59171
2018 NOAA NGS Topobathy Lidar: Chesapeake Bay, VA (Fisherman Island National Wildlife Refuge to Pitts Neck)
Data Set
Published / External
59025
NGS Lidar
Project
Completed
2019-07-24
These data were collected by NOAA using a Riegl VQ-880-G sensor. The data were acquired March 29, 2018 through May 25, 2018. The data include topobathymetric lidar data in LAS 1.4 format classified as created unclassified (1); ground (2); noise (7); bathymetric point (40); water surface (41); submerged object, not otherwise specified (43); water column (45); in accordance with project specifications. The project consists of approximately 518 square miles of data in Chesapeake Bay, Virginia. This dataset contains 1,527 1000 m x 1000 m lidar tiles.
Chesapeake Bay, Virginia, has been identified as having critical topographic and bathymetric data gaps by NOAA. This lidar data will fill those critical gaps.
The full workflow used for this project is found in the final project report submitted to NOAA.
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY > COASTAL BATHYMETRY
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION
Theme
ISO 19115 Topic Category
elevation
Spatial
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
Spatial
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > LAND SURFACE
Spatial
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > SEA FLOOR
Instrument
Global Change Master Directory (GCMD) Instrument Keywords
LIDAR > Light Detection and Ranging
Platform
Global Change Master Directory (GCMD) Platform Keywords
Airplane > Airplane
Theme
beach
Theme
erosion
Office for Coastal Management
Charleston
SC
Data Set
Elevation
None Planned
Model (digital)
Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners
National Oceanic and Atmospheric Administration (NOAA), National Geodetic Survey (NGS), Remote Sensing Division (RSD), Coastal Mapping Program (CMP)
71996
NOAA NGS Topobathy Lidar Class Scheme: Chesapeake Bay, VA
Published / External
Completed
Other
Yes
Class table describing the class numbers used in the lidar data file. Each point in the lidar file has a class associated.
1
1 - Unclassified
Point class number
No
No
Active
Unclassified point
2
2- Ground
Point class number
No
No
Active
Ground Point
3
7 - Low Point (Noise)
Point class number
No
No
Active
Low Point (Noise)
4
40 - Bathymetric Point
Point class number
No
No
Active
Point classified as bathymetric ground.
5
43 - Submerged Object
Point class number
No
No
Active
Submerged object, not otherwise specified (e.g., wreck, rock, submerged piling)
6
45 - Water Column
Point class number
No
No
Active
Point classified as water column
Data Steward
2019
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Distributor
2019
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Metadata Contact
2019
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Originator
2019
Organization
National Geodetic Survey
NGS
1315 East-West Hwy
Silver Spring
MD
20910
https://geodesy.noaa.gov/
Ground Condition
-76.082503
-75.528667
38.036499
37.059439
Range
2018-03-29
2018-05-25
No
No
No
No
No
Geographic 3D
EPSG:6319
NAD83(2011)
NAD83 (National Spatial Reference System 2011)
GRS 1980
6378137
298.257222101
1
Geodetic Latitude
Lat
degree
north
2
Geodetic Longitude
Lon
degree
east
3
Elipsoidal height
h
metre
up
Unclassified
Data is available online for bulk or custom downloads
None
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.
2019-11-27
https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=9074
2019
Organization
NOAA Office for Coastal Management
Customized Download
Create custom data files by choosing data area, product type, map projection, file format, datum, etc. A new metadata will be produced to reflect your request using this record as a base. Change to an orthometric vertical datum is one of the many options.
Zip
Zip
2019-11-27
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/9074/index.html
2019
Organization
NOAA Office for Coastal Management
Bulk Download
Bulk download of data files in LAZ format, geographic coordinates, orthometric heights. Note that the vertical datum (hence elevations) of the files here are different than described in this document. They will be in an orthometric datum.
LAZ
LAS/LAZ - LASer
Zip
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/9074/supplemental/va2018_ches_m9074.kmz
Browse graphic
Browse Graphic
KML
This graphic displays the footprint for this lidar data set.
https://coast.noaa.gov/dataviewer/
NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV)
Online Resource
HTML
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.
OS Independent
NOAA acquired and calibrated all lidar data and Dewberry classified this data and created derivative products. NOAA collected data to meet 15cm vertical accuracy at 1 sigma.
Data covers the project boundary.
Not applicable
Yes
Unknown
Yes
NCEI-CO
Data is backed up to tape and to cloud storage.
Acquisition
Organization
National Geodetic Survey
Originator
Processing
Organization
Dewberry
Originator
1
Data for the Chesapeake Bay project was acquired by NOAA using a Riegl VQ-880-G sensor. All delivered lidar data is referenced to:
Horizontal Datum-NAD83 (2011) epoch: 2010
Projection-UTM Zone 18 North
Horizontal Units-meters
Vertical Datum- NAD83 (2011) epoch: 2010
Vertical Units-meters
This dataset encompasses 1,527 1000m x 1000m tiles. Both green lidar data and NIR lidar data were acquired.
NOAA acquired, calibrated, and performed the refraction correction of the lidar data.
Organization
National Geodetic Survey
NGS
1315 East-West Hwy
Silver Spring
MD
20910
https://geodesy.noaa.gov/
2
Dewberry received the calibrated green and NIR data and