2011 Georgia Lidar DEM: Burke Richmond Lincoln Columbia Counties
Data Set (DS) | Office for Coastal Management (OCM)GUID: gov.noaa.nmfs.inport:48375 | Updated: January 10, 2024 | Published / External
Summary
Short Citation
Office for Coastal Management, 2024: 2011 Georgia Lidar DEM: Burke Richmond Lincoln Columbia Counties, https://www.fisheries.noaa.gov/inport/item/48375.
Full Citation Examples
TASK NAME:4 GA Counties of Elevation Data
NOAA Contract No. EA133C11CQ0010
Requisition No. NCNP0000-11-02615
Woolpert Order No. 71511
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 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 ESRI Floating Point Grid Format (ArcGRID DEMs), and hydrologically flattened breaklines. Rasters were later convert to GeoTIFF format with vertical units of feet.
Original contact information:
Contact Org: National Oceanic and Atmospheric Administration (NOAA)
Title: Coastal Services Center
Phone: (843) 740-1200
Distribution Information
-
Create custom data files by choosing data area, product type, map projection, file format, datum, etc.
-
Simple download of data files.
No restrictions apply to this data.
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be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no Longer represent actual surface conditions.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 it's limitations. Acknowledgment of the Georgia Department of Natural Resources would be appreciated for products derived from these data. Acknowledgment of the NOAA Digital Coast for data distribution would also be appreciated.
Controlled Theme Keywords
COASTAL ELEVATION, elevation, TOPOGRAPHICAL RELIEF MAPS
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
-82.641278° W,
-81.540949° E,
33.982767° N,
32.797092° S
2011-02-26
Item Identification
Title: | 2011 Georgia Lidar DEM: Burke Richmond Lincoln Columbia Counties |
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Short Name: | ga2011_fourcounty_DEM_m5188 |
Status: | Completed |
Publication Date: | 2016-11-07 |
Abstract: |
TASK NAME:4 GA Counties of Elevation Data NOAA Contract No. EA133C11CQ0010 Requisition No. NCNP0000-11-02615 Woolpert Order No. 71511 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 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 ESRI Floating Point Grid Format (ArcGRID DEMs), and hydrologically flattened breaklines. Rasters were later convert to GeoTIFF format with vertical units of feet. Original contact information: Contact Org: National Oceanic and Atmospheric Administration (NOAA) Title: Coastal Services Center Phone: (843) 740-1200 |
Purpose: |
This task order consisted of LiDAR data acquisition and processing for the National Oceanic and Atmospheric Administration's (NOAA) Coastal Services Center (CSC). The area of interest for this task order are four Counties in Georgia; Burke, Columbia, Lincoln and Richmond. The LiDAR data acquisition and processing for Burke, Lincoln and Richmond County was performed in the Winter of 2011. The LiDAR data acquisition and processing for Columbia County was performed under a separate contract in the Spring of 2011. The LiDAR data was provided to NOAA CSC, as part of the 4 GA Counties of Elevation Data task order. The 4 GA Counties of Elevation Data task order AOI encompasses approximately 1739 square miles. The area of interest acquired and processed for Columbia County is approximately 353 square miles. The task order requires the LiDAR data to be collected at a nominal pulse spacing (NPS) of 1.0 meter. 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. The final LiDAR data was delivered in 5,000' x 5,000' tiles using North American Datum 1983, Georgia State Plane Coordinate System, East Zone, and expressed in US Survey Feet. |
Notes: |
11393 |
Supplemental Information: |
NOAA Contract No. EA133C11CQ0010 Requisition No. NCNP0000-11-02615 Woolpert Order No. 71511 CONTRACTOR: Woolpert, Inc. 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 discernible in the LiDAR data. |
Keywords
Theme Keywords
Thesaurus | Keyword |
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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 > COASTAL PROCESSES > COASTAL ELEVATION
|
ISO 19115 Topic Category |
elevation
|
Spatial Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Location Keywords |
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > GEORGIA
|
Physical Location
Organization: | Office for Coastal Management |
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City: | Charleston |
State/Province: | SC |
Data Set Information
Data Set Scope Code: | Data Set |
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Maintenance Frequency: | As Needed |
Data Presentation Form: | Image (digital) |
Distribution Liability: |
