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Short Citation:
OCM Partners, 2023: 2009 USACE NCMP Topobathy Lidar DEM: AL, TX (Post Hurricanes Ike & Gustav), https://www.fisheries.noaa.gov/inport/item/67643.

Item Identification

Title: 2009 USACE NCMP Topobathy Lidar DEM: AL, TX (Post Hurricanes Ike & Gustav)
Short Name: usace2009_gulf_dem_m9487_metadata
Status: Completed
Creation Date: 2009
Publication Date: Unknown
Abstract:

AL:

The BareEarth 1 meter Digital Elevation Model (DEM) dataset is produced from the LiDAR topographic survey conducted for the Post Hurricane Gustav Aerial Survey 2009 project. This data was produced for the US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX). The LiDAR point cloud was flown at a density sufficient to support a maximum final post spacing of 1.5 points per meter. 3001 International Inc acquired the data between April 16, 2009 and June 12, 2009. The Post Hurricane Gustav Aerial Survey 2009 was collected under the guidance of a Professional Mapper /Surveyor.

TX:

The 1 meter BareEarth Digital Elevation Model (DEM) dataset is produced from the LiDAR topographic survey conducted for the Post Hurricane Ike Aerial Survey 2009 project. This data was produced for the US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX). The LiDAR point cloud was flown at a density sufficient to support a maximum final post spacing of 1 point per meter. 3001 International Inc acquired the data between February 3, 2009 and April 23, 2009. The Post Hurricane Ike Aerial Survey 2009 was collected under the guidance of a Professional Mapper /Surveyor.

In addition to these bare earth Digital Elevation Model (DEM) data, the lidar point data that these DEM data were created from, are also available. These data are available for custom download at the link provided in the URL section of this metadata record.

Purpose:

The Post Hurricane Gustav Aerial Survey 2009 project will support the US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) collection of data representing the post-hurricane condition of the beaches, barrier islands, and lakeshores along the coasts of Louisiana, Mississippi, and Alabama following Hurricane Gustav.

The Post Hurricane Ike Aerial Survey 2009 project will support the US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) collection of data representing the post-hurricane condition of the beaches, barrier islands, and lakeshores along the coasts of Texas and Louisiana following Hurricanes Ike and Gustav.

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > DIGITAL ELEVATION/TERRAIN MODEL (DEM)
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY > COASTAL BATHYMETRY
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION
ISO 19115 Topic Category
elevation

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
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 > TEXAS
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > LAND SURFACE
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > SEA FLOOR

Instrument Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Instrument Keywords
LIDAR > Light Detection and Ranging

Platform Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Platform Keywords
AIRCRAFT

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Elevation
Maintenance Frequency: None Planned
Data Presentation Form: Model (digital)
Distribution Liability:

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

Data Set Credit: US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX), 3001 International Inc

Support Roles

Data Steward

CC ID: 1180234
Date Effective From: 2022
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: 1180233
Date Effective From: 2022
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: 1180235
Date Effective From: 2022
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: 1180236
Date Effective From: 2022
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: 1180239
W° Bound: -97.403424
E° Bound: -88.114424
N° Bound: 30.414925
S° Bound: 25.951525

Extent Group 1 / Time Frame 1

CC ID: 1180262
Time Frame Type: Range
Start: 2009-02-03
End: 2009-08-17
Description:

Dates of collection for Texas.

Extent Group 1 / Time Frame 2

CC ID: 1180238
Time Frame Type: Range
Start: 2009-04-16
End: 2009-06-12
Description:

Dates of collection for Alabama.

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Reference Systems

Reference System 1

CC ID: 1180264

Coordinate Reference System

CRS Type: Geographic 2D
EPSG Code: EPSG:4269
EPSG Name: NAD83
See Full Coordinate Reference System Information

Reference System 2

CC ID: 1180265

Coordinate Reference System

CRS Type: Vertical
EPSG Code: EPSG:5703
EPSG Name: NAVD88 height
See Full Coordinate Reference System Information

Access Information

Security Class: Unclassified
Data Access Procedure:

Data is available online for bulk or custom downloads

Data Access Constraints:

None

Data Use Constraints:

Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this 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: 1180241
Start Date: 2022-08-10
End Date: Present
Download URL: https://chs.coast.noaa.gov/htdata/raster5/elevation/USACE_Gulf_DEM_2009_9487
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2022 - Present)
File Name: Bulk Download
Description:

Bulk download of data files in the original coordinate system.

File Type: GeoTIFF

Distribution 2

CC ID: 1180240
Start Date: 2022-08-10
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=9487/details/9487
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2022 - Present)
File Name: Customized Download
Description:

Create custom data files by choosing data area, map projection, file format, etc. A new metadata will be produced to reflect your request using this record as a base.

