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Short Citation:
OCM Partners, 2022: 2009-2010 USACE Vicksburg District Lidar: Mississippi Phase II, https://www.fisheries.noaa.gov/inport/item/49818.

Item Identification

Title: 2009-2010 USACE Vicksburg District Lidar: Mississippi Phase II
Short Name: ms20092010_usace_phaseII_m2600_metadata
Status: Completed
Publication Date: 2013-12-20
Abstract:

Phase two will consist of post processing of the data collected. Aeroquest Optimal, Inc. shall

process the digital elevation data from a precision airborne (LIDAR) survey within the entire

project area. The proposed project area is approximately 6.3 million acres. The purpose of the

survey is to obtain measurements of the bare ground surface, as well as top surface feature

elevation data for providing geometry input to USACE hydraulic modeling program.

This project for USACE, Vicksburg District was to provide digital orthophotography using DMC imagery

for approximately 4,120 square miles located in NW Mississippi at a 2-foot pixel resolution.

Original contact information:

Contact Name: Elijah C. Hunt

Contact Org: U.S. Army Corps of Engineers, Vicksburg District

Phone: (601) 631-7040

Email: elijah.c.hunt@us.army.mil

Purpose:

The purpose of this survey is to provide the Vicksburg District with bare earth and

top surface elevation data for providing geometry input to USACE hydraulic modeling

programs.

Notes:

10462

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/geoid18/2600/supplemental/ms2009_2010_usace_phaseII.KMZ

Reports explaining collection and quality assurance is available at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2600/supplemental/ms2009_2010_usace_phaseII.pdf

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None LAZ

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: las
Entity Attribute Overview:

LiDAR points in LAZ format (ASPRS Classes 1,2)

Entity Attribute Detail Citation:

none

Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility

of Aeroquest Optimal, Inc., MDEQ, USACE, NOAA, the Office for Coastal Management or its partners.

Support Roles

Data Steward

CC ID: 678590
Date Effective From: 2013-12-20
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: 678592
Date Effective From: 2013-12-20
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: 678593
Date Effective From: 2013-12-20
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: 678591
Date Effective From: 2013-12-20
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: 1134941
W° Bound: -90.0886487
E° Bound: -88.8334027
N° Bound: 34.981004
S° Bound: 33.6759277

Extent Group 1 / Time Frame 1

CC ID: 1134940
Time Frame Type: Range
Start: 2009-12-17
End: 2010-07-09

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:

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2600

;

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. These data depict the heights at the time of the survey and are only accurate for that time.

Distribution Information

Distribution 1

CC ID: 741514
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2600
Distributor:
File Name: Customized Download
Description:

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

Distribution 2

CC ID: 741515
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2600/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 741517
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 741518
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 741519
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2600/supplemental/ms2009_2010_usace_phaseII.KMZ
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar coverage for the 2009-2010 Phase II collection area

in Mississippi.

Activity Log

Activity Log 1

CC ID: 678621
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 678620
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: 718389
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 741516
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Accuracy:

Elevations are recorded in floating-point meters and the vertical datum is ellipsoidal (GEOID03).

Horizontal Positional Accuracy:

Expected accuracies are not tested accuracies.

OPTECH ALTM 3100 LiDAR Sensor - Expected horizontal accuracy of elevation products

as determined from system studies and other methods is 1/2,000th of the flight

height, which, in the instance of this particular project, was 3,280 U.S.

survey feet (1,000 meters) AGL, giving a horizontal tolerance of less than 1.640

U.S. survey feet (0.500 meters).

OPTECH ALTM 3100EA LiDAR Sensor - Expected horizontal accuracy of elevation products

as determined from system studies and other methods is 1/5,500th of the flight height

which, in the instance of this particular project, was 3,280 U.S. survey feet

(1,000 meters) AGL, giving a horizontal tolerance of less than 0.596 U.S. survey

feet (0.182 meters).

OPTECH ALTM Gemini LiDAR Sensor - Expected horizontal accuracy of elevation products

as determined from system studies and other methods is 1/11,000th of the flight

height, which, in the instance of this particular project, was 5,905 U.S. survey feet

(1,800 meters) AGL, giving a horizontal tolerance of less than 0.537 U.S. survey feet

(0.164 meters).

Horizontal positional accuracy for LiDAR is dependent upon the quality of the GPS/INS

solution, sensor calibration and ground conditions at the time of data capture.

The standard system results for horizontal accuracy are less than 1 meter.

Not tested therefore horizontal accuracy is assumed as 1.0 m.

; Quantitative Value: 1.0 meters, Test that produced the value: See LiDAR data report.

Vertical Positional Accuracy:

The LiDAR data was tested against control points established using RTK GPS

techniques. Six-hundred and seventy-nine (679) test points were collected throughout

the project area in several vegetation categories. The RMSE calculations were

performed on the bare-earth, orthometric surface and determined for each of the four

LiDAR acquisition areas separately.

