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Short Citation:
OCM Partners, 2023: 2016 USGS Lidar DEM: Assateague Island, Maryland and Virginia, Post-Hurricane Hermine, 10-12 September 2016, https://www.fisheries.noaa.gov/inport/item/56742.

Item Identification

Title: 2016 USGS Lidar DEM: Assateague Island, Maryland and Virginia, Post-Hurricane Hermine, 10-12 September 2016
Short Name: 2016 hermine dem m8774
Status: Completed
Publication Date: 2017-03-24
Abstract:

A digital elevation model (DEM) mosaic was produced for Assateague Island, Maryland and Virginia, post-Hurricane Hermine, from remotely sensed, geographically referenced elevation measurements collected by Quantum Spatial using a Riegl VQ-880-G (532-nm wavelength circular scan and 1064-nm wavelength linear scan) lidar sensor.

Purpose:

The purpose of this project was to produce a highly detailed and accurate digital elevation map for Assateague Island, Maryland and Virginia for use as a management tool and to make these data available to natural-resource managers and research scientists. To ensure that SPCMSC data management protocols were followed, this survey was assigned a USGS field activity number (FAN), 16CNT03. Additional survey and data details are available at http://cmgds.marine.usgs.gov/fan_info.php?fan=16CNT03. USGS Contract: G16PC00016 Task Order Number: G16D01063

Supplemental Information:

Processed data products are used by the U.S. Geological Survey CMGP's National Assessment of Coastal Change Hazards project to quantify the vulnerability of shorelines to coastal change hazards such as severe storms, sea-level rise, and shoreline erosion and retreat.

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > SEAFLOOR TOPOGRAPHY
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION
ISO 19115 Topic Category
elevation
UNCONTROLLED
Global Change Master Science Directory DOI/USGS/CMG > COASTAL AND MARINE GEOLOGY, U.S. GEOLOGICAL SURVEY, U.S. DEPARTMENT OF INTERIOR
Global Change Master Science Directory OCEAN > COASTAL PROCESSES > BARRIER ISLANDS
Global Change Master Science Directory OCEAN > COASTAL PROCESSES > BEACHES
Global Change Master Science Directory OCEAN > COASTAL PROCESSES > SHORELINE DISPLACEMENT
None Cessna Caravan
None DEM
None extratropical cyclone
None shoreline

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > LAND SURFACE
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > SEA FLOOR
UNCONTROLLED
Geographic Names Information System Assateague Island
Geographic Names Information System Delmarva Peninsula
Geographic Names Information System Maryland
Geographic Names Information System United States
Geographic Names Information System Virginia

Instrument Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Instrument Keywords
LIDAR > Light Detection and Ranging
UNCONTROLLED
Global Change Master Directory (GCMD) Instrument Keywords Earth Remote Sensing Instruments > Active Remote Sensing > Profilers/Sounders > Lidar/Laser Sounders > LIDAR > Light Detection and Ranging

Platform Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Platform Keywords
AIRCRAFT
Global Change Master Directory (GCMD) Platform Keywords
DEM > Digital Elevation Model

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Elevation
Maintenance Frequency: None Planned
Data Presentation Form: raster digital data
Distribution Liability:

Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners

Data Set Credit: Acknowledgment of the U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected. Sharing of new data layers developed directly from these data would also be appreciated by the U.S. Geological Survey staff. Users should be aware that comparisons with other datasets for the same area from other periods may be inaccurate because of inconsistencies resulting from changes in photointerpretation, mapping conventions, and digital processes over time. These data are not legal documents and are not to be used as such., U.S. Geological Survey

Support Roles

Data Steward

CC ID: 857410
Date Effective From: 2019-06-25
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: 857411
Date Effective From: 2019-06-25
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: 857412
Date Effective From: 2019-06-25
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: 857413
Date Effective From: 2019-06-25
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: 1152831
W° Bound: -75.40368708
E° Bound: -75.08583525
N° Bound: 38.32613127
S° Bound: 37.84866877

Extent Group 1 / Time Frame 1

CC ID: 1152830
Time Frame Type: Range
Start: 2016-09-10
End: 2016-09-12

Spatial Information

Spatial Representation

Grid Representation 1

CC ID: 857455
Dimension Count: 2
Cell Geometry: Point
Transformation Parameters Available?: Yes

Axis Dimension 1

Dimension Type: Row
Size: 27735
Resolution Type: Distance
Resolution: 1.0 Meter

Axis Dimension 2

Dimension Type: Column
Size: 52905
Resolution Type: Distance
Resolution: 1.0 Meter

Reference Systems

Reference System 1

CC ID: 1152828

Coordinate Reference System

CRS Type: Vertical
EPSG Code: EPSG:5703
EPSG Name: NAVD88 height
See Full Coordinate Reference System Information

Reference System 2

CC ID: 1152827

Coordinate Reference System

CRS Type: Projected
EPSG Code: EPSG:6347
EPSG Name: NAD83(2011) / UTM zone 18N
See Full Coordinate Reference System Information

Access Information

Security Class: Unclassified
Data Access Procedure:

Data is available online for custom downloads

Data Access Constraints:

None

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.

