50120
2011 U.S. Geological Survey (USGS) Topographic LiDAR: Louisiana Region 2
usgs2011_Louisiana_Region2_m1404_metadata
Data Set
Published / External
49401
Lidar - partner (no harvest)
Project
Completed
2011-04-15
TASK NAME: Louisiana Region 2 LiDAR ARRA Task Order
LiDAR Data Acquisition and Processing Production Task- Orleans, Plaquemines, St. Bernard, St. Tammany Parishes,
and Hancock County (MS)
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: NGTOC
Phone: (573) 308-3654
This task order consisted of LiDAR data acquisition and processing for Orleans, Plaquemines,
St. Bernard, St. Tammany Parishes in southeastern Louisiana, and Hancock County in southwestern Mississippi.
The task order area of interest encompasses approximately 7,301 square kilometers (2,819 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.
10764
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 discernable 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/geoid18/1404/supplemental/usgs2011_louisiana_region2_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/geoid18/1404/supplemental/usgs2011_louisiana_region2_footprint.kmz
Theme
ISO 19115 Topic Category
elevation
Office for Coastal Management
Charleston
SC
Data Set
As Needed
las
LiDAR points in LAS 1.2 format
none
Any conclusions drawn from the analysis of this information are not the responsibility
of Woolpert, USGS, the Office for Coastal Management or its partners.
Data Steward
2011-04-15
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Distributor
2011-04-15
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Metadata Contact
2011-04-15
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Point of Contact
2011-04-15
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Ground Condition
-90.006583
-89.026134
30.258269
28.90138
Discrete
2011-01-11
Discrete
2011-01-12
Discrete
2011-01-13
Discrete
2011-01-14
Discrete
2011-01-21
Discrete
2011-01-29
Discrete
2011-02-11
Discrete
2011-02-12
Discrete
2011-02-13
Discrete
2011-02-14
Discrete
2011-02-15
Discrete
2011-02-21
Discrete
2011-02-28
Discrete
2011-03-01
Yes
Unclassified
Unclassified
Unclassified
This data can be obtained on-line at the following URL:
https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1404
;
None
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.
https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1404
Customized Download
Create custom data files by choosing data area, product type, map projection, file format, datum, etc.
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1404/index.html
Bulk Download
Simple download of data files.
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1404/supplemental/usgs2011_louisiana_region2_footprint.kmz
Browse Graphic
Browse Graphic
kmz
This graphic shows the lidar coverage for Orleans Parish, Plaquemines Parish, St. Bernard Parish and St. Tammany Parish in Louisiana; and Hancock County, Mississippi
https://coast.noaa.gov
Online Resource
https://coast.noaa.gov/dataviewer
Online Resource
2016-05-23
Date that the source FGDC record was last modified.
2017-11-14
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.
2018-02-08
Partial upload of Positional Accuracy fields only.
2018-03-13
Partial upload to move data access links to Distribution Info.
Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; TerraSolid LTD: Terrascan Version 011.004
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 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)
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) feet vertical accuracy at 95 percent
confidence level.
The LIDAR data is visually inspected for completeness to ensure that are no gaps between flight lines.
All formatted data are validated using commercial GIS software to ensure proper formatting and loading prior to delivery.
1
Using a LH Systems ALS50 Light Detection And Ranging (LiDAR) system, 160 flight lines
of high density data, at a nominal pulse spacing (NPS) of 2.0 meters, were collected over approximately
7,301 square meters (2,819 square miles) of Orleans, Plaquemines, St. Bernard and St. Tammany Parishes in
southeastern Louisiana. Multiple returns were recorded for each laser pulse along with an intensity value
for each return. A total of sixteen missions were flown over a 12 day period: January 11 - 14, 2011,
January 21, 2011, January 29, 2011, February 11 - 15, 2011, February 21, 2011, February 28, 2001, and
March 1, 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 2
is referenced to UTM 16N 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 v93.
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.
2011-04-15T00:00:00
2
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.
2011-04-15T00:00:00
3
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.
2011-04-15T00:00:00
4
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.
2011-04-15T00:00:00
5
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).
2011-04-15T00:00:00
6
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 16 (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.
2012-10-01T00:00:00
gov.noaa.nmfs.inport:50120
Anne Ball
2017-11-15T15:24:24
SysAdmin InPortAdmin
2022-08-09T17:11:38
2022-03-16
OCM Partners
OCMP
1002
Public
No
2022-03-16
1 Year
2023-03-16