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Summary

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Short Citation
OCM Partners, 2024: 2014 USGS/NRCS Lidar: Central MS, https://www.fisheries.noaa.gov/inport/item/49826.
Full Citation Examples

Abstract

TASK NAME: USGS-NRCS Laurel MS 0.7m NPS LIDAR

Lidar Data Acquisition and Processing Production Task

USGS Contract No. G10PC00057

Task Order No. G13PD01086

Woolpert Order No. 073741

CONTRACTOR: Woolpert, Inc.

This data set is comprised of lidar point cloud data for the project area. This task order required lidar data to be acquired in two separate AOI's over 10 counties in Mississippi; Attala, Leake, Lexington, Montgomery, Scott, Smith, Webster Counties and a portion of Carroll, Choctaw and Jasper Counties and two counties in Alabama; Washington and Choctaw. AOI is approximately 7,400 square miles. The lidar data were acquired and processed under the requirements identified in this task order. 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 0.7 meters. The final products include classified LAS, one (1) meter pixel raster DEMs of the bare-earth surface in ERDAS IMG Format, and 8-bit intensity images. Each LAS file contains lidar point information, which has been calibrated, controlled, and classified. Additional deliverables include hydrologic breakline data,control data, tile index, lidar processing and survey reports in PDF format, FGDC metadata files for each data deliverable in .xml format, and LAS swath data. Collected swath files that were larger than 2GB were provided in multiple sub-swath files, each less than 2GB. Ground conditions: Water at normal levels; no unusual inundation; no snow; leaf off.

Distribution Information

  • Not Applicable

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

  • LAS/LAZ - LASer

    Simple download of data files, hosted on USGS' Rocky Web portal.

Access Constraints:

No restrictions apply to this data.

Use Constraints:

None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.

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

-90.277723° W, -88.899496° E, 33.738538° N, 31.779659° S

Time Frame 1
2014-01-07
Time Frame 2
2014-01-08
Time Frame 3
2014-01-09
Time Frame 4
2014-01-11
Time Frame 5
2014-01-12
Time Frame 6
2014-01-14
Time Frame 7
2014-01-15
Time Frame 8
2014-01-16
Time Frame 9
2014-01-17
Time Frame 10
2014-01-18
Time Frame 11
2014-01-19
Time Frame 12
2014-01-20
Time Frame 13
2014-01-21
Time Frame 14
2014-01-22
Time Frame 15
2014-01-25
Time Frame 16
2014-02-15

Item Identification

Title: 2014 USGS/NRCS Lidar: Central MS
Short Name: Alt Name: MS Laurel 2014
Status: Completed
Publication Date: 2017-06-14
Abstract:

TASK NAME: USGS-NRCS Laurel MS 0.7m NPS LIDAR

Lidar Data Acquisition and Processing Production Task

USGS Contract No. G10PC00057

Task Order No. G13PD01086

Woolpert Order No. 073741

CONTRACTOR: Woolpert, Inc.

This data set is comprised of lidar point cloud data for the project area. This task order required lidar data to be acquired in two separate AOI's over 10 counties in Mississippi; Attala, Leake, Lexington, Montgomery, Scott, Smith, Webster Counties and a portion of Carroll, Choctaw and Jasper Counties and two counties in Alabama; Washington and Choctaw. AOI is approximately 7,400 square miles. The lidar data were acquired and processed under the requirements identified in this task order. 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 0.7 meters. The final products include classified LAS, one (1) meter pixel raster DEMs of the bare-earth surface in ERDAS IMG Format, and 8-bit intensity images. Each LAS file contains lidar point information, which has been calibrated, controlled, and classified. Additional deliverables include hydrologic breakline data,control data, tile index, lidar processing and survey reports in PDF format, FGDC metadata files for each data deliverable in .xml format, and LAS swath data. Collected swath files that were larger than 2GB were provided in multiple sub-swath files, each less than 2GB. Ground conditions: Water at normal levels; no unusual inundation; no snow; leaf off.

Purpose:

The purpose of this project is for lidar mapping services in support of the USGS for task name USGS Laurel (Central) MS 0.7m NPS Lidar Task Order.

