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Spatial Info
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Lineage
Catalog Details

Summary

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Short Citation
OCM Partners, 2024: 2011 U.S. Geological Survey (USGS) Topographic LiDAR: Louisiana Region 1, https://www.fisheries.noaa.gov/inport/item/50119.
Full Citation Examples

Abstract

TASK NAME: Louisiana Region 1 LiDAR ARRA Task Order

LiDAR Data Acquisition and Processing Production Task- Vermillion, Iberia, St. Mary, Terrebonne, and

Lafourche Parishes

USGS Contract No: G10PC00057

Task Order No: G10PD02781

Woolpert ORDER NUMBER: 70930

CONTRACTOR: Woolpert, Inc.

LiDAR data is a remotely sensed high resolution elevation data collected by an airborne platform. The LiDAR

sensor uses a combination of laser range finding, GPS positioning, and inertial measurement technologies.

The LiDAR systems collect data point clouds that are used to produce highly detailed Digital Elevation Models

(DEMs) of the earth's terrain, man-made structures, and vegetation. The task required the LiDAR data to be

collected at a nominal pulse spacing (NPS) of 2.0 meters. The final products include first, last, and at

least one intermediate return LAS, full classified LAS and a bare earth model in separate files.

Original contact information:

Contact Org: USGS (United States Geological Survey)

Title: USGS NGTOC

Phone: (573) 308-3654

Distribution Information

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

  • Simple download of data files.

Access Constraints:

None

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and some parts of this data may no longer represent actual surface conditions.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.

Controlled Theme Keywords

elevation

Child Items

No Child Items for this record.

Contact Information

Point of Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202
https://coast.noaa.gov

Metadata Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202
https://coast.noaa.gov

Extents

Geographic Area 1

-92.136664° W, -90.239927° E, 29.804761° N, 29.039005° S

Time Frame 1
2011-01-22
Time Frame 2
2011-01-23
Time Frame 3
2011-01-27
Time Frame 4
2011-02-12
Time Frame 5
2011-02-13
Time Frame 6
2011-02-17
Time Frame 7
2011-02-18
Time Frame 8
2011-02-28
Time Frame 9
2011-03-01
Time Frame 10
2011-03-10
Time Frame 11
2011-03-11
Time Frame 12
2011-03-15
Time Frame 13
2011-03-16
Time Frame 14
2011-04-06
Time Frame 15
2011-04-12

Item Identification

Title: 2011 U.S. Geological Survey (USGS) Topographic LiDAR: Louisiana Region 1
Short Name: usgs2011_Louisiana_Region1_m1403_metadata
Status: Completed
Publication Date: 2011-04-15
Abstract:

TASK NAME: Louisiana Region 1 LiDAR ARRA Task Order

LiDAR Data Acquisition and Processing Production Task- Vermillion, Iberia, St. Mary, Terrebonne, and

Lafourche Parishes

USGS Contract No: G10PC00057

Task Order No: G10PD02781

Woolpert ORDER NUMBER: 70930

CONTRACTOR: Woolpert, Inc.

LiDAR data is a remotely sensed high resolution elevation data collected by an airborne platform. The LiDAR

sensor uses a combination of laser range finding, GPS positioning, and inertial measurement technologies.

The LiDAR systems collect data point clouds that are used to produce highly detailed Digital Elevation Models

(DEMs) of the earth's terrain, man-made structures, and vegetation. The task required the LiDAR data to be

collected at a nominal pulse spacing (NPS) of 2.0 meters. The final products include first, last, and at

least one intermediate return LAS, full classified LAS and a bare earth model in separate files.

Original contact information:

Contact Org: USGS (United States Geological Survey)

Title: USGS NGTOC

Phone: (573) 308-3654

Purpose:

This task order consisted of LiDAR data acquisition and processing for Vermillion, Iberia, St. Mary,

Terrebonne, and Lafourche Parishes in southeastern Louisiana. The task order area of interest encompasses

approximately 6,684,759,312 square meters (2,581 square miles). The task required the LiDAR data to be

collected at a nominal pulse spacing (NPS) of 2.0 meters. The LiDAR data was collected to meet a vertical

accuracy requirement of 12.5 cm (0.41 ft) RMSE, or better. The final LiDAR data was delivered as

1,500m x 1,500m tiles, aligned to even 1,500m coordinates.

