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Short Citation:
OCM Partners, 2022: 2001 NCFMP Lidar: Phase 1B (Cape Fear and Lumber River Basins), https://www.fisheries.noaa.gov/inport/item/49831.

Item Identification

Title: 2001 NCFMP Lidar: Phase 1B (Cape Fear and Lumber River Basins)
Short Name: nc2001_phase1b_m1399
Status: Completed
Publication Date: 2012-12
Abstract:

This airborne LiDAR terrain mapping data was acquired in the spring of 2001. The data were collected for the floodplain mapping program for the state of North Carolina. The data were collected for the state in three phases: 1, 2, and 3. This metadata record describes that data that were in phase 1 of collection and fall within the Cape Fear and Lumber River Basins in central and eastern North Carolina. This area consists of 30 counties which are listed below in the Place Keywords field.

The data were received by the NOAA Office for Coastal Management from the U.S. Geological Survey (USGS) Center for Lidar Coordination and Knowledge (CLICK). For data storage and Digital Coast provisioning purposes, the OCM converted the data to geographic coordinates and ellipsoid (Geoid99) elevations. The data are unclassified.

Purpose:

These data were collected and derived by the North Carolina Floodplain Mapping Program (www.ncfloodmaps.com) as part of its effort to modernize FEMA Flood Insurance Rate Maps (FIRM) statewide. Although created 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 data user community. The North Carolina Floodplain Mapping Program was established in response to the extensive damage caused by Hurricane Floyd in 1999.

Notes:

10475

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None Contour
None Flood
None Floodplain
None Full return
None Raw

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: Unknown
Entity Attribute Overview:

Files in LAZ format (classified as 1, unclassified)

Entity Attribute Detail Citation:

none

Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of NC Floodplain Mapping Program,

Greenhorne & O'Mara, Inc., the NOAA Office for Coastal Management, or its partners.

Data Set Credit: Acknowledgement of the North Carolina Floodplain Mapping Program is appreciated when using the data set. This data set was developed for the North Carolina Floodplain Mapping Program by Greenhorne & O'Mara, Inc. Additional data development support was provided by 3Di Technologies, Inc. as subcontractor to Greenhorne & O'Mara and by Airborne1 Corp. and Sanborn Colorado, LLC as sub-tier suppliers to 3Di.

Support Roles

Data Steward

CC ID: 679285
Date Effective From: 2012-12
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: 679287
Date Effective From: 2012-12
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: 679288
Date Effective From: 2012-12
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: 679286
Date Effective From: 2012-12
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: 1133099
W° Bound: -80.062511
E° Bound: -77.43749
N° Bound: 36.375656
S° Bound: 33.81882

Extent Group 1 / Time Frame 1

CC ID: 1133098
Time Frame Type: Range
Start: 2001-01-03
End: 2001-03-23

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=1399

;

Data Access Constraints:

None

Data Use Constraints:

Users should be aware that temporal changes may have occurred since this data set was collected and that 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: 741593
Start Date: 2012
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1399
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2012-12 - Present)
File Name: Customized Download
Description:

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

File Type: Zip

Distribution 2

CC ID: 741594
Start Date: 2012
End Date: Present
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1399/index.html
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2012-12 - Present)
File Name: Bulk Download
Description:

Simple download of data files in LAZ format

File Type: LAZ

URLs

URL 1

CC ID: 741596
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 741598
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1399/supplemental/nc2001_ncfmp_phase1b_m1399.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar coverage for the Cape Fear and Lumber River Basins in Phase 1 of the North Carolina statewide lidar collection.

Activity Log

Activity Log 1

CC ID: 679343
Activity Date/Time: 2016-10-25
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 679342
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: 718404
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 741595
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Accuracy:

LIDAR Bare Earth data were compared with NCGS QA/QC checkpoints. The 5% of points with the largest error were removed (outliers). For

the NC Floodplain Mapping Program, the vertical accuracy for coastal counties is less than or equal to 20 cm RMSE.

For mainland counties, the vertical accuracy of the elevation data is less than or equal to 25 cm RMSE. More information about the

| Quantitative Value:

Total accuracy (all land cover types): Information on accuracy is contained in the Cape Fear and Lumber River Basin Final Reports.