File Type: Zip
Compression: Zip

URLs

URL 1

CC ID: 1180230
URL: https://coast.noaa.gov/
Name: NOAA's Office for Coastal Management (OCM) website
URL Type:
Online Resource
File Resource Format: HTML
Description:

Information on the NOAA Office for Coastal Management (OCM)

URL 2

CC ID: 1180231
URL: https://coast.noaa.gov/dataviewer/
Name: NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV)
URL Type:
Online Resource
File Resource Format: HTML
Description:

The Data Access Viewer (DAV) allows a user to search for and download elevation, imagery, and land cover data for the coastal U.S. and its territories. The data, hosted by the NOAA Office for Coastal Management, can be customized and requested for free download through a checkout interface. An email provides a link to the customized data, while the original data set is available through a link within the viewer.

URL 3

CC ID: 1180266
URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1061/details/1061
Name: Custom Point Download
URL Type:
Online Resource
File Resource Format: Zip
Description:

Link to custom download, from the Data Access Viewer (DAV), the lidar point data from which these raster Digital Elevation Model (DEM) data were created. The coverage area differs between the point data and the DEM data. The point data also covers the Louisiana and Mississippi coastline and is missing some of the southern Texas coastline.

URL 4

CC ID: 1180267
URL: https://coast.noaa.gov/htdata/raster5/elevation/USACE_Gulf_DEM_2009_9487/supplemental/usace2009_gulf_dem_m9487.kmz
Name: Browse Graphic
URL Type:
Online Resource
File Resource Format: KML
Description:

This graphic displays the footprint for this DEM data set.

Technical Environment

Description:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.6.1500

Data Quality

Horizontal Positional Accuracy:

All ground control processing and adjustment is performed using published coordinate horizontal and vertical datums (e.g. NGS CORS). For deliverables, Corpscon for Windows Version 5.11.08 (geoid 03) was used for horizontal and vertical datum conversion as well as for coordinate system conversion purposes (e.g. UTM to State Plane).

Qualitative value: 1 m -See entity and attribute information

Vertical Positional Accuracy:

The accuracy assessment was performed using a standard method to compute the root mean square error (RMSE) based on a comparison of ground control points (GCP) and filtered LiDAR data points. Filtered LiDAR data has had vegetation and cultural features removed and by analysis represents bare-earth elevations. The RMSE figure was used to compute the vertical National Standard for Spatial Data Accuracy (NSSDA). Ground control was established by 3001, Inc. A spatial proximity analysis was used to select edited LiDAR data points contiguous to the relevant GCPs. A search radius decision rule is applied with consideration of terrain complexity, cumulative error and adequate sample size. Cumulative error results from the errors inherent in the various sources of horizontal measurement. These sources include the airborne GPS, GCPs and the uncertainty of the accuracy of the LiDAR data points. This accuracy is achieved prior to the sub-sampling that occurs through integration with the inertial measurement unit (IMU) positions that are recorded. It is unclear at this time whether the initial accuracy is maintained. The horizontal accuracy of the GCPs is estimated to be in the range of approximately 1 to 1.6 inches. Finally, sample size was considered. The specification for the National Standard for Spatial Data Accuracy is a minimum of 20 points to conduct a statistically significant accuracy evaluation (Minnesota Planning, 1999, Positional Accuracy Handbook, Minnesota Planning Land Management Information Center, St. Paul, Minnesota., p.3). Most statistical texts indicate that a minimum of 30 sample points provide a reasonable Approximation of a normal distribution. The intent of the NSSDA is to reflect the geographic area of interest and the distribution of error in the data set (Federal Geographic Data Committee, 1998, Geospatial National Standard for Spatial Data Accuracy, Federal Geographic Data Committee Secretariat, Reston, Virginia, p.3-4).

Additional steps were taken to ensure the vertical accuracy of the LiDAR data including:

Step 1: Precision Bore sighting (Check Edge-matching)

Step 2: Compare the LiDAR data to the Field Survey (Field survey is to FEMA specifications and more stringent internal specifications)

Step 3: Automated Filtering

Step 4: Manual Editing (Quality Control) Step

Qualitative value: 15 cm - See entity and attribute information

Completeness Report:

For the TX data, the Post Hurricane Ike Aerial Survey 2009 project was collected under the guidance of a Professional Mapper Surveyor. The data was collected at a density sufficient to support a maximum final post spacing of of 1.5 points per meter.

For the AL data, the Post Hurricane Gustav Aerial Survey 2009 project was collected under the guidance of a Professional Mapper Surveyor. The data was collected at a density sufficient to support a maximum final post spacing of of 1.5 points per meter.

Conceptual Consistency:

The 1 meter BareEarth Digital Elevation Model (DEM) dataset is produced from the LiDAR topographic survey conducted for the Post Hurricane Ike Aerial Survey Project. This data was produced for US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX).

Lineage

Lineage Statement:

The USACE collected, processed, and provided the data to the NOAA Office for Coastal Management (OCM). OCM received the data and processed it to be available for custom download from the Data Access Viewer (DAV) and for bulk download from https.