Notes:

10470

Supplemental Information:

The Lidar Report may be accessed here:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/5181/supplemental/ms2014_usgs_central_ms_m5181_lidar_report.pdf

The following are the USGS lidar fields in JSON:

{

"ldrinfo" : {

"ldrspec" : "USGS NGP Base Specifications v1",

"ldrsens" : "Leica ALS70/Optech Gemini",

"ldrmaxnr" : "4/4",

"ldrnps" : "0.7",

"ldrdens" : "2",

"ldrfltht" : "1981/1524",

"ldrfltsp" : "150/130",

"ldrscana" : "40/24",

"ldrscanr" : "42.3/46",

"ldrpulsr" : "272/125",

"ldrpulsd" : "5/7",

"ldrpulsw" : "5/7",

"ldrwavel" : "1064/1064",

"ldrmpia" : "1/1",

"ldrbmdiv" : "0.22/.25",

"ldrswatw" : "1442/721",

"ldrswato" : "25/30",

"ldrcrs" : "NAD_1983(2011)_UTM_Zone_16N_Meters",

"ldrgeoid" : "GEOID12A"

},

"ldraccur" : {

"ldrchacc" : "0.360",

"rawfva" : "0.129",

"clsfva" : "0.031",

"clscva" : "0.207",

"clssvas" : {

"svalctyp" : "Urban",

"svavalue" : "0.180"

},

"clssvas" : {

"svalctyp" : "Tall Weeds and Crops",

"svavalue" : "0.228"

},

"clssvas" : {

"svalctyp" : "Brush Lands and Trees",

"svavalue" : "0.261"

},

"clssvas" : {

"svalctyp" : "Forested and Fully Grown",

"svavalue" : "0.177"

}

},

"lasinfo" : {

"lasver" : "1.2",

"lasprf" : "1",

"laswheld" : "Geometrically unreliable points were identified using a combination of automated and manual techniques and subsequently classified as swath overlap and or noise.",

"lasolap" : "swath overlap points were identified in these files by adding 16 to the standard classication values",

"lasintr" : "8",

"lasclass" : {

"clascode" : "1",

"clasitem" : "default/unclassified"

},

"lasclass" : {

"clascode" : "2",

"clasitem" : "Bare-earth"

},

"lasclass" : {

"clascode" : "7",

"clasitem" : "All noise"

},

"lasclass" : {

"clascode" : "9",

"clasitem" : "Water"

},

"lasclass" : {

"clascode" : "10",

"clasitem" : "Ignored ground"

},

"lasclass" : {

"clascode" : "17",

"clasitem" : "Overlap default/unclassified"

},

"lasclass" : {

"clascode" : "18",

"clasitem" : "Overlap ground"

}

}}

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: Lidar point cloud
Distribution Liability:

Woolpert prepared the original data as set forth in the Scope of Services, in accordance with reasonable care and due diligence as set forth in this Agreement, however, due to the easily alterable nature of electronic media, files, documents, and other deliverables, Woolpert, Inc. makes no warranties, either expressed or implied, with respect to the accuracy, completeness, merchantability, or fitness for any particular purpose, including, but not limited to, use of any/all data as described within this metadata file, by any user of this data. Any use will be at the end-user's sole risk. Any conclusions drawn from the analysis of this information are not the responsibility of Woolpert, Inc., USGS, NRCS, MDEQ, NOAA, the NOAA Office for Coastal Management (OCM) or its partners.

Support Roles

Data Steward

CC ID: 679016
Date Effective From: 2017-06-14
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: 679018
Date Effective From: 2017-06-14
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: 679019
Date Effective From: 2017-06-14
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: 679017
Date Effective From: 2017-06-14
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: 1138400
W° Bound: -90.277723
E° Bound: -88.899496
N° Bound: 33.738538
S° Bound: 31.779659

