Short Citation:
Office for Coastal Management, 2021: 2012 Georgia Department of Natural Resources (DNR) Lidar: Baldwin, Hancock, Morgan, and Putnam Counties, https://www.fisheries.noaa.gov/inport/item/48182.

Item Identification

Title: 2012 Georgia Department of Natural Resources (DNR) Lidar: Baldwin, Hancock, Morgan, and Putnam Counties
Short Name: ga2012_gadnr_baldwin_hancock_morgan_putnam_m2619_metadata
Status: Completed
Publication Date: 2014-04
Abstract:

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 1.0 meter. The final products include full classified LAS, hydrologically flattened four (4) foot pixel raster DEM's of the bare earth

surface in IMG Format, and hydrologically flattened breaklines in gdb format. Links to the hydrologically flattened 4 foot pixel raster bare earth DEMs and

the hydrologically flattened breaklines are provided in the Supplemental Information section below.

This metadata record describes the classified LAS files. The classifications of lidar data available from the Digital Coast are:

1 Unclassified

2 Ground

7 Noise

9 Water

10 Ignored Ground

17 Overlap Unclassified

18 Overlap Ground

This lidar data set also includes lidar intensity values. 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.

This lidar data set covers 1455 sq miles in Baldwin, Hancock, Morgan, and Putnam counties in Georgia. The data were collected Dec 19, 22, 28, 30, 2012 and

January 4, 5, 2013.

The LiDAR data were collected to meet Fundamental Vertical Accuracy (FVA) Root Mean Square Error (RMSE) of 18.0 cm or better at a 95% confidence level,

so that when combined with breaklines, the data adequately supports the generation of two (2) foot FEMA compliant contours. The final LiDAR data were

delivered in 5,000 ft x 5,000 ft tiles using NAD 1983(2011), Georgia State Plane Coordinate System, West Zone, and expressed in US Survey Feet for Morgan

and Putnam Counties. The final LiDAR data was delivered in 5,000 ft x 5,000 ft tiles using NAD 1983(2011), Georgia State Plane Coordinate System, East Zone,

and expressed in US Survey Feet for Baldwin and Hancock Counties. The vertical datum used for this survey is North American Vertical Datum 1988 (NAVD88),

and expressed in US Survey Feet. Upon receipt of the data, the NOAA Office for Coastal Management (OCM) converted the data for Digital Coast storage purposes.

The data were converted to geographic coordinates and ellipsoid heights, expressed in meters.

Purpose:

This task order consisted of LiDAR data acquisition and processing for the National Oceanic and Atmospheric Administration's (NOAA) Office for Coastal Management

(OCM) four Counties in Georgia: Baldwin, Hancock, Morgan, and Putnam. The LiDAR data was collected to meet Fundamental Vertical

Accuracy (FVA) Root Mean Square Error (RMSE) of 18.0 cm or better at a 95% confidence level, so that when combined with breaklines, the data adequately

supports the generation of two (2) foot FEMA compliant contours.

Notes:

10205

Supplemental Information:

The final report for this data set may be viewed at:

https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2619/supplemental/ga2012_gadnr_baldwin_hancock_morgan_putnam_m2619_final_report.pdf

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

https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2619/supplemental/ga2012_gadnr_baldwin_hancock_morgan_putnam_m2619.kmz

The hydrologically flattened breaklines may be accessed here:

https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2619/breaklines/

The hydrologically flattened 4 foot pixel raser bare earth DEMs may be accessed here:

https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2619/dems/

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 Bathymetry/Topography
None elevation
None LAS
None Lidar
None Topography

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords Continent > North America > United States Of America > Georgia
None Baldwin County
None Georgia
None Hancock County
None Morgan County
None Putnam County
None United States

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: Map (digital)
Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility Woolpert, Inc, the National Oceanic and Atmospheric Administration (NOAA),

National Ocean Service (NOS), the Office for Coastal Management or its partners.

Support Roles

Data Steward

CC ID: 623879
Date Effective From: 2014-04
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: 623881
Date Effective From: 2014-04
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: 623882
Date Effective From: 2014-04
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: 623880
Date Effective From: 2014-04
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: 623890
W° Bound: -83.704424
E° Bound: -82.739281
N° Bound: 33.831072
S° Bound: 32.901943

Extent Group 1 / Time Frame 1

CC ID: 623884
Time Frame Type: Discrete
Start: 2012-12-19

Extent Group 1 / Time Frame 2

CC ID: 623885
Time Frame Type: Discrete
Start: 2012-12-22

Extent Group 1 / Time Frame 3

CC ID: 623886
Time Frame Type: Discrete
Start: 2012-12-28

Extent Group 1 / Time Frame 4

CC ID: 623887
Time Frame Type: Discrete
Start: 2012-12-30

Extent Group 1 / Time Frame 5

CC ID: 623888
Time Frame Type: Discrete
Start: 2013-01-04

Extent Group 1 / Time Frame 6

CC ID: 623889
Time Frame Type: Discrete
Start: 2013-01-05

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=2619

This data set is dynamically generated based on user-specified parameters.;

