud data to non-ground (class 1) ground (class 2), and water (class 9)

classes using LP360-Classify.

c) Derive associated breaklines from the classified LiDAR to capture internal water bodies, such as lakes and ponds and inland

waterways. Inland waterways and water bodies will be hydro-flattened where no bathymetry is present.

d) Extract the ground returns from the classified LiDAR data and randomly spatial subset the points into two point sets based

on the criteria of 95 percent of the points for the "Actual Selected" set and the remaining 5 percent for the "Test Control" set.

The "Actual Selected" points will be gridded in the terrain model along with associated breaklines and masks to generate the topographic

surface, while the "Test Control" points will be used to compute the interpolation accuracy (Root Mean Square Error) from the derived surface.

e) Generate the minimum convex hull boundary from the classified ground LiDAR points that creates a mask that extracts

the perimeter of the exterior LiDAR points. The mask is then applied in the terrain to remove extraneous terrain artifacts outside

of the extent of the ground LiDAR points.

f) Using a terrain model based on triangulated irregular networks (TINs), grid the "Actual Selected" ground points using

breaklines and the minimum convex hull boundary mask at a 3-meter spatial resolution using a natural neighbor interpolation algorithm.

g) Compute the interpolation accuracy by comparing elevation values in the "Test Control" points to values extracted from the

derived gridded surface; report the results in terms of Root Mean Square Error (RMSE).

Process Date/Time: 2014-02-01 00:00:00

Process Step 2

CC ID: 664108
Description:

Bathymetry Processing Component:

a) Quality control check the vertical and horizontal datum and projection information of the input bathymetric source to ensure the

data is referenced to NAVD88 and NAD83, UTM. If the source data is not NAVD88, transform the input bathymetric data to NAVD88

reference frame using VDatum. Likewise, if required, convert the input source data to NAD83 and reproject to UTM.

b) Prioritize and spatially sort the bathymetry based on date of acquisition, spatial distribution, accuracy, and point density to eliminate

any outdated or erroneous points and to minimize interpolation artifacts.

c) Randomly spatial subset the bathymetric points into two point sets based on the criteria of 95 percent of the points for the

"Actual Selected" set and the remaining 5 percent for the "Test Control" set. The "Actual Selected" points will be gridded in the

empirical bayesian krigging model along with associated masks to generate the bathymetric surface, while the "Test Control" points

will be used to compute the interpolation accuracy (Root Mean Square Error) from the derived surface.

d) Spatially interpolate bathymetric single-beam, multi-beam, and hydrographic survey source data using an empirical bayesian

krigging gridding algorithm. This approach uses a geostatistical interpolation method that accounts for the error in estimating the underlying

semivariogram (data structure - variance) through repeated simulations.

e) Cross validation - Compare the predicted value in the geostatistical model to the actual observed value to assess the accuracy and

effectiveness of model parameters by removing each data location one at a time and predicting the associated data value. The results will

be reported in terms of RMSE.

f) Compute the interpolation accuracy by comparing elevation values in the "Test Control" points to values extracted from the derived

gridded surface; report the results in terms of RMSE.

Process Date/Time: 2014-02-01 00:00:00

Process Step 3

CC ID: 664109
Description:

Mosaic Dataset Processing (Integration) Component:

a) Determined priority of input data based on project characteristics, including acquisition dates, cell size, retention of features, water

surface treatment, visual inspection and presence of artifacts.

b) Develop an ArcGIS geodatabase (Mosaic Dataset) and spatial seamlines for each individual topographic (minimum convex hull boundary)

and bathymetric raster layer included in the integrated elevation model.

c) Generalize seamline edges to smooth transition boundaries between neighboring raster layers and split complex raster datasets with

isolated regions into individual unique raster groups.

d) Develop an integrated shoreline transition zone from the best available topographic and bathymetric data to blend the topographic and

bathymetric elevation sources. Where feasible, use the minimum convex hull boundary, create a buffer to logically mask input topography/bathymetry

data. Then, through the use of TINs, interpolate the selected topographic and bathymetric points to gap-fill, if required any near-shore holes in

the bathymetric coverage. Topobathymetric LiDAR data sources such as the EAARL-B or CZMIL systems provide up-to-date, high-resolution

data along the critical land/water interface within inter-tidal zone.

e) Prioritize and spatially sort the input topographic and bathymetric raster layers based on date of acquisition and accuracy to sequence

the raster data in the integrated elevation model.

f) Based on the prioritization, spatially mosaic the input raster data sources to create a seamless topobathymetric composite at a cell size

of 3 meters using blending (spatial weighting).

g) Performed a visual quality assurance (Q/A) assessment on the output composite to review the mosaic seams for artifacts.

h) Generate spatially referenced metadata for each unique data source. The spatially reference metadata consists of a group of

geospatial polygons that represent the spatial footprint of each data source used in the generation of the topobathymetric dataset. Each

polygon is to be populated with attributes that describe the source data, such as, resolution, acquisition date, source name, source organization,

source contact, source project, source URL, and data type (topographic LiDAR, bathymetric LiDAR, multi-beam bathymetry, single-beam bathymetry, etc.).

Process Date/Time: 2014-02-01 00:00:00

Process Step 4

CC ID: 664110
Description:

Data were received from USGS by NOAA and ingested into the Digital Coast system for download via custom processing and ftp. Metadata was modified to reflect distribution through this mechanism.

Process Date/Time: 2015-09-01 00:00:00

Catalog Details

Catalog Item ID: 49466
GUID: gov.noaa.nmfs.inport:49466
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:13+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-05-30 18:09+0000
Metadata Record Published: 2018-02-13
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2018-02-13
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2019-02-13