Short Citation:
Office for Coastal Management, 2021: 2015 Cook & Tift County (GA) Lidar, https://www.fisheries.noaa.gov/inport/item/48184.

Item Identification

Title: 2015 Cook & Tift County (GA) Lidar
Short Name: ga2016_cook_tift_m5089_metadata
Status: Completed
Publication Date: 2016-07
Abstract:

TASK NAME: NOAA OCM Tift and Cook Counties GA Lidar Data Acquisition and Processing Production Task

NOAA Contract No. EA133C-11-CQ-0010

Woolpert Order No. 75271

CONTRACTOR: Woolpert, Inc.

This data set is comprised of lidar point cloud data, raster DEM, hydrologic 3-d breaklines, flightline vectors, survey control, project tile index, and project data extent. This task order requires lidar data to be acquired over the Tift and Cook Counties, GA area of interest (AOI), and will be acquired as part of this task order. The total area of the Tift and Cook Counties, GA AOI is approximately 515 square miles. The lidar data acquisition parameters for this mission are detailed in the lidar processing report for this task order. The lidar data will be 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, four (4) foot pixel raster DEMs of the bare-earth surface ESRI Grid Format. Each LAS file contains lidar point information, which has been calibrated, controlled, and classified. Additional deliverables include hydrologic breakline data, flightline vectors, control data, tile index, lidar processing and survey reports in PDF format, FGDC metadata files for each data deliverable in .xml format. Ground conditions: Water at normal levels; no unusual inundation; no snow.

Original contact information:

Contact Org: Woolpert

Phone: (937) 461-5660

Purpose:

The lidar data will be acquired and processed under the requirements identified in this task order. The data produced for this AOI is intended for use in community decision making, including storm water management applications, such as floodplain mapping.

Notes:

10207

Supplemental Information:

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

https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/5089/supplemental/ga2016_cook_tift_m5089.kmz

The lidar report for this project is available at:

https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/5089/supplemental/ga2016_cook_tift_m5089_lidarreport.pdf

The survey report for this project is available at:

https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/5089/supplemental/ga2016_cook_tift_m5089_surveyreport.pdf

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords Earth Science > Land Surface > Topography > Terrain Elevation > Topographical Relief Maps
Global Change Master Directory (GCMD) Science Keywords Earth Science > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography
Global Change Master Directory (GCMD) Science Keywords Earth Science > Oceans > Coastal Processes > Coastal Elevation
ISO 19115 Topic Category elevation
None Elevation
None LiDAR
None Model
None Remote Sensing
None Topography

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords Continent > North America > United States Of America > Georgia
None Cook County
None Georgia
None Tift County

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: Unknown
Entity Attribute Overview:

Files in LAZ format (Classifications 1,2,7,9,10,17,18)

Entity Attribute Detail Citation:

none

Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of Woolpert, Cook & Tift County, the NOAA Office for Coastal Management, or its partners.

Support Roles

Data Steward

CC ID: 623953
Date Effective From: 2016-07
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: 623955
Date Effective From: 2016-07
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: 623956
Date Effective From: 2016-07
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: 623954
Date Effective From: 2016-07
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: 623959
W° Bound: -83.667825
E° Bound: -83.277839
N° Bound: 31.599032
S° Bound: 31.026225

Extent Group 1 / Time Frame 1

CC ID: 623958
Time Frame Type: Range
Start: 2016-02-14
End: 2016-02-16

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=5089;

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: 743844
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=5089
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: 743845
Download URL: https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/5089
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 743847
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 743848
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 743849
URL: https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/5089/supplemental/ga2016_cook_tift_m5089.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar coverage for 2016 lidar acquisition of Cook & Tift County, GA.

Activity Log

Activity Log 1

CC ID: 623974
Activity Date/Time: 2016-08-24
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 623973
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: 717860
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 743846
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Horizontal Positional Accuracy:

Compiled to meet 1.18 feet (0.329 m) horizontal accuracy at 95 percent confidence level. Lidar system specifications are available in the project report.

Vertical Positional Accuracy:

LAS data covering the Tift Cook County task order was compared to independent survey control points to determine the FVA of the LAS Swath and of the Bare Earth DEM.

