2012 Georgia Department of Natural Resources (DNR) Lidar: Baldwin, Hancock, Morgan, and Putnam Counties

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.

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.

10205

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2619/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://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2619/supplemental/ga2012_gadnr_baldwin_hancock_morgan_putnam_m2619.kmz

The hydrologically flattened breaklines may be accessed here:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2619/breaklines/

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2619/dems/

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.

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.;

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.

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 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.

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)

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.