Sources

Post Hurricane Gustav Aerial Survey LAS Dataset

CC ID: 1180268
Contact Role Type: Originator
Contact Type: Organization
Contact Name: 3001 International, Inc.
Extent Type: Range
Extent Start Date/Time: 2009-04-16
Extent End Date/Time: 2009-06-12
Source Contribution:

The Post Hurricane Gustav Aerial Survey 2009 was acquired for US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) and processed by 3001 International Inc.

Post Hurricane Ike Aerial Survey LAS Dataset

CC ID: 1180224
Contact Role Type: Originator
Contact Type: Organization
Contact Name: 3001 International Inc
Extent Type: Range
Extent Start Date/Time: 2009-02-03
Extent End Date/Time: 2009-04-23
Scale Denominator: 24000
Source Contribution:

The Post Hurricane Ike Aerial Survey 2009 was acquired for US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) and processed by 3001 International Inc.

USACE JALBTCX

CC ID: 1180269
Contact Role Type: Originator
Contact Type: Organization
Contact Name: USACE JALBTCX

Process Steps

Process Step 1

CC ID: 1180225
Description:

The Airborne Global Position System (ABGPS), inertial measurement unit (IMU), and raw scans are collected during the LiDAR aerial survey. The ABGPS monitors the xyz position of the sensor and the IMU monitors the orientation of the aircraft. During the aerial survey laser pulses reflected from features on the surface and are detected by the receiver optics and collected by the data logger. GPS locations are based on data collected by receivers on the aircraft and base stations on the ground. The ground base stations are placed no more than 20 km radius from the flight survey area.

Process Date/Time: 2009-04-23 00:00:00

Process Step 2

CC ID: 1180226
Description:

The ABGPS, IMU, and raw scans are integrated using proprietary software developed by Optech and delivered with the Optech ALTM Gemini System. The resultant file is in a LAS binary file format. The LAS file version 1.1 format can be easily transferred from one file format to another. It is a binary file format that maintains information specific to the LiDAR data (return#, intensity value, xyz, etc.). The resultant points are referenced to the Geographic NAD83 horizontal datum and NAVD88 vertical datum.

Process Date/Time: 2009-05-27 00:00:00

Process Step 3

CC ID: 1180227
Description:

The data is subjected to rigorous QA/QC according to the 3001 Inc. Quality Control Plan and procedures. Very briefly, a series of quantitative and visual procedures are employed to validate the accuracy and consistency of the data. Ground control is established by 3001, Inc. and GPS-derived ground control points (GCPs) points in various areas of dominant and prescribed land cover. These points are coded according to landcover, surface material and ground control suitability. A suitable number of points are selected for calculation of a statistically significant accuracy assessment as per the requirements of the National Standard for Spatial Data Accuracy. A spatial proximity analysis is used to select edited LiDAR data points within a specified distance of the relevant GCPs. A search radius decision rule is applied with consideration of terrain complexity, cumulative error and adequate sample size. Accuracy validation and evaluation is accomplished using proprietary software to apply relevant statistical routines for calculation of Root Mean Square Error (RMSE) and the National Standard for Spatial Data Accuracy (NSSDA) according to Federal Geographic Data Committee (FGDC) specifications.

Process Date/Time: 2009-05-27 00:00:00

Process Step 4

CC ID: 1180228
Description:

The 1 meter BareEarth DEM was extracted from ASPRS Classified LIDAR products using class 2 and attributed with the elevation for each cell of the DEM.

Process Date/Time: 2009-05-27 00:00:00

Process Step 5

CC ID: 1180270
Description:

The NOAA Office for Coastal Management (OCM) received GeoTiff format files from USACE JALBTCX in April 2022 for the Texas, Louisiana, Mississippi, and Alabama coastline project area. Upon inspection of a few random files, it was noted that the files for Louisiana and Mississippi were in ellipsoid elevations, not NAVD88. This was reported to USACE JALBTCX who confirmed that their copy of the data also had this issue. For this reason, the Louisiana and Mississippi files were not included in the OCM processing of the data. This data set only includes the Texas and Alabama files.

The bare earth raster files were at a 1 m grid spacing. The data were in geographic NAD83 coordinates and NAVD88 (Geoid03) elevations in meters. OCM assigned the appropriate EPSG codes (Horiz - 4269, Vert - 5703) and copied the raster files to https for Digital Coast storage and provisioning purposes.

Process Date/Time: 2022-08-09 00:00:00
Process Contact: Office for Coastal Management (OCM)

Related Items

Item Type Relationship Type Title
Data Set (DS) Cross Reference 2009 USACE NCMP Topobathy Lidar: AL, LA, MS, TX (Post Hurricanes Gustav & Ike)

Catalog Details

Catalog Item ID: 67643
GUID: gov.noaa.nmfs.inport:67643
Metadata Record Created By: Rebecca Mataosky
Metadata Record Created: 2022-08-10 13:33+0000
Metadata Record Last Modified By: Rebecca Mataosky
Metadata Record Last Modified: 2022-10-05 13:44+0000
Metadata Record Published: 2022-08-10
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-08-10
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-08-10