Extent Group 1 / Time Frame 1

CC ID: 1138384
Time Frame Type: Discrete
Start: 2014-01-07

Extent Group 1 / Time Frame 2

CC ID: 1138385
Time Frame Type: Discrete
Start: 2014-01-08

Extent Group 1 / Time Frame 3

CC ID: 1138386
Time Frame Type: Discrete
Start: 2014-01-09

Extent Group 1 / Time Frame 4

CC ID: 1138387
Time Frame Type: Discrete
Start: 2014-01-11

Extent Group 1 / Time Frame 5

CC ID: 1138388
Time Frame Type: Discrete
Start: 2014-01-12

Extent Group 1 / Time Frame 6

CC ID: 1138389
Time Frame Type: Discrete
Start: 2014-01-14

Extent Group 1 / Time Frame 7

CC ID: 1138390
Time Frame Type: Discrete
Start: 2014-01-15

Extent Group 1 / Time Frame 8

CC ID: 1138391
Time Frame Type: Discrete
Start: 2014-01-16

Extent Group 1 / Time Frame 9

CC ID: 1138392
Time Frame Type: Discrete
Start: 2014-01-17

Extent Group 1 / Time Frame 10

CC ID: 1138393
Time Frame Type: Discrete
Start: 2014-01-18

Extent Group 1 / Time Frame 11

CC ID: 1138394
Time Frame Type: Discrete
Start: 2014-01-19

Extent Group 1 / Time Frame 12

CC ID: 1138395
Time Frame Type: Discrete
Start: 2014-01-20

Extent Group 1 / Time Frame 13

CC ID: 1138396
Time Frame Type: Discrete
Start: 2014-01-21

Extent Group 1 / Time Frame 14

CC ID: 1138397
Time Frame Type: Discrete
Start: 2014-01-22

Extent Group 1 / Time Frame 15

CC ID: 1138398
Time Frame Type: Discrete
Start: 2014-01-25

Extent Group 1 / Time Frame 16

CC ID: 1138399
Time Frame Type: Discrete
Start: 2014-02-15

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=5181;

Data Access Constraints:

No restrictions apply to this data.

Data Use Constraints:

None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.

Distribution Information

Distribution 1

CC ID: 741561
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=5181
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2017-06-14 - Present)
File Name: Customized Download
Description:

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

Distribution Format: Not Applicable
Compression: Zip

Distribution 2

CC ID: 741562
Download URL: https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/NRCS_Laurel_MS_07M_NPS_LiDAR/MS_Laurel_2014/LAZ/
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2017-06-14 - Present)
File Name: Bulk Download
Description:

Simple download of data files, hosted on USGS' Rocky Web portal.

Distribution Format: LAS/LAZ - LASer
Compression: LAZ

URLs

URL 1

CC ID: 741565
URL: https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/NRCS_Laurel_MS_07M_NPS_LiDAR/MS_Laurel_2014/reports/Lidar%20Survey%20Rpt_NRCS%20Laurel%20MS_Dec2014.pdf
Name: Lidar Survey Report
URL Type:
Online Resource
File Resource Format: pdf
Description:

Contractor provided vertical accuracy survey report.

URL 2

CC ID: 741566
URL: https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/NRCS_Laurel_MS_07M_NPS_LiDAR/MS_Laurel_2014/reports/Lidar%20Rpt_USGS%20LaurelMS%20Lidar_Dec2014.pdf
Name: Lidar Collection Report
URL Type:
Online Resource
File Resource Format: PDF
Description:

Contractor provided lidar collection report, hosted on USGS' RockyWeb Portal.

URL 3

CC ID: 741567
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/5181/supplemental/ms2014_usgs_central_m5181.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar footprint for the 2014 USGS/NRCS Central MS lidar project.

Activity Log

Activity Log 1

CC ID: 679047
Activity Date/Time: 2017-07-07
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 679046
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: 718397
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 741563
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Technical Environment

Description:

Microsoft Windows 7 Version 6.1 (Build 7600); ArcMap 10.2; ArcCatalog 10.2; TerraScan ver. 14.003; TerraModeler ver. 14.003; Geocue 2012.1.27.5; LP360 2011.1.54.1. Approximate size of entire delivery dataset = 6.5 TB

Data Quality

Horizontal Positional Accuracy:

Compiled to meet 0.360 meters horizontal accuracy at 95 percent confidence level. Lidar system specifications are available in the project report

Vertical Positional Accuracy:

LAS data covering the Laurel MS Lidar 0.7 meter NPS Lidar Task Order was compared to independent survey control points to determine the FVA of the LAS Swath and of the Bare-Earth DEM. In addition, this LAS data was compared to independent supplemental points from categories: Urban, Tall Weeds/Crops, and Brush Lands/Trees, and Forested/Fully Grown.

Fundamental Vertical Accuracy (FVA)

Raw LAS Swath Fundamental Vertical Accuracy (FVA) Tested 0.129 meters fundamental vertical accuracy at a 95 percent confidence level, derived according to NSSDA, using 0.066 meters (RMSEz) x 1.96000 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the TIN.

Bare-Earth DEM Fundamental Vertical Accuracy (FVA) Tested 0.137 meters fundamental vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using 0.055 meters (RMSEz) x 1.96000 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the DEM.

Supplemental Vertical Accuracy (SVA)

Urban Land Cover Classification Supplemental Vertical Accuracy (SVA) Tested 0.180 meters supplemental vertical accuracy at the 95th percentile in the Urban supplemental class reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the DEM.

Tall Weeds/Crops Land Cover Classification Supplemental Vertical Accuracy (SVA) Tested 0.228 meters supplemental vertical accuracy at the 95th percentile in the Tall Weeds/Crops supplemental class reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the DEM.

Brushlands/Trees Land Cover Classification Supplemental Vertical Accuracy (SVA) Tested 0.261 meters supplemental vertical accuracy at the 95th percentile in the Brushlands/Trees supplemental class reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the DEM.