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: 743832
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2619
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: 743833
Download URL: https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2619
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 743835
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 743836
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 743837
URL: https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2619/supplemental/ga2012_gadnr_baldwin_hancock_morgan_putnam_m2619.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar coverage

Activity Log

Activity Log 1

CC ID: 623908
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 623907
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: 717858
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 743834
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Accuracy:

The LiDAR collected for this task order was collected to meet a Fundamental Vertical Accuracy (FVA) of NSSDA RMSEZ = 18cm (NSSDA AccuracyZ 95% = 30cm)

or better; assessment procedures to comply with FEMA, NSSDA, NDEP, and ASPRS guidelines. | Quantitative Value: 18 cm RMSE | Quantitative Test Explanation: Points measured will produce an error less than 18.0 cm RMSE.

Horizontal Positional Accuracy:

Horizontal accuracy is plus or minus 1.2 m (4 feet) at the 95% confidence level using RMSE(r) x 1.7308 when compared to the classified lidar as defined by the FGDC

Geospatial Positional Accuracy Standards, Part 3: NSSDA.; Quantitative Value: 1.2 meters, Test that produced the value: Horizontal accuracy is plus or minus 1.2 m (4 feet) at the 95% confidence level. LiDAR system calibration is

available in the project report. See link to the report in Supplemental Information field.

Vertical Positional Accuracy:

The LiDAR data vertical accuracy of the lidar bare earth point is 5.2 cm (0.17 feet) RMSE when compared to ground surveyed QA/QC points. The data

collected under this task Order meets the FEMA, NSSDA, NDEP, and ASPRS guidelines for accuracy standards. These 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). Twenty-Three (23) survey control points were surveyed

by Woolpert survey crews and used for lidar processing. Twenty-Two (22) control points were surveyed by Woolpert survey crews and used for

the independent survey control point accuracy reporting.

LAS Swath Fundamental Vertical Accuracy (FVA) Tested 10.1 cm (0.333 feet) fundamental vertical accuracy at a 95 percent confidence level, derived according

to NSSDA, in open terrain using (RMSEz) x 1.96000 tested against the TIN using independent check points.; Quantitative Value: 0.052 meters, Test that produced the value: Vertical Accuracy Statistics Morgan, Hancock, Putnam, and Baldwin:

Tested 10.1 cm (0.333 feet) fundamental vertical accuracy at 95 percent confidence level when compared to the classified lidar in open terrain using RMSE(z)

x 1.9600. RMSE in open terrain when compared to ground surveyed QA/QC points is 5.2 cm (0.17 feet)

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: 623867
Description:

Using an Optech Gemini LiDAR system, 142 flight lines of high density data, at a nominal pulse spacing (NPS) of 1.0 meter, were collected

over Morgan, Hancock, Putnam, and Baldwin Counties, GA (approximately 1455 square miles). Multiple returns were recorded for each laser pulse

along with an intensity value for each return. A total of thirteen (13) missions were flown on December 19, 22, 28, 30 in 2012 and January 4 and 5

in 2013. The geoid used to reduce satellite derived elevations to orthometric heights was GEOID12A. The horizontal datum used for this survey is NAD 1983

(2011), Georgia State Plane Coordinate System, West Zone, and expressed in US Survey Feet for Morgan and Putnam Counties. The horizontal datum used for

this survey is NAD 1983 (2011), Georgia State Plane Coordinate System, East Zone, and expressed in US Survey Feet for Baldwin and Hancock Counties. The

vertical datum used for this survey is North American Vertical Datum 1988 (NAVD88), and expressed in US Survey Feet. 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.

Process Date/Time: 2012-12-20 00:00:00

Process Step 2

CC ID: 623868
Description:

The Optech Gemini LiDAR system calibration and 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: 2012-01-01 00:00:00

Process Step 3

CC ID: 623869
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 task order.

Process Date/Time: 2012-12-20 00:00:00

Process Step 4

CC ID: 623870
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 homogenous 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), unclassified data (Class 1), 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 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: 2012-12-20 00:00:00

Process Step 5

CC ID: 623871
Description:

The NOAA Office for Coastal Management (OCM) received the files in las format. The files contained lidar elevation and intensity measurements.

The data were in Georgia State Plane coordinates, NAVD88 elevations, and US Survey feet vertical units. OCM performed the following processing

for data storage and Digital Coast provisioning purposes:

1. The data were converted from Georgia State Plane (Zones East (FIPs 1011) and West (FIPS 1002)) coordinates to geographic coordinates.

2. The data were converted from NAVD88 heights to ellipsoid elevations using Geoid12A.

3. The data were converted from US Survey Feet vertical units to meters vertical units.

4. The data were filtered for elevation outliers.

5. The data were zipped to laz format.

Process Date/Time: 2014-03-15 00:00:00

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity (ENT) las

Catalog Details

Catalog Item ID: 48182
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