Accuracy by land cover type: Information on accuracy is contained in the county reports, which may be viewed at:

http://portal.ncdenr.org/web/lr/geodetic/floodplaininfo.

| Quantitative Test Explanation:

State QAQC points measured by the NCGS were compared to interpolated TIN values for the LIDAR data sets. The difference was

calculated as the QAQC value minus the LIDAR interpolated TIN value. The differences were then squared and summed. The resulting

value was divided by the number of points compared to determine the mean. The square root of the mean was calculated to arrive

at the Root Mean Square Error (RMSE) of the elevation differences, or RMSE(z). Additional information on accuracy is contained in

the county reports, which may be viewed at: http://portal.ncdenr.org/web/lr/geodetic/floodplaininfo.

Horizontal Positional Accuracy:

See Cape Fear and Lumber River Basin Final Reports.; Quantitative Value: 1.0 meters, Test that produced the value:

Horizontal Accuracy is derived from the total error budget of the LIDAR Sensor and the Post Processed GPS Kinematic solution.

Error budgets and calibration values have been established that include GPS error of the aircraft location in space during flight,

the angular error of the Inertial Measurement Unit resulting in error budget for aircraft platform attitude in pitch, roll and yaw,

and the angular error in the LIDAR scan mirror position for each laser shot. These and other minor error budgets are used to derive

the maximum horizontal position error of the LIDAR footprint on the terrain surface. Performance against this budget is checked

with laboratory measurements and flight calibrations to assure conformance to specification. Further information on calibration

reports can be obtained in these reports, available at: http://portal.ncdenr.org/web/lr/geodetic/floodplaininfo.

Vertical Positional Accuracy:

See Cape Fear and Lumber River Basin Final Reports.; Quantitative Value: 0.2 meters, Test that produced the value:

Internally collected QAQC points and qualified NGS Benchmarks were compared to interpolated TIN values for the LIDAR data sets.

The difference was calculated as the QAQC value minus the LIDAR interpolated TIN value. The differences were then squared and

summed. The resulting value was divided by the number of points compared to determine the mean. The square root of the mean was

calculated to arrive at the Root Mean Square Error (RMSE) of the elevation differences, or RMSE(z). Acceptable values for RMSE

would be 20cm or less for designated coastal counties and 25cm for inland counties. The county reports which have the county

RMSE value are available at: http://portal.ncdenr.org/web/lr/geodetic/floodplaininfo.

Completeness Report:

Not provided

Conceptual Consistency:

Proprietary algorithms exclude any points taken with Positional Dilution of Precision Values greater than 3; algorithms also exclude

anomalous points (extremely high or extremely low values compared to the surrounding points).

Lineage

Process Steps

Process Step 1

CC ID: 1133094
Description:

Production Narrative: Data collected were processed to determine that valid GPS values were achieved on all flights.

The flight data was processed using proprietary automated algorithms that calculate the x, y, and z value of each point by

combining GPS position of the aircraft, IMU attitude of the aircraft, range of the laser pulse, and scan angle of the

laser scanner. Resulting data from each flight line was then compared to crossing and bordering flight lines to identify

any residual pitch, roll or yaw errors. Data were also compared to calibration flights over airports in or adjacent to the

Cape Fear and Lumber River Basins. Data were then edited in TerraModel by comparing contour lines, shaded relief models (hillshading)

and points clouds within tiles and from one tile to the next. Finally, the data were compared to available ground survey

data prior to submitting to the State for QAQC checks.

Process Date/Time: 2002-05-31 00:00:00

Process Step 2

CC ID: 1133095
Description:

Lidar points were supplied to the USGS EROS Center. Points received in a file format other than LAS were converted to LAS,

if the data contained adequate attribute information to create a valid LAS file and without the loss of any original attribute

information. The points have been re-tiled into a standard Quarter-Quad, or Quarter-Quarter-Quad, scheme for publication

on the CLICK website. The data remain in the Coordinate Reference System in which they were received. No alteration of any sort,

of either the geometry or attribute values or structure has been performed.

Process Date/Time: 2008-01-01 00:00:00

Process Step 3

CC ID: 1133096
Description:

The lidar point data were received by the NOAA Office for Coastal Management from the USGS Center for Lidar Coordination and Knowledge (CLICK)

in las format. The files contained lidar elevation and intensity measurements. The data were unclassified, in State Plane coordinates,

and were vertically referenced to NAVD88. 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 orthometric (NAVD88) heights to ellipsoidal heights using Geoid99.

3. The data were sorted by time and laszipped.

Process Date/Time: 2012-12-01 00:00:00

Catalog Details

Catalog Item ID: 49831
GUID: gov.noaa.nmfs.inport:49831
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:22+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