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Short Citation:
OCM Partners, 2022: 2009 USACE NCMP Topobathy Lidar: AL, LA, MS, TX (Post Hurricanes Gustav & Ike), https://www.fisheries.noaa.gov/inport/item/50081.

Item Identification

Title: 2009 USACE NCMP Topobathy Lidar: AL, LA, MS, TX (Post Hurricanes Gustav & Ike)
Short Name: usace2009_postgustav_postike_m1061_metadata
Status: Completed
Publication Date: 2011-09
Abstract:

The Light Detection and Ranging (LiDAR) LAS dataset is a topographic survey conducted for the Post Hurricane Gustav and Post Hurricane Ike Aerial Survey 2009 projects. Hurricane Gustav made US landfall at Cocodrie, LA on September 1, 2008. Hurricane Ike made US landfall near Galveston, TX on September 13, 2008. 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. The data are classified according to ASPRS LAS specifications as: 1 (Unclassified), 2 (Ground), 3 (Low Vegetation) 4 (Medium Vegetation), 5 (High Vegetation), 6 (Building), 7 (Low Point (Noise)), and 9 (Water). 3001 International Inc. acquired the 290 flightlines between February 3, 2009 and April 23, 2009. The Post Hurricane Gustav and Post Hurricane Ike Aerial

Surveys 2009 were collected under the guidance of a Professional Mapper/Surveyor.

Original contact information:

Contact Org: 3001 International Inc.

Title: LiDAR Department

Phone: (985) 661 - 3001

Email: lidar@3001inc.com

In addition to the lidar point data, topobathy bare earth Digital Elevation Models (DEMs) at a 1 meter grid spacing, created from the lidar point data are also available from the NOAA Digital Coast. The link to this data is provided in the URL section of this metadata record.

Purpose:

The Post Hurricane Gustav and Post Hurricane Ike Aerial Survey 2009 projects 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 Alabama, Louisiana, Mississippi, and Texas following Hurricanes Gustav and Ike.

Notes:

10725

Supplemental Information:

A footprint of this data set may be viewed in Google Earth at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1061/supplemental/2009_USACE_Post_Hurricanes_Gustav_and_Ike_Topo_Lidar.kmz

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None Height

Temporal Keywords

Thesaurus Keyword
UNCONTROLLED
None 2008
None September

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 the analysis of this information are not the responsibility of USACE, JALBTCX, the Office for Coastal Management or its partners.

Data Set Credit: Acknowledgement of US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) would be appreciated in products derived from these data.

Support Roles

Data Steward

CC ID: 689621
Date Effective From: 2011-09
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: 689623
Date Effective From: 2011-09
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: 689624
Date Effective From: 2011-09
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: 689622
Date Effective From: 2011-09
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: 1132286
W° Bound: -96.377283
E° Bound: -88.021722
N° Bound: 30.524092
S° Bound: 28.396541

Extent Group 1 / Time Frame 1

CC ID: 1132285
Time Frame Type: Range
Start: 2009-02-03
End: 2009-04-23

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Reference Systems

Reference System 1

CC ID: 1180272

Coordinate Reference System

CRS Type: Geographic 3D
EPSG Code: EPSG:6319
EPSG Name: NAD83(2011)
See Full Coordinate Reference System Information

Access Information

Security Class: Unclassified
Security Classification System:

Unclassified

Security Handling Description:

Unclassified

Data Access Procedure:

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer;

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: 742931
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1061
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2011-09 - Present)
File Name: Customized Download
Description:

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

File Type: Zip

Distribution 2

CC ID: 742932
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1061/index.html
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2011-09 - Present)
File Name: Bulk Download
Description:

Simple download of data files.

File Type: LAZ

URLs

URL 1

CC ID: 742934
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 742935
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 1180271
URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=9487/details/9487
Name: Custom DEM Download
URL Type:
Online Resource
File Resource Format: Zip
Description:

Link to custom download, from the Data Access Viewer (DAV), the raster Digital Elevation Model (DEM) data that were created from this lidar data set. The coverage area differs between the point data and the DEM data. The DEM data does not cover the Louisiana and Mississippi coastline and includes some additional southern Texas coastline.

Activity Log

Activity Log 1

CC ID: 689642
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 689641
Activity Date/Time: 2017-11-14
Description:

Converted from FGDC Content Standard 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: 718685
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 742933
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Technical Environment

Description:

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

Data Quality

Accuracy:

The Post Hurricane Gustav and Post Hurricane Ike Aerial Survey 2009 projects were collected under the guidance of a Professional Mapper/Surveyor.

The data were collected at a density sufficient to support a maximum final post spacing of 1.5 points per meter.

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).

; Quantitative Value: 1 meters, Test that produced the value: 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

; Quantitative Value: 0.15 meters, Test that produced the value: See entity and attribute information

Completeness Measure:

Cloud Cover: 0

Completeness Report:

The LAS files were flown at a density sufficient to support a maximum final post spacing of final post spacing of 1.5 points per meter.

Conceptual Consistency:

The Light Detection and Ranging (LiDAR) LAS dataset is a topographic survey conducted for the Post Hurricane Gustav and Post Hurricane Ike Aerial

Survey Projects. These data were produced for the US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of

Expertise (JALBTCX).

Lineage

Sources

Post Hurricane Gustav and Post Hurricane Ike Aerial Surveys LAS Datasets

CC ID: 1132278
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 Gustav and Post Hurricane Ike Aerial Surveys 2009 were acquired for the US Army Corps of Engineers (USACE) Joint Airborne

Lidar Bathymetry Technical Center of Expertise (JALBTCX) and processed by 3001 International Inc.

| Source Geospatial Form: raster digital data | Type of Source Media: digital tape media

Process Steps

Process Step 1

CC ID: 1132279
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. The instruments used to collect this data were the Optech ALTM Gemini and the Airborne Global Positioning System.

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

Process Step 2

CC ID: 1132280
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: 1132281
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: 1132282
Description:

The NOAA Office for Coastal Management (OCM) received classified data (ASPRS LAS classifications include: 1 (unclassified), 2 (ground),

3 (Low Vegetation), 4 (Medium Vegetation), 5 (High Vegetation), 6 (Building), 7 (Low Point, (Noise)), and 9 (water)) in las format.

The files contained LiDAR intensity and elevation measurements. OCM performed the following processing on the data for data storage and Digital

Coast provisioning purposes:

1. The data were converted from NAVD88 heights to ellipsoid heights using Geoid03.

2. The LAS header fields were sorted by latitude and updated.

Process Date/Time: 2011-08-01 00:00:00
Process Contact: Office for Coastal Management (OCM)

Process Step 5

CC ID: 1132283
Description:

Time stamps for each point in the files were converted from GPS seconds of the week to adjusted GPS seconds. The dates in the file names were used to determine the correct GPS week for the conversion and software program las2las was used to make the changes.

Process Date/Time: 2014-05-28 00:00:00
Process Contact: Office for Coastal Management (OCM)

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity LAS V.1.1 LiDAR Data

Related Items

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

Catalog Details

Catalog Item ID: 50081
GUID: gov.noaa.nmfs.inport:50081
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:24+0000
Metadata Record Last Modified By: Rebecca Mataosky
Metadata Record Last Modified: 2022-08-10 15:00+0000
Metadata Record Published: 2022-03-16
Owner Org: OCMP
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