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Short Citation:
OCM Partners, 2023: North Carolina Statewide Lidar DEM 2015 Phase 3, https://www.fisheries.noaa.gov/inport/item/49413.

Item Identification

Title: North Carolina Statewide Lidar DEM 2015 Phase 3
Short Name: NorthCarolina_2015_DEM_Phase3_metadata_m6205
Status: Completed
Publication Date: 2017-01-15
Abstract:

Geographic Extent: North Carolina Area of Interest, covering approximately 7,197 square miles.

Dataset Description: The North Carolina LiDAR project called for the Planning, Acquisition, processing and derivative products of LIDAR data to be collected at a nominal pulse spacing (NPS) of 0.7 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LIDAR Specification, Version 1. The data was developed based on a horizontal projection/datum of North Carolina State Plane Coordinate System, NAD83, survey feet and vertical datum of NAVD1988 (GEOID12A), survey feet. LiDAR data was delivered in RAW flight line swath format, processed to create Classified LAS 1.4 Files formatted to 8026 individual 5000ft x 5000ft tiles, and corresponding Intensity Images and Bare Earth DEMs tiled to the same 5000ft x 5000ft schema, and Breaklines in ESRI File-Geodatabase format.

Ground Conditions: LiDAR was collected in Spring 2015, while no snow was on the ground and rivers were at or below normal levels. In order to post process the LiDAR data to meet task order specifications, Quantum Spatial established a total of 71 control points that were used to calibrate the LIDAR to known ground locations established throughout the North Carolina project area.

Upon receipt of the DEM data, NOAA converted from vertical feet to vertical meters to meet the standards of the Digital Coast Data Access Viewer.

Original contact information:

Contact Name: Jeff Simmons

Contact Org: Quantum Spatial, Inc., Data Acquisition Department

Phone: 859-277-8700

Email: jsimmons@quantumspatial.com

Purpose:

The purpose of this project was to update existing LiDAR data, originally collected between 2000 and 2005, with more accurate and clearly defined LiDAR data utilizing the latest in sensor technology. Although created for the North Carolina Floodplain Mapping Program for specific use in the engineering aspects of floodplain delineation, the data were also developed to address the elevation data requirements of the broader geospatial community. The North Carolina Floodplain Mapping Program was established in response to the extensive damage caused by Hurricane Floyd in 1999.

Notes:

12109

Supplemental Information:

CONTRACTOR: Quantum Spatial, Inc

Ground Control Points were acquired and calibrated by Quantum Spatial, Inc.

All Lidar data acquisition, calibration, and follow-on processing were completed by the prime contractor.

Please note the ldrinfo section has been repeated twice for the two different specifications used to acquire the data. However, the section is commented out in this xml file as the ldrinfo doesn't comply with the NOAA schema.

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 > COASTAL PROCESSES > COASTAL ELEVATION
UNCONTROLLED
ISO 19115 Topic Category elevation
None DEM
None Elevation data
None Hydrology
None LAS Point Cloud
None Lidar
None model
None remote sensing

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NORTH CAROLINA
UNCONTROLLED
None Alamance County
None Caswell County
None Chatham County
None Durham County
None Granville County
None Guilford County
None Harnett County
None Lee County
None North Carolina
None Orange County
None Person County
None Randolph County
None Rockingham County
None Wake County

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Data Presentation Form: Image (digital)
Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility

of Quantum Spatial, USGS, NOAA, or NCFMP.

Data Set Credit: Quantum Spatial, Inc. flew the LiDAR and processed the data.

Support Roles

Data Steward

CC ID: 661218
Date Effective From: 2017-01-15
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: 661220
Date Effective From: 2017-01-15
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: 661221
Date Effective From: 2017-01-15
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: 661219
Date Effective From: 2017-01-15
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: 661224
W° Bound: -80.07777422037
E° Bound: -78.24088713643
N° Bound: 36.55237387524
S° Bound: 35.17875523117

Extent Group 1 / Time Frame 1

CC ID: 661223
Time Frame Type: Range
Start: 2015-01-10
End: 2015-03-22

Spatial Information

Spatial Representation

Representations Used

Grid: 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=6205

This data was derived from a lidar point cloud that can be obtained at:

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=6209

;

Data Access Constraints:

No restrictions apply to these 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 U.S. Geological Survey and the North Carolina Floodplain Mapping Program would be appreciated for products derived from these data.

Metadata Access Constraints:

None.

Metadata Use Constraints:

None.

