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Short Citation:
OCM Partners, 2024: 2013 South Carolina DNR Lidar: Beaufort County,

Item Identification

Title: 2013 South Carolina DNR Lidar: Beaufort County
Short Name: sc2013_scdnr_beaufort_m5104_metadata
Status: Completed
Publication Date: 2013-08

LMSI provided high accuracy, calibrated multiple return LiDAR for roughly 785 square miles covering Beaufort County, South Carolina. The nominal point spacing for this project was at least 4 points per square meter. Dewberry used proprietary procedures to classify the LAS according to project specifications: 1-Unclassified, 2-Ground, 7-Noise, 8-Model Key Points, 9-Water, 10-Ignored Ground, 11-Withheld Points, 13-Bridges and Culverts. Dewberry produced 3D breaklines and combined these with the final LiDAR data to produce seamless hydro-enforced DEMs for the 982 tiles (5000 ft x 5000 ft) that cover the project area.


The purpose of this LiDAR data was to produce high accuracy 3D elevation products, including tiled LiDAR in LAS 1.2 format, 3D breaklines, and 5 ft cell size hydro-enforced Digital Elevation Models (DEMs).



Supplemental Information:

A complete description of this dataset is available in the Final Project Report submitted to the SC Dept of Natural Resources.

A delivery report for this project is available at:

A lidar report for this project is available at:

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


Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category

Temporal Keywords

Thesaurus Keyword
None 2013

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: las
Entity Attribute Overview:

LAS 1.2 format (Classes 1,2,7,8,9,10,15,17)

Entity Attribute Detail Citation:


Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of Towill Inc., Dewberry, SC DNR, NOAA, the Office for Coastal Management or its partners.

Support Roles

Data Steward

CC ID: 686318
Date Effective From: 2013-08
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


CC ID: 686320
Date Effective From: 2013-08
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Metadata Contact

CC ID: 686321
Date Effective From: 2013-08
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Point of Contact

CC ID: 686319
Date Effective From: 2013-08
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1138151
W° Bound: -81.019529
E° Bound: -80.401518
N° Bound: 32.707084
S° Bound: 32.072336

Extent Group 1 / Time Frame 1

CC ID: 1138150
Time Frame Type: Range
Start: 2013-07-01
End: 2013-08-30

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:

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

Data Access Constraints:


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. These data depict the heights at the time of the survey and are only accurate for that time.

Distribution Information

Distribution 1

CC ID: 742530
Download URL:
File Name: Customized Download

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

Distribution 2

CC ID: 742531
Download URL:
File Name: Bulk Download

Simple download of data files.



CC ID: 742533
URL Type:
Online Resource


CC ID: 742535
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz

This graphic shows the lidar coverage for the 2013 lidar project covering Beaufort County, South Carolina.


CC ID: 857916
Name: breaklines
URL Type:
Online Resource
File Resource Format: zip

Breaklines in zipped geodatabase format as delivered. These have not been checked for accuracy by NOAA.


CC ID: 857917
Name: Project report
URL Type:
Online Resource
File Resource Format: pdf

Project report produced by Dewberry (prime contractor)


CC ID: 857918
Name: Breaklines GPKG
URL Type:
Online Resource
File Resource Format:

Breaklines in GeoPackage format created from the GeoDatabase version using ogr2ogr.

Activity Log

Activity Log 1

CC ID: 686337
Activity Date/Time: 2016-10-17

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 686336
Activity Date/Time: 2017-11-14

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using '' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 718600
Activity Date/Time: 2018-02-08

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 742532
Activity Date/Time: 2018-03-13

Partial upload to move data access links to Distribution Info.

Data Quality

Horizontal Positional Accuracy:

Lidar source compiled to meet 1 m horizontal RMSE.; Quantitative Value: 1.0 meters, Test that produced the value: Dewberry does not perform independent horizontal accuracy testing on the LiDAR. LiDAR vendors perform calibrations on the LiDAR sensor and compare data to adjoining flight lines to ensure LiDAR meets the 1 m horizontal accuracy standard at the 95% confidence level. Please see the final project report for more details.

Vertical Positional Accuracy:

The vertical accuracy of the LiDAR was not tested by Dewberry. SC Dept of Natural Resources will contract for an independent quality review and accuracy assessment study of the elevation data and products generated for this project.; Quantitative Value: 0.06 meters, Test that produced the value: Dewberry does not perform independent horizontal accuracy testing on the LiDAR. LiDAR vendors perform calibrations on the LiDAR sensor and compare data to adjoing flight lines to ensure LiDAR meets the 0.6 meter horizontal accuracy standard at the 95% confidence level.

Completeness Report:

A visual qualitative assessment was performed to ensure data completeness and bare earth data cleanliness. No void or missing data, the bare earth surface is of good quality and data passes vertical accuracy specifications.

Conceptual Consistency:

Data covers the tile scheme provided for the project area.


Process Steps

Process Step 1

CC ID: 1138146

Data for the South Carolina Dept of Natural Resources project was acquired by Laser Mapping Specialist, Inc. (LMSI)

The project area included approximately 785 contiguous square miles for Beaufort County, South Carolina.