Notes:

10763

Supplemental Information:

The reflective surface data represents the DEM created by the laser energy reflected from the first surface

encountered by the laser pulse. Some energy may continue beyond this initial surface, to be reflected by a

subsequent surface as represented by the last return data. Intensity information is captured from the

reflective surface pulse and indicates the relative energy returned to the sensor, as compared to the

energy transmitted. The intensity image is not calibrated or normalized but indicates differences in energy

absorption due to the interaction of the surface materials with laser energy, at the wavelength transmitted

by the sensor. The bare earth model is created by identifying the returns that fall on the ground surface

and by interpolating a surface between these points. In this manner, buildings and vegetation are removed

from the bare earth model. This data set does not include bridges and overpasses in the bare earth model as

the delineation point for these structures is not reliably discernible in the LiDAR data.

The third-party QA report for this data set may be accessed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1403/supplemental/usgs2011_louisiana_region1_qa_report.pdf

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1403/supplemental/usgs2011_louisiana_region1_footprint.kmz

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation

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 LAS 1.2 format

Entity Attribute Detail Citation:

none

Distribution Liability:

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

of Woolpert, USGS, the Office for Coastal Management or its partners.

Support Roles

Data Steward

CC ID: 691182
Date Effective From: 2011-04-15
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: 691184
Date Effective From: 2011-04-15
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: 691185
Date Effective From: 2011-04-15
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: 691183
Date Effective From: 2011-04-15
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: 1133131
W° Bound: -92.136664
E° Bound: -90.239927
N° Bound: 29.804761
S° Bound: 29.039005

Extent Group 1 / Time Frame 1

CC ID: 1133116
Time Frame Type: Discrete
Start: 2011-01-22

Extent Group 1 / Time Frame 2

CC ID: 1133117
Time Frame Type: Discrete
Start: 2011-01-23

Extent Group 1 / Time Frame 3

CC ID: 1133118
Time Frame Type: Discrete
Start: 2011-01-27

Extent Group 1 / Time Frame 4

CC ID: 1133119
Time Frame Type: Discrete
Start: 2011-02-12

Extent Group 1 / Time Frame 5

CC ID: 1133120
Time Frame Type: Discrete
Start: 2011-02-13

Extent Group 1 / Time Frame 6

CC ID: 1133121
Time Frame Type: Discrete
Start: 2011-02-17

Extent Group 1 / Time Frame 7

CC ID: 1133122
Time Frame Type: Discrete
Start: 2011-02-18

Extent Group 1 / Time Frame 8

CC ID: 1133123
Time Frame Type: Discrete
Start: 2011-02-28

Extent Group 1 / Time Frame 9

CC ID: 1133124
Time Frame Type: Discrete
Start: 2011-03-01

Extent Group 1 / Time Frame 10

CC ID: 1133125
Time Frame Type: Discrete
Start: 2011-03-10

Extent Group 1 / Time Frame 11

CC ID: 1133126
Time Frame Type: Discrete
Start: 2011-03-11

Extent Group 1 / Time Frame 12

CC ID: 1133127
Time Frame Type: Discrete
Start: 2011-03-15

Extent Group 1 / Time Frame 13

CC ID: 1133128
Time Frame Type: Discrete
Start: 2011-03-16

Extent Group 1 / Time Frame 14

CC ID: 1133129
Time Frame Type: Discrete
Start: 2011-04-06

Extent Group 1 / Time Frame 15

CC ID: 1133130
Time Frame Type: Discrete
Start: 2011-04-12

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

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/#/lidar/search/where:ID=1403

;

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: 743127
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1403
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: 743128
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1403/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 743130
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 743131
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 743132
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1403/supplemental/usgs2011_louisiana_region1_footprint.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar coverage for Vermillion Parish, Iberia Parish, St. Mary Parish, Terrebonne Parish and Lafourche Parish in Louisiana.