Distribution Information

Distribution 1

CC ID: 857417
Start Date: 2019-06-25
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8774
Distributor:
File Name: Customized Download
Description:

Create custom data files by choosing data area, map projection, file format, etc. A new metadata will be produced to reflect your request using this record as a base.

Compression: Zip

Distribution 2

CC ID: 857418
Start Date: 2019-06-25
End Date: Present
Download URL: https://coast.noaa.gov/htdata/raster2/elevation/USGS_Hermine_Topobathy_DEM_2016_8774
Distributor:
File Name: Bulk Download
Description:

Bulk download of data files in the original coordinate system.

URLs

URL 1

CC ID: 857405
URL: https://coast.noaa.gov/
Name: NOAA's Office for Coastal Management (OCM) website
URL Type:
Online Resource
File Resource Format: HTML
Description:

Information on the NOAA Office for Coastal Management (OCM)

URL 2

CC ID: 857406
URL: https://coast.noaa.gov/dataviewer/
Name: NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV)
URL Type:
Online Resource
File Resource Format: HTML
Description:

The Data Access Viewer (DAV) allows a user to search for and download elevation, imagery, and land cover data for the coastal U.S. and its territories. The data, hosted by the NOAA Office for Coastal Management, can be customized and requested for free download through a checkout interface. An email provides a link to the customized data, while the original data set is available through a link within the viewer.

URL 3

CC ID: 857407
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8767/supplemental/post_hermine_extent_m8767.kmz
Name: Browse graphic
URL Type:
Browse Graphic
File Resource Format: KML
Description:

This graphic displays the footprint for this lidar data set.

URL 4

CC ID: 857452
URL: http://cmgds.marine.usgs.gov/fan_info.php?fan=16CNT03
Name: Source
URL Type:
Online Resource
Description:

Original USGS source data and information

Technical Environment

Description:

Microsoft Windows 7 Enterprise Service Pack 1; Esri ArcCatalog 10.2.2.3552

Data Quality

Vertical Positional Accuracy:

Quantum Spatial reports that the contract specifications required that only Nonvegetated Vertical Accuracy (NVA) were computed for raw lidar point cloud swath files. The vertical accuracy was tested with 13 independent surveys located in open terrain. These 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 area. The 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 Root Mean Square Error (RMSE) was computed to be 0.042. AccuracyZ has been tested as 0.082 meters AccuracyZ at 95 percent Confidence Interval, meeting 19.6 cm NVA 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)/American Society of Photogrammetry and Remote Sensing (ASPRS) Guidelines.Qualitative value:0.072 meters AccuracyZ at the 95 percent Confidence Interval for Raw LAS NVA. 0.063 meters AccuracyZ at the 95 percent Confidence Interval for DEM NVA. 0.137 meters AccuracyZ at the 95th percentile for DEM VVA., Test that produced the value: Quantum Spatial reports that the 13 independent NVA check points were surveyed using the closed level loop technique. Elevations interpolated from the unclassified lidar surface were compared to the elevation values of the surveyed NVA check points. The RMSE was computed to be 0.037 meters resulting in an AccuracyZ at the 95% confidence level of 0.072 meters. The 13 NVA check points were also compared to the elevations of the derived bare earth DEMs. The RMSE was computed to be 0.032 meters resulting in an AccuracyZ of 0.063 meters at the 95% confidence level. NVA AccuracyZ has been tested and meets the required 19.6 meter NVA at 95% confidence level using (RMSEz * 1.9600) for both the raw lidar point cloud and derived DEMs, as defined by the National Standards for Spatial Data Accuracy (NSSDA) and herein reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines. The 13 VVA check points were also surveyed using the closed level loop technique. Elevations for these points were compared to the elevations of the derived bare earth DEMs. The RMSE was computed to be 0.078 meters resulting in an AccuracyZ of 0.137 meters at the 95th percentile. AccuracyZ has been tested on the derived bare earth DEMs and meets the required 29.4 meter VVA using the 95th percentile of the absolute value of all vertical errors in all combined vegetation classes as defined by the National Standards for Spatial Data Accuracy (NSSDA); and herein reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines.