The data was delivered in the South Carolina State Plane (International Feet) coordinate system, horizontal datum NAD83 (NSRS 2007), vertical datum NAVD88, Geoid 09, Feet.

Lidar ground points for each flightline generated by an automatic classification routine are used.

LiDAR sensor data were collected with the Optech ALTM3100EA LiDAR system. No imagery was requested or delivered.

Deliverables for the project included a raw (unclassified) calibrated LiDAR point cloud, survey control, and a final control report.

Overall the LiDAR data products collected by LMSI meet or exceed the requirements set out in the Statement of Work.

The quality control requirements of LMSIs quality management program were adhered to throughout the acquisition stage of this project to ensure product quality.

LIDAR acquisition began on March 6, 2013 (julian day 065) and was completed on April 20, 2013 (julian day 079). A total of 16 survey missions were flown to complete the project.

The flight plan was flown as planned with no modifications. There were no unusual occurrences during the acquisition and the sensor performed within specifications. There were 203 flight lines required to complete the project.

Project coverage was checked on site with no data gaps except for water features.

Two base stations were utilized. The base station in the north west portion of the project was named G7_203. The base station on the central portion of the project was named GG.

Thirty (30) static points were surveyed at various locations throughout the project to be utilized for quality control and adjustment of the LiDAR data. All airborne trajectories were very high quality with forward/reverse separation between 2cm-5cm.

All equipment performed within specifications with no unusual occurances or anamolies. All data was of a very high quality and the project was executed as planned.

Process Date/Time: 2013-03-06 00:00:00

Process Step 2

CC ID: 1138147

Dewberry utilizes a variety of software suites for inventory management, classification, and data processing. All LiDAR related processes begin by importing the data into the GeoCue task management software. The swath data is tiled according to project specifications (5000 ft x 5000 ft). The tiled data is then opened in Terrascan where Dewberry uses proprietary ground classification routines to remove any non-ground points and generate an accurate ground surface. Before the actual ground routine is run points with scan angles greater than plus or minus 18 degrees are classified to class 11, withheld. Due to these higher scan angles these points have the potential to introduce issues into the ground and are therefore not used in the final ground surface. The ground routine consists of three main parameters (building size, iteration angle, and iteration distance); by adjusting these parameters and running several iterations of this routine an initial ground surface is developed. The building size parameter sets a roaming window size. Each tile is loaded with neighboring points from adjacent tiles and the routine classifies the data section by section based on this roaming window size. The second most important parameter is the maximum terrain angle, which sets the highest allowed terrain angle within the model. Once the ground routine has been completed a manual quality control routine is done using hillshades, cross-sections, and profiles within the Terrasolid software suite. After this QC step, a peer review and supervisor manual inspection is completed on a percentage of the classified tiles based on the project size and variability of the terrain. After the ground classification corrections were completed, the dataset was processed through a water classification routine that utilizes breaklines compiled by Dewberry to automatically classify hydrographic features. The water classification routine selects ground points within the breakline polygons and automatically classifies them as class 9, water. During this water classification routine, points that are within 1 foot of the hydrographic features are moved to class 10, an ignored ground due to breakline proximity.

The fully classified dataset is then processed through Dewberry's comprehensive quality control program.

The data was classified as follows:

Class 1 = Unclassified. This class includes vegetation, buildings, noise etc.

Class 2 = Ground

Class 7 = Noise

Class 8 = Model Key Points

Class 9 = Water

Class 10 = Ignored

Class 11 = Withheld Points

Class 13 = Bridges and Culverts

The LAS header information was verified to contain the following:

Class (Integer)

Adjusted GPS Time (0.000001 seconds)

Easting (0.001 ft)

Northing (0.001 ft)

Elevation (0.001 ft)

Echo Number (Integer 1 to 4)

Echo (Integer 1 to 4)

Intensity (8 bit integer)

Flight Line (Integer)

Scan Angle (Integer degree)

Process Date/Time: 2013-07-01 00:00:00

Process Step 3

CC ID: 1138148

The NOAA Office for Coastal Management (OCM) received the files in LAZ format from the South Carolina Department of Natural Resources (SCDNR) via a HDD. The files contained lidar elevation and intensity measurements. The data were in State Plane Zone 3900, NAVD88 (orthometric) heights in feet. OCM performed the following processing for data storage and Digital Coast provisioning purposes:

1. The data were converted from State Plane coordinates to geographic coordinates.

2. The data were converted from NAVD88 (orthometric) heights in meters to GRS80 (ellipsoid) heights in meters using Geoid 09.

3. Classes 11 and 13 were reclassified to 15 to 17 respectively.

4. Erroneous elevations were removed.

Process Date/Time: 2015-10-01 00:00:00

Related Items

Item Type Relationship Type Title
Data Set (DS) Cross Reference 2013 South Carolina DNR Lidar DEM: Beaufort County

The Hydroflattened DEM made from this lidar point data

Catalog Details

Catalog Item ID: 49999
GUID: gov.noaa.nmfs.inport:49999
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:23+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+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