Activity Log

Activity Log 1

CC ID: 691216
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 691215
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: 718723
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 743129
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Technical Environment

Description:

Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; TerraSolid LTD: Terrascan Version 011.004

Data Quality

Accuracy:

The LiDAR collected for this task order was collected at a vertical accuracy of

12.5 cm (0.41 ft) Root Mean Squared (RMSE), or better.

| Quantitative Value: 12.5 cm (0.41 ft) RMSE | Quantitative Test Explanation: Points measured will produce an error less than 12.5 cm (0.41 ft) RMSE.

Horizontal Positional Accuracy:

Horizontal accuracy is +/- 3.8-foot at the 95% confidence level using RMSE(r) x 1.9600 as defined by the

FGDC Geospatial Positional Accuracy Standards, Part 3: NSSDA.

; Quantitative Value: 1.16 meters, Test that produced the value: LiDAR system calibration is available in the project report. reported as 3.8 ft (116 cm)

Vertical Positional Accuracy:

The LiDAR data vertical accuracy RMSE is 7.0 cm (0.229 ft).

The data collected under this Task Order meets the National Standard for Spatial Database Accuracy (NSSDA)

accuracy standards. The NSSDA standards specify that vertical accuracy be reported at the 95 percent

confidence level for data tested by an independent source of higher accuracy.

(http://www.fgdc.gov/standards/projects/FGDC-standards-projects/accuracy/part3/index_html).

The Fundamental Vertical Accuracy (FVA) of the TIN: 13.72 cm (0.45 ft) at a 95% confidence level,

derived according to NSSDA, i.e., based on RMSE of 12.5 cm in the "open terrain" land cover category.

; Quantitative Value: 0.07 meters, Test that produced the value: Tested 13.72 cm (0.45 ft) vertical accuracy at 95 percent confidence level.

Completeness Report:

The LIDAR data is visually inspected for completeness to ensure that are no gaps between flight lines.

Conceptual Consistency:

All formatted data are validated using commercial GIS software to ensure proper formatting and loading

prior to delivery.

Lineage

Process Steps

Process Step 1

CC ID: 1133109
Description:

Using a LH Systems ALS50 Light Detection And Ranging (LiDAR) system, 126 flight lines

of high density data, at a nominal pulse spacing (NPS) of 2.0 meters, were collected over approximately

6,684,759,312 square meters (2,581 square miles) of Vermillion, Iberia, St. Mary, Terrebonne, and Lafourche

Parishes in southeastern Louisiana. Multiple returns were recorded for each laser pulse along with an

intensity value for each return. A total of eighteen missions were flown over a 15 day period:

January 22, 2011, January 23, 2011, January 27, 2011, February 12, 2011, February 13, 2011, February 17, 2001,

February 18, 2011, February 28, 2011, March 1, 2011, March 10, 2011, March 11, 2011, March 15, 2011, March 16, 2011,

April 6, 2011, and April 12, 2011. A minimum of two airborne global positioning system (GPS) base stations

were used in support of the LiDAR data acquisition. 22 ground control points were surveyed through static

methods. The geoid used to reduce satellite derived elevations to orthometric heights was Geoid09. All data

for Region 1 is referenced to UTM 15N for the area within its zone, NAD83, NAVD88, in meters. Airborne GPS

data was differentially processed and integrated with the post processed IMU data to derive a smoothed best

estimate of trajectory (SBET). The SBET was used to reduce the LiDAR slant range measurements to a raw

reflective surface for each flight line. The coverage was classified to extract a bare earth digital

elevation model (DEM) and separate last returns. In addition to the LAS deliverables, one layer of coverage

was delivered in the ArcINFO ArcGrid binary format 2m cell size: bare-earth. The ArcGrid data was created

using ArcMap v9.3 software. System Parameters: - Type of Scanner = LH Systems ALS50 - Data Acquisition

Height = 2,377-meters AGL - Scanner Field of View = 40 degrees - Scan Frequency = 36.7 Hertz - Pulse

Repetition Rate = 99.0 Kilohertz - Aircraft Speed = 140 Knots - Swath Width = 1730-meters - Number of

Returns Per Pulse = Maximum of 4 - Distance Between Flight Lines = 1212-meters.