Any conclusions drawn from the analysis of this information are not the responsibility of Woolpert, Georgia DNR, the NOAA Office for Coastal Management, or their partners. |
Support Roles
Data Steward
Date Effective From: | 2016-11-07 |
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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
Date Effective From: | 2016-11-07 |
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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
Date Effective From: | 2016-11-07 |
---|---|
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
Date Effective From: | 2016-11-07 |
---|---|
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 |
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Extent Group 1
Extent Group 1 / Geographic Area 1
W° Bound: | -82.641278 | |
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E° Bound: | -81.540949 | |
N° Bound: | 33.982767 | |
S° Bound: | 32.797092 |
Extent Group 1 / Time Frame 1
Time Frame Type: | Discrete |
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Start: | 2011-02-26 |
Spatial Information
Spatial Representation
Representations Used
Grid: | Yes |
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Grid Representation 1
Dimension Count: | 3 | ||||
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Cell Geometry: | Point | ||||
Transformation Parameters Available?: | No | ||||
Axis Dimension 1 |
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Axis Dimension 2 |
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Axis Dimension 3 |
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Access Information
Security Class: | Unclassified |
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Data Access Procedure: |
This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=5188 |
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 it's limitations. Acknowledgment of the Georgia Department of Natural Resources would be appreciated for products derived from these data. Acknowledgment of the NOAA Digital Coast for data distribution would also be appreciated. |
Metadata Access Constraints: |
None. |
Metadata Use Constraints: |
None. |
Distribution Information
Distribution 1
Download URL: | https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=5188 |
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Distributor: | |
File Name: | Customized Download |
Description: |
Create custom data files by choosing data area, product type, map projection, file format, datum, etc. |
Distribution 2
Download URL: | https://noaa-nos-coastal-lidar-pds.s3.us-east-1.amazonaws.com/dem/GA_Burke_Richond_Lincoln_Columbia_2011_DEM_5188/index.html |
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Distributor: | |
File Name: | Bulk Download |
Description: |
Simple download of data files. |
URLs
URL 1
URL: | https://coast.noaa.gov/dataviewer |
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URL Type: |
Online Resource
|
URL 2
URL: | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12a/1389/supplemental/4GACountiesofElevation_NOAA_Final_Report_Jun2012.pdf |
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URL Type: |
Online Resource
|
Description: |
Link to the data set report. |
URL 3
URL: | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12a/1389/supplemental/2011_GADNR_Burke_Columbia_Lincoln_Richmond_Counties_Lidar.kmz |
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Name: | Browse Graphic |
URL Type: |
Browse Graphic
|
Description: |
Link to the data set footprint. |
Activity Log
Activity Log 1
Activity Date/Time: | 2016-11-07 |
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Description: |
Date that the source FGDC record was last modified. |
Activity Log 2
Activity Date/Time: | 2017-11-14 |
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Description: |
Converted from FGDC Content Standard 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
Activity Date/Time: | 2018-02-08 |
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Description: |
Partial upload of Positional Accuracy fields only. |
Activity Log 4
Activity Date/Time: | 2018-03-13 |
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Description: |
Partial upload to move data access links to Distribution Info. |
Issues
Issue 1
Issue Date: | 2018-05-04 |
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Author: | Waters, Kirk |
Issue: |
The hydroflattening appears faulty, at least for part of the data set. It appears as if void (such as lakes) were interpolated with a spline that extrapolated, causing pits and hills that don't really exist. |
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% = 36cm) or better; assessment procedures to comply with FEMA guidelines. | Quantitative Value: 18 cm RMSE | Quantitative Test Explanation: Points measured will produce an error less than 18.0 cm RMSE. Issues have been noted in the interpolation of lake surfaces. They are supposed to be hydroflattened, but there are lakes that have been extrapolated as either pits or domes. |