Forested and Fully Grown Land Cover Classification Supplemental Vertical Accuracy (SVA) Tested 0.177 meters supplemental vertical accuracy at the 95th percentile in the Forested/Fully Grown supplemental class reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the DEM.

Consolidated Vertical Accuracy (CVA)

Tested 0.207 meters consolidated vertical accuracy at the 95th percentile level; reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the DEM. CVA is based on the 95th percentile error in all land cover categories combined.

Completeness Report:

The lidar data is visually inspected for completeness to ensure that are no void areas or missing data.

Conceptual Consistency:

All formatted data cover the entire area specified for this project and are validated using a combination of commercial lidar processing software, GIS software, and proprietary programs to ensure proper formatting and loading prior to delivery.

Lineage

Sources

Lidar acquisition

CC ID: 1138374
Publish Date: 2014-12-22
Extent Type: Discrete
Extent Start Date/Time: 2014-01-07
Source Contribution:

This data set is the project specified acquired point cloud data. | Type of Source Media: Lidar dataset

Lidar deliverable processing

CC ID: 1138375
Publish Date: 2014-12-22
Extent Type: Discrete
Extent Start Date/Time: 2014-01-07
Source Contribution:

This data set is the project specified lidar deliverables. | Type of Source Media: Lidar dataset

Survey Control Acquisition

CC ID: 1138376
Publish Date: 2014-12-22
Extent Type: Discrete
Extent Start Date/Time: 2014-01-24
Source Contribution:

This data set is the project specified acquired ground control and QAQC control data. | Type of Source Media: Control dataset

Survey Control Acquistion

CC ID: 1138377
Publish Date: 2014-12-22
Extent Type: Discrete
Extent Start Date/Time: 2013-11-13
Source Contribution:

This data set is the project specified acquired ground control and QAQC control data. | Type of Source Media: Control dataset

Process Steps

Process Step 1

CC ID: 1138378
Description:

USGS-NRCS Laurel MS 0.7m NPS Lidar Acquisition - Using one Leica ALS70 (lidar) and one Optech Gemini (lidar) system on board a Cessna 404 and Cessna 310 aircraft respectively, high density data, at a nominal pulse spacing (NPS) of 0.7 meters, were collected for this task order (approximately 7,400 square miles). Leica Specs- AGL = 1981 meters - Aircraft Speed = 150 Knots, Field of View (Full) = 40 degrees, Pulse Rate = 272 kHz, Scan Rate = 41.6 Hz, with an average side lap of 25%. Optech Specs- AGL = 1524 meters - Aircraft Speed = 130 Knots, Field of View (Full) = 24 degrees, Pulse Rate = 125 kHz, Scan Rate = 46 Hz, with an average side lap of 30%. Multiple returns were recorded for each laser pulse along with an intensity value for each return. Forty-one (41) missions were flown between January 7, 2014 and February 15, 2014. Twelve (12) Global Navigation Satellite System (GNSS) Base Stations were used in support of the lidar data acquisition. Specific information regarding latitude, longitude, and ellipsoid height to the L1 phase center is included in the lidar processing report. The geoid used to reduce satellite derived elevations to orthometric heights was GEOID12A. Data for the task order is referenced to the UTM Zone 16N, North American Datum of 1983 (2011), and NAVD88, in meters. 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. 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. The ALS70/Optech Gemini 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: 2014-02-15 00:00:00
Source: Lidar acquisition

Process Step 2

CC ID: 1138379
Description:

USGS-NRCS Laurel MS 0.7m NPS Lidar ground control and QAQC control Acquisition - Ground control and QAQC control point survey for the Mississippi AOI was performed by Woolpert surveyors, to support the USGS-NRCS Laurel MS 0.7m NPS Lidar project. All surveys were performed in such a way as to achieve ground control that supports lidar data at 9.25 cm RMSE accuracy and satisfy a local network accuracy of 5 cm at a 95% confidence level. All ground control survey field activities took place from 11/13/2013 thru 11/23/13. Woolpert collected control data for data processing as supplemental QAQC points. The supplemental QAQC points were collected to be used in independent accuracy testing. The field crew utilized Real-Time Kinematic (RTK) GPS surveying throughout most of the ground control data collection process. Using RTK GPS techniques, observations were performed on 26 ground control points and 161 quality control check points. The survey was conducted using a 1-second epoch rate, in a fixed solution RTK mode, with each observation lasting between 60 to 180 seconds. Each station was occupied twice to insure the necessary horizontal and vertical accuracies were being met for this photogrammetric project. In addition to the RTK GPS techniques, the project field crew utilized rapid-static (RS) GPS surveying techniques to establish RTK Base stations within areas lacking sufficient NGS control monument stations. Using Rapid-Static GPS techniques, observations were performed on one (2) RTK Base stations (110 & 111). The survey was conducted at a 5-second sync rate with each observation lasting between 40-360 minutes. All horizontal GPS control was based on UTM Zone 16N, NAD83 (2011) expressed in meters. The vertical datum used for this project was based on the North American Vertical Datum of 1988 (NAVD88), GEOID12A, also expressed in meters.