Raw LAS Swath Fundamental Vertical Accuracy (FVA)

Tested 0.329 feet fundamental vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using (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 theTIN using all points.

LAS Swath Fundamental Vertical Accuracy (FVA)

Tested 0.319 feet fundamental vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using (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 usingground points.

Bare-Earth DEM Fundamental Vertical Accuracy (FVA)

Fundamental Vertical Accuracy (FVA) tested 0.346 feet fundamental vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using (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.

Tall Grass Land Cover Classification Supplemental Vertical Accuracy (SVA)

Tested 0.562 feet supplemental vertical accuracy at the 95th percentile in the Tall Grass supplemental class reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the DEM.

Forested/Fully Grown Land Cover Classification Supplemental Vertical Accuracy (SVA)

Tested 0.597 feet 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.

Swamp Land Cover Classification Supplemental Vertical Accuracy (SVA)

Tested 0.758 feet supplemental vertical accuracy at the 95th percentile in the Swamp supplemental class reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the DEM.

Consolidated Vertical Accuracy (CVA)

Tested 0.598 feet 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

Process Steps

Process Step 1

CC ID: 623942
Description:

Using one Leica ALS80 (lidar) system on board a Cessna 404 Titan fixed-wing aircraft, lidar data, at a nominal pulse spacing (NPS) of 0.7 meters, was collected for this task order (approximately 515 square miles). AGL = 6500 feet - Aircraft Speed = 150 Knots, Field of View (Full) = 40 degrees, Pulse Rate = 545.0 kHz, Scan Rate = 51.0 Hz, with an average side lap of 25%. Multiple returns were recorded for each laser pulse along with an intensity value for each return. Two (2) missions were flown between February 14, 2016 and February 16, 2016. One (1) Global Navigation Satellite System (GNSS) Base Station was 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. Multiple returns were recorded for each laser pulse along with an intensity value for each return. The lidar data acquisition parameters for this mission are detailed in the lidar processing report for this task order. For all acquired lidar data as part of entire NOAA Lidar for Tift and Cook Counties, GA task order, the geoid used to reduce satellite derived elevations to orthometric heights was GEOID12B. Data for the task order is referenced to the State Plane Zone of Georgia West, North American Datum of 1983 (2011) US Feet, and NAVD88, in US Feet. 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 ALS80 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: 2016-02-14 00:00:00

Process Step 2

CC ID: 623943
Description:

The field crew utilized Real-Time Kinematic (RTK) GPS surveying throughout most of the ground control data collection process. For Tift-Cook Counties- Using RTK GPS techniques, observations were performed on a total of 17 LiDAR control points and 90 ground control quality 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.

Process Date/Time: 2015-03-17 00:00:00

Process Step 3

CC ID: 623944
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 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, 4 feet pixel size DEM files in ESRI Grid format, and Hydrologic Breakline, Flightline Vector, Tile Index, and Control Point data in ESRI Geodatabase format.

Process Date/Time: 2016-02-14 00:00:00

Process Step 4

CC ID: 623945
Description:

The first delivery of this dataset (August, 2015) to the NOAA Office for Coastal Management arrived via hard-drive device from Woolpert, the contracting the company for this project. An internal review from the CGSC data team at NOAA OCM generated a report with data concerns and alterations required before accepting the data as final. A second delivery arrived in March, 2016 which was subsequently reviewed again with feedback provided once again. In July of 2016, a final dataset delivered and accepted for distribution on the Digital Coast. The lidar data were projected to State Plane Georgia West (1002, in feet) and vertically to NAVD88 heights (in feet). OCM performed the following processing for data storage and Digital Coast provisioning purposes:

1. The pilot was only a small portion. The 2nd and 3rd deliveries included the entire project area. A cursory review was performed on the final tiles to insure all tiles meet specification before releasing to the public.

2. Erroneous points were removed and LAS files were compressed for data storage.

3. The data were converted from State Plane (ft) horizontal coordinates to geographic coordinates (decimal degrees) and vertical heights were converted from orthometric (NAVD88, ft) heights to ellipsoidal heights using Geoid12b (meters).

Process Date/Time: 2016-07-18 00:00:00

Catalog Details

Catalog Item ID: 48184
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-14 14:19+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2019-07-02 15:17+0000
Metadata Record Published: 2018-03-13
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2019-03-14