Process Date/Time: 2011-04-15 00:00:00

Process Step 2

CC ID: 1133110
Description:

The ALS50 calibration and system performance is verified on a periodic basis using

Woolpert's calibration range. The calibration range consists of a large building and runway. The edges of

the building and control points along the runway have been located using conventional survey methods.

Inertial measurement unit (IMU) misalignment angles and horizontal accuracy are calculated by comparing the

position of the building edges between opposing flight lines. The scanner scale factor and vertical

accuracy is calculated through comparison of LiDAR data against control points along the runway. Field

calibration is performed on all flight lines to refine the IMU misalignment angles. IMU misalignment angles

are calculated from the relative displacement of features within the overlap region of adjacent (and opposing)

flight lines. The raw LiDAR data is reduced using the refined misalignment angles.

Process Date/Time: 2011-04-15 00:00:00

Process Step 3

CC ID: 1133111
Description:

Once the data acquisition and GPS processing phases are complete, the LiDAR data was

processed immediately to verify the coverage had no voids. The GPS and IMU data was post processed using

differential and Kalman filter algorithms to derive a best estimate of trajectory. The quality of the

solution was verified to be consistent with the accuracy requirements of the project.

Process Date/Time: 2011-04-15 00:00:00

Process Step 4

CC ID: 1133112
Description:

The individual flight lines were inspected to ensure the systematic and residual errors have been

identified and removed. Then, the flight lines were compared to adjacent flight lines for any mismatches

to obtain a homogeneous coverage throughout the project area. The point cloud underwent a classification

process to determine bare-earth points and non-ground points utilizing "first and only" as well as "last

of many" LiDAR returns. This process determined bare-earth points (Class 2), Noise (Class 7), Water (Class 9)

Ignored ground (Class 10) and unclassified data (Class 1). The bare-earth (Class 2 - Ground) LiDAR points

underwent a manual QA/QC step to verify that artifacts have been removed from the bare-earth surface. The

surveyed ground control points are used to perform the accuracy checks and statistical analysis of the

LiDAR dataset.

Process Date/Time: 2011-04-15 00:00:00

Process Step 5

CC ID: 1133113
Description:

Breaklines defining lakes, greater than two acres, and double-line streams, wider than 30.5 meters (100 feet),

were compiled using digital photogrammetric techniques as part of the hydrographic flattening process and

provided as ESRI Polyline Z and Polygon Z shape files. Breaklines defining water bodies and streams were

compiled for this task order. The breaklines were used to perform the hydrologic flattening of water

bodies, and gradient hydrologic flattening of double line streams. Lakes, reservoirs and ponds, at a

nominal minimum size of two (2) acres or greater, were compiled as closed polygons. The closed water bodies

were collected at a constant elevation. Rivers and streams, at a nominal minimum width of 30.5 meters (100 feet),

were compiled in the direction of flow with both sides of the stream maintaining an equal gradient

elevation. The draping of the polygons and double lines streams was performed using proprietary software

developed by Woolpert. The hydrologic flattening of the LiDAR data was performed for inclusion in the

National Elevation Dataset (NED).

Process Date/Time: 2011-04-15 00:00:00

Process Step 6

CC ID: 1133114
Description:

The NOAA Office for Coastal Management (OCM) received topographic files in LAS format. The files contained lidar

elevation and intensity measurements. The data were received in UTM Zone 15 (NAD83) coordinates

and were vertically referenced to NAVD88 using the Geoid09 model. The vertical units of the data were

meters. OCM performed the following processing for data storage and Digital Coast provisioning purposes:

1. The topographic las files were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid09.

Process Date/Time: 2012-10-01 00:00:00

Catalog Details

Catalog Item ID: 50119
GUID: gov.noaa.nmfs.inport:50119
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:24+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