Process Date/Time: 2013-11-14 00:00:00
Source: Survey Control Acquisition

Process Step 3

CC ID: 1138380
Description:

USGS-NRCS Laurel MS 0.7m NPS Lidar ground control and QAQC control Acquisition - Ground control and QAQC control point survey for the Alabama AOI was performed by Magnolia River surveyors, to support the USGS-NRCS Laurel MS 0.7m NPS Lidar project. All surveys were performed in such a way as to achieve ground control that supports lidar data at 9.25 cm RMSE accuracy and satisfy a local network accuracy of 5 cm at a 95% confidence level. All ground control survey field activities took place from 01/24/2014 thru 04/03/14. Magnolia River surveyors collected control data for data processing as supplemental QAQC points. The supplemental QAQC points were collected to be used in independent accuracy testing. The field crew utilized Real-Time Kinematic (RTK) GPS surveying utilizing the Alabama Department of Transportation (ALDOT) Continually Operating Reference Station (CORS) network, via the internet using TCP/IP protocol and MiFi cellular connection. ALDOT provides single base corrections from the nearest operating GPS reference station. Using RTK GPS techniques, observations were performed on 21 ground control points and 115 quality control check points. The survey was conducted using a 1-second epoch rate, in a fixed solution RTK mode, with each observation lasting between 60 to 180 seconds. Each station was occupied twice to insure the necessary horizontal and vertical accuracies were being met for this photogrammetric project. A Sokkia Set330R3 total station in combination with a Trimble TSC3 data collector was used in areas where sufficient satellite coverage was not available for some quality control check points. All horizontal GPS control was based on UTM Zone 16N, NAD83 (2011) expressed in meters. The vertical datum used for this project was based on the North American Vertical Datum of 1988 (NAVD88), GEOID12A, also expressed in meters.

Process Date/Time: 2014-01-25 00:00:00

Process Step 4

CC ID: 1138381
Description:

USGS-NRCS Laurel MS 0.7m NPS Lidar Deliverable Processing - 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 Default (Class 1), Ground (Class 2), Noise (Class 7), Water (Class 9), Ignored Ground (Class 10), Overlap Default (Class 17) and Overlap Ground (Class 18). The bare-earth (Class 2 - Ground) lidar points underwent a manual QA/QC step to verify the quality of the DEM as well as a peer-based QC review. This included a review of the DEM surface to remove artifacts and ensure topographic quality. Classification of water (class 9) and ignored ground (class 10) was completed via the use of the hydrologic breaklines collected for the hydro-flattening phase. The overlap classes were determined by first identifying the overlapping areas and reclassifying the LAS data by offset from a corridor. This allows the returns located on the edge of the swath to be removed from the bare earth coverage in an effort to produce a more uniform data density. The returns determined to be overlap are then further classified to produce overlap default (class 17) and overlap ground (class 18). The surveyed ground control points are used to make vertical adjustments to the data set and to perform the accuracy checks and statistical analysis of the lidar dataset. Supervisory QC monitoring of work in progress and completed editing ensured consistency of classification character and adherence to project requirements across the entire project area. The resulting deliverables for this task order consist of classified LAS file in LAS 1.2 format, Raw Swath LAS files in LAS 1.2 format, 1 meter pixel size DEM files in ERDAS IMG format, 1 meter pixel size 8-bit Intensity files in GeoTIFF format, and Hydrologic Breakline data in ESRI shape file format.

Process Date/Time: 2014-01-08 00:00:00
Source: Lidar deliverable processing

Process Step 5

CC ID: 1138382
Description:

The NOAA Office for Coastal Management (OCM) processed the data to the Digital Coast using the USGS Entwine Point Tile collection, hosted on Amazon Web Services.

Process Date/Time: 2023-12-18 00:00:00
Process Contact: Office for Coastal Management (OCM)

Catalog Details

Catalog Item ID: 49826
GUID: gov.noaa.nmfs.inport:49826
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:22+0000
Metadata Record Last Modified By: Blake Waring
Metadata Record Last Modified: 2023-12-18 16:27+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