Distribution Information

Distribution 1

CC ID: 720748
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=6205
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: 720749
Download URL: https://coast.noaa.gov/htdata/raster2/elevation/NorthCarolina_DEM_2015P3_6205
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 720751
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 720752
URL: https://coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 661251
Activity Date/Time: 2017-01-06
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 661250
Activity Date/Time: 2017-11-14
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

CC ID: 718138
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 720750
Activity Date/Time: 2018-02-13
Description:

Partial upload to move data access links to Distribution Info.

Technical Environment

Description:

MicroStation Version 8; TerraScan Version 15; TerraModeler Version 15; GeoCue Version 2014.1.21.2; ESRI ArcGIS 10.2.2; Global Mapper 15.2; ALS Post Processor 2.75 Build #25; Leica Cloud Pro Version 1.2.1; Windows 7 Operating System \\psihq_nx3200\Projects\25481_NC_Lidar_2015\ 794 GB and \\Matrix\LIDAR\25481_NC_LiDAR_2015\ 8.37 TB

Data Quality

Vertical Positional Accuracy:

The specifications require that only Nonvegetated Vertical Accuracy (NVA) be computed for raw lidar point cloud swath files. The vertical accuracy was tested with 148 independent survey located in open terrain. These check points (check points) were not used in the calibration or post processing of the lidar point cloud data. The survey check points were distributed throughout the project. Specifications for this project require that the NVA be 19.6 cm or better AccuracyZ at 95 percent confidence level.; Quantitative Value: 0.074 meters, Test that produced the value: The NVA was tested using 148 independent surveys located in open terrain. The survey check points were distributed throughout the project area. The 148 independent check points were surveyed using the closed level loop technique. Elevations from the unclassified lidar surface were measured for the x,y location of each check point. Elevations interpolated from the lidar surface were then compared to the elevation values of the surveyed control. The RMSE was computed to be 0.124 feet. AccuracyZ has been tested to meet 19.6 cm Nonvegetated Vertical Accuracy at 95 percent confidence level using (RMSEz * 1.9600) as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines. AccuracyZ in meters is 0.074.

Completeness Report:

Datasets contain complete coverage of tiles.

No points have been removed or excluded.

A visual qualitative assessment was performed to ensure data completeness.

There are no void areas or missing data. The raw point cloud is of good quality and data passes Non-Vegetated Vertical Accuracy specifications.

Conceptual Consistency:

Classified LAS files were tested by Quantum Spatial for both vertical and horizontal accuracy. All data is seamless from one tile to the next, no gaps or no data areas.

Lineage

Sources

Lidar RAW Data for North Carolina 2015

CC ID: 661204
Contact Name: Quantum Spatial, Inc.
Publish Date: 2015-01-01
Extent Type: Range
Extent Start Date/Time: 2015-01-10
Extent End Date/Time: 2015-03-22
Source Contribution:

This data source was used to populate the lidar point cloud data. | Source Geospatial Form: lidar data | Type of Source Media: online

Survey Report of LiDAR Ground Control Points: North Carolina 2015 LiDAR

CC ID: 661202
Contact Name: Quantum Spatial, Inc.
Publish Date: 2015-01-01
Extent Type: Discrete
Extent Start Date/Time: 2015
Source Contribution:

This data source was used (along with the airborne GPS/IMU Data) to aid in the georeferencing of the lidar point cloud data.

| Source Geospatial Form: vector digital data and tabular data | Type of Source Media: CD-ROM

Survey Report of LiDAR Quality Control Points: North Carolina 2015 LiDAR

CC ID: 661203
Contact Name: Quantum Spatial, Inc.
Publish Date: 2015-01-01
Extent Type: Discrete
Extent Start Date/Time: 2015
Scale Denominator: 50
Source Contribution:

This data source was used (along with the lidar intensity imagery) to QC and vertically adjust the lidar point cloud data. | Source Geospatial Form: vector digital data and tabular data | Type of Source Media: online

Process Steps

Process Step 1

CC ID: 661205
Description:

Lidar Pre-Processing: Airborne GPS and IMU data were merged to develop a Single Best Estimate (SBET) of the lidar system trajectory for each lift. Lidar ranging data were initially calibrated using previous best parameters for this instrument and aircraft. Relative calibration was evaluated using advanced plane-matching analysis and parameter corrections derived. This was repeated iteratively until residual errors between overlapping swaths, across all project lifts, was reduced to acceptable levels. Data were then block adjusted to match surveyed calibration control. Raw data NVA were checked using independently surveyed checkpoints. Swath overage points were identified and tagged within each swath file. The results of the final calibration, NVA and horizontal accuracy assessments, and the "raw" swaths were forwarded to the client to obtain a Notice To Proceed on classification and derivative product generation.