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Horizontal Positional Accuracy: |
Horizontal accuracy is +/- 4-foot (1.22 meters) at the 95% confidence level using RMSE(r) x 1.9600 as defined by the FGDC Geospatial Positional Accuracy Standards, Part 3: NSSDA. LiDAR system calibration is available in the project report. |
Vertical Positional Accuracy: |
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). For Columbia County, the LiDAR data vertical accuracy RMSE is 6.1 cm (0.20 ft). The Fundamental Vertical Accuracy (FVA) of the TIN: 11.96 cm (0.39 ft) at a 95% confidence level, derived according to NSSDA. For Burke, Richmond, and Lincoln Counties, the LiDAR data vertical accuracy RMSE is 5.3 cm (0.175 ft). The Fundamental Vertical Accuracy (FVA) of the TIN: 10.4 cm (0.34 ft) at a 95% confidence level, derived according to NSSDA. |
Completeness Measure: |
Cloud Cover: 0 |
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
Sources
4 GA Counties of Elevation Data
Publish Date: | 2011-08-31 |
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Extent Type: | Discrete |
Extent Start Date/Time: | 2011-12-13 |
Source Contribution: |
The LiDAR data collected for this task order. | Source Geospatial Form: raster digital data | Type of Source Media: disc |
Process Steps
Process Step 1
Description: |
Using an Optech Gemini LiDAR system, 44 flight lines of high density data, at a nominal pulse spacing (NPS) of 1.0 meter, were collected over Columbia County, GA (approximately 353 square miles). Multiple returns were recorded for each laser pulse along with an intensity value for each return. A total of three (3) missions were flown over a 24 hour period: February 26, 2011. The geoid used to reduce satellite derived elevations to orthometric heights was Geoid09. The horizontal datum used for this survey is North American Datum 1983, Georgia State Plane Coordinate System, East Zone, and expressed in US Survey Feet. 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. System Parameters: - Type of Scanner = Optech Gemini - Data Acquisition Height = 5,700-feet AGL - Scanner Field of View = 40 degrees - Scan Frequency = 29.5 Hertz - Pulse Repetition Rate - 100.0 Kilohertz - Aircraft Speed = 130 Knots - Swath Width = 4,149-feet - Number of Returns Per Pulse = Maximum of 4 - Distance Between Flight Lines = 2,701-feet |
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Process Date/Time: | 2011-02-26 00:00:00 |
Process Step 2
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. |
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Process Date/Time: | 2011-02-26 00:00:00 |
Process Step 3
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 project. |
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Process Date/Time: | 2011-03-02 00:00:00 |
Process Step 4
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 bare-earth points (Class 2), noise (Class 7), water (Class 9) ignored ground (Class 10), unclassified data (Class 1), and overlap points (Class 12). 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. |
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Process Date/Time: | 2011-03-05 00:00:00 |
Process Step 5
Description: |
Breaklines defining lakes, greater than two acres, and double-line streams, wider than 100 feet (30.5 meters), were compiled using digital photogrammetric techniques as part of the hydrographic flattening process and provided as ESRI Polyline Z and Polygon Z feature classes. 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 100 feet (30.5 meters), were compiled in the direction of flow with both sides of the stream maintaining an equal gradient elevation. The hydrologic flattening of the LiDAR data was performed for inclusion in the National Elevation Dataset (NED). |
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Process Date/Time: | 2011-07-20 00:00:00 |
Process Step 6
Description: |
Data received from Woolpert were converted from ArcGrid to GeoTIFF format using GDAL version 2.1.1 gdal_translate. The conversion of format was done to provide the data in an open format. |
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Process Date/Time: | 2016-11-07 00:00:00 |
Process Contact: | Office for Coastal Management (OCM) |
Catalog Details
Catalog Item ID: | 48375 |
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GUID: | gov.noaa.nmfs.inport:48375 |
Metadata Record Created By: | Anne Ball |
Metadata Record Created: | 2017-11-14 14:43+0000 |
Metadata Record Last Modified By: | Kirk Waters |
Metadata Record Last Modified: | 2024-01-10 18:53+0000 |
Metadata Record Published: | 2024-01-10 |
Owner Org: | OCM |
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 |