Completeness Report:

Quantum Spatial reports that the LAS files used to create the DEM include all data points collected. No points have been removed or excluded. Shaded relief images have been visually inspected for data errors such as pits, border artifacts, and shifting. Lidar flight lines have been examined to ensure consistent elevation values across overlapping flight lines. The raw point cloud is of good quality and data passes Vertical Accuracy specifications.

Conceptual Consistency:

Quantum Spatial reports that data cover the entire area specified for this project, approximately 52,196.2 acres. "NoData" values correspond with lack of submerged and/or bare-earth data within the survey bounds.

Lineage

Lineage Statement:

Quantum Spatial acquired and processed topobathy lidar data to DEMs. USGS combined the individual DEM tiles into a single GeoTiff. NOAA updated the georeferencing information and created a cloud optimized GeoTiff.

Process Steps

Process Step 1

CC ID: 1152819
Description:

Quantum Spatial reports the following steps for Lidar Pre-Processing:

1. Review flight lines and data to ensure complete coverage of the study area and positional accuracy of the laser points.

2. Resolve kinematic corrections for aircraft position data using kinematic aircraft GPS and static ground GPS data.

3. Develop a smoothed best estimate of trajectory (SBET) file that blends post-processed aircraft position with sensor head position and attitude recorded throughout the survey.

4. Calculate laser point position by associating SBET position to each laser point return time, scan angle, intensity, etc. Create raw laser point cloud data for the entire survey in *.las format. Convert data to orthometric elevations by applying a geoid correction.

5. Import raw laser points into manageable blocks to perform manual relative accuracy calibration and filter erroneous points. Apply the refraction correction necessary for bathymetric data. Classify ground/bathymetric points for individual flight lines.

6. Using ground classified points per each flight line, test the relative accuracy. Perform automated line-to-line calibrations for system attitude parameters (pitch, roll, heading), mirror flex (scale) and GPS/IMU drift. Calculate calibrations on ground classified points from paired flight lines and apply results to all points in a flight line. Use every flight line for relative accuracy calibration.

7. Adjust the point cloud by comparing ground classified points to supplemental ground control points.

Process Date/Time: 2016-11-30 00:00:00

Process Step 2

CC ID: 1152820
Description:

Quantum Spatial reports the following steps for Lidar Post-Processing:

1. Classify data to ground and other client designated classifications using proprietary classification algorithms.

2. Manually QC data classification

3. After completion of classification and final QC approval, calculate density information and verify final accuracy calculations for the project using ground control quality check points.

Process Date/Time: 2016-11-30 00:00:00

Process Step 3

CC ID: 1152821
Description:

Quantum Spatial reports the following steps for Breaklines: Water boundary polygons were developed using manual editing techniques. Elevations were assigned to the water’s edge from the LiDAR point cloud data. Breaklines were also used to classify water surface (class 41).

Process Date/Time: 2016-11-30 00:00:00

Process Step 4

CC ID: 1152822
Description:

Quantum Spatial reports the following steps for Bathymetric Coverage: Bathymetric coverage was determined by triangulating bathymetric points (class 40) with and edge length maximum of 4.56m to identify all areas >9m2 lacking bathymetric data. This shapefile was used to control the extent of the topobathymetric DEMs.

Process Date/Time: 2016-11-30 00:00:00

Process Step 5

CC ID: 1152823
Description:

The provided DEM .IMG files were mosaicked using Global Mapper 16 (20160309) and exported as a GeoTIFF.

Process Date/Time: 2016-12-28 00:00:00

Process Step 6

CC ID: 1152824
Description:

The merged GeoTiff file was received from USGS by NOAA OCM. The georeferencing codes were changed to reflect NAD83(2011) and NAVD88 instead of generic NAD83. Coordinates were not changed. The GeoTiff was processed to a cloud optimized GeoTiff (COG) using GDAL version 2.4.1.

Process Date/Time: 2019-06-25 00:00:00
Process Contact: Waters, Kirk
Email Address: kirk.waters@noaa.gov

Related Items

Item Type Relationship Type Title
Data Set (DS) Cross Reference 2016 USGS Lidar: Assateague Island, Maryland and Virginia, Post-Hurricane Hermine, 10-12 September 2016

Point cloud used to derive this DEM

Catalog Details

Catalog Item ID: 56742
GUID: gov.noaa.nmfs.inport:56742
Metadata Record Created By: Kirk Waters
Metadata Record Created: 2019-06-25 07:30+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