Process Date/Time: 2015-01-01 00:00:00
Source: Survey Report of LiDAR Ground Control Points: North Carolina 2015 LiDAR

Process Step 2

CC ID: 661206
Description:

Lidar Post-Processing: The calibrated and controlled lidar swaths were processed using automatic point classification routines in proprietary software. These routines operate against the entire collection (all swaths, all lifts), eliminating character differences between files. Data were then distributed as virtual tiles to experienced lidar analysts for localized automatic classification, manual editing, and peer-based QC checks. 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.

All classification tags are stored in the original swath files.

After completion of classification and final QC approval, the NVA and VVA for the project are calculated. Sample areas for each land cover type present in the project area were extracted and forwarded to the client, along with the results of the accuracy tests. Upon acceptance, the complete classified lidar swath files were delivered to the client. | Source Produced: Lidar RAW Data for North Carolina 2015

Process Date/Time: 2015-01-01 00:00:00
Source: Survey Report of LiDAR Ground Control Points: North Carolina 2015 LiDAR

Process Step 3

CC ID: 661207
Description:

Classified LAS Processing: The bare earth surface is then manually reviewed to ensure correct classification on the Class 2 (Ground) points. After the bare-earth surface is finalized, it is then used to generate all hydro-breaklines through heads-up digitization.

All ground (ASPRS Class 2) LiDAR data inside of the Lake Pond and Double Line Drain hydro flattening breaklines were then classified to water (ASPRS Class 9) using TerraScan macro functionality. A buffer of 3 feet was also used around each hydro-flattened feature to classify these ground (ASPRS Class 2) points to Ignored ground (ASPRS Class 10). All Lake Pond Island and Double Line Drain Island features were checked to ensure that the ground (ASPRS Class 2) points were reclassified to the correct classification after the automated classification was completed.

All overlap data was processed through automated functionality provided by TerraScan to classify the overlapping flight line data to approved classes by USGS. The overlap data was classified to Class 1 using the Overlap Classification Bit and Class 2 using the Overlap Classification Bit. These classes were created through automated processes only and were not verified for classification accuracy.

All data was manually reviewed and any remaining artifacts removed using functionality provided by TerraScan and TerraModeler. Global Mapper was used as a final check of the bare earth dataset. GeoCue was then used to create the deliverable industry-standard LAS files for both the All Point Cloud Data and the Bare Earth. Quantum Spatial proprietary software was used to perform final statistical analysis of the classes in the LAS files, on a per tile level to verify final classification metrics and full LAS header information.

Process Date/Time: 2015-01-01 00:00:00
Source: Survey Report of LiDAR Ground Control Points: North Carolina 2015 LiDAR

Process Step 4

CC ID: 661208
Description:

Hydro Flattening Breakline Processing:

Class 2 LiDAR was used to create a bare earth surface model. The surface model was then used to heads-up digitize 2D breaklines of inland streams and rivers with a 100 foot nominal width and Inland Ponds and Lakes of 2 acres or greater surface area.

Elevation values were assigned to all Inland Ponds and Lakes, Inland Pond and Lake Islands, Inland Stream and River Islands, using TerraModeler functionality.

Elevation values were assigned to all Inland streams and rivers using Quantum Spatial proprietary software.

All ground (ASPRS Class 2) LiDAR data inside of the collected inland breaklines were then classified to water (ASPRS Class 9) using TerraScan macro functionality. A buffer of 3 feet was also used around each hydro-flattened feature. These points were moved from ground (ASPRS Class 2) to Ignored Ground (ASPRS Class 10).

The breakline files were then translated to ESRI File-Geodatabase format using ESRI conversion tools.

Process Date/Time: 2015-01-01 00:00:00
Source: Survey Report of LiDAR Ground Control Points: North Carolina 2015 LiDAR

Process Step 5

CC ID: 661209
Description:

Intensity Image Generation Process: GeoCue software was used to create the deliverable Intensity Images. All overlap classes (using Overlap Classification Bit) were ignored during this process. This helps to ensure a more aesthetically pleasing image.

The GeoCue software was then used to verify full project coverage as well. TIF/TWF files were then provided as the deliverable for this dataset requirement.

Process Date/Time: 2015-01-01 00:00:00
Source: Survey Report of LiDAR Ground Control Points: North Carolina 2015 LiDAR

Process Step 6

CC ID: 661210
Description:

Ingestion into NOAA Digital Coast Data Access Viewer:

Data were received from the North Carolina Flood Plain Mapping Program as a 3 foot Raster DEM in ERDAS Imagine format. The format was changed to GeoTIFF and georeferencing added to indicate the vertical units are feet.

Process Date/Time: 2017-01-05 00:00:00

Catalog Details

Catalog Item ID: 49413
GUID: gov.noaa.nmfs.inport:49413
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:13+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2018-02-13
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2018-02-13
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2019-02-13