; Quantitative Value: 0.11 meters, Test that produced the value:

The following statements are derived in accordance

with the ASPRS Guidelines for Vertical Accuracy Reporting for LiDAR Data (Flood, M., 2004).

Tested 0.365 U.S. survey feet (0.111 meters) fundamental vertical accuracy at the

ninety-five percent confidence level in open terrain using RMSEz x 1.9600.

Tested 0.431 U.S. survey feet (0.131 meters) consolidated vertical accuracy

at the ninety-five percent confidence level in open terrain, high grass

and trees using RMSEz x 1.9600.

Completeness Report:

LiDAR data has been collected and processed for all areas within the project study area.

Conceptual Consistency:

Analysis of parallel acquisitioned EO shows a RMS of 1.801ft , 2.101 ft and 3.100 ft for XYZ, respectively.

Lineage

Process Steps

Process Step 1

CC ID: 1134936
Description:

During acquisition, two base stations were used to support the precise

positioning and orientation of the LiDAR sensor head. At times an additional base station set at the

Oxford Airport was used as a back-up. The base stations were positioned so that the aircraft would

be no further than 20-miles from a single base station at any time during the flight and were placed

on the control points established by Maptech during the ground control phase of the project. The LiDAR

acquisition commenced on December 17, 2009 and was completed on March 5, 2010. Initial processing of

the LiDAR data determined that reflights were necessary; in part because of sensor or base station

malfunctions. The reflights occurred between June 27, 2010 and July 9, 2010. To achieve better

penetration of the vegetation during the reflights, two passes were conducted over the reflight

area; one in each direction.

Detailed flight information and flight logs can be found in the separate Flight Report

submitted with the project.

Process Date/Time: 2010-03-05 00:00:00

Process Step 2

CC ID: 1134937
Description:

For redundancy and accuracy purposes, the airborne GPS data were processed from two base

stations using POSGPS from Applanix, Inc. The agreement between a minimum of two

solutions checked or combined between a minimum of two stations was better than 10 cm in

each of X, Y, and Z. These trajectories were used in the processing of the inertial data. The

inertial data were processed using POSProc from Applanix, Inc. This software produces an

SBET ("smooth best estimate of trajectory") using the GPS trajectory from POSGPS and the

roll, pitch and heading information recorded by the POS (Position Orientation System).

DASHMap uses the SBET to generate a set of data points for each laser return in the LAS file

format. Each data point is assigned an echo value so it can be segregated based on the first

and last pulse information. This project's data were processed in strip form, meaning each flight

line was processed independently. Processing the lines individually provides the data analyst

with the ability to QC the overlap between lines.

Each strip was then imported into a project using TerraScan (Terrasolid, Ltd.) and the project

management tool GeoCue (GeoCue Corp.). By creating a project the various flightlines are

combined while breaking the dataset as a whole into manageable pieces. This process also

converts the dataset from the geographic coordinate system (NAD83) to the State Plane

Coordinate System (NAD83), Mississippi West, Feet, and utilizing standard ESRI transformations.

The ellipsoid height values were converted to NAVD88, Feet, orthometric values using Geoid03,

provided by NGS.

Individual lines were then checked against adjacent lines and intersecting control lines to ensure

a cohesive dataset. The data from each line were then combined and LiDAR intensity images

were produced to visually check the horizontal positioning of the LiDAR data.

Stereo pairs were generated from the LiDAR intensity data using Geocue and LiDAR1CuePac

(Geocue Corp.). LiDARgrammetry was then utilized to collect breaklines where necessary along

hydro features to support the contour generation. These breaklines were collected as a 3D

element in the MicroStation (Bentley Systems, Inc.) environment utilizing ISSD (Z/I Imaging). A

Triangular Irregular Network (TIN) was generated using the final surface data. Contours were

then created from the TIN utilizing TerraModeler (Terrasolid, Ltd.).

Process Step 3

CC ID: 1134938
Description:

The NOAA Office for Coastal Management (OCM) received topographic files in text format from the

Mississippi Department of Environmental Quality (MDEQ). The files contained lidar easting,

northing and elevation. The data were received in Mississippi State Plane West 2302, NAD83

coordinates and were vertically referenced to NAVD88 using the Geoid03 model. The vertical and

horizontal units of the data were feet. OCM performed the following processing for data

storage and Digital Coast provisioning purposes:

1. The ASCII files were converted from txt format to las format using LASTools' txt2las

2. The LAS tiles were retiled to remove the buffer, then duplicate points were removed

3. The LAS tiles were then run through LASGround in order to extract surface classifications.

4. The las files were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid03.

5. The las files' vertical units were converted from feet to meters, removing bad elevations.

6. The las files were converted from a Projected Coordinate System (MS SP West) to a Geographic Coordinate system (NAD83)

7. The las files' horizontal units were converted from feet to decimal degrees and converted to laz format.

Process Date/Time: 2013-12-20 00:00:00

Catalog Details

Catalog Item ID: 49818
GUID: gov.noaa.nmfs.inport:49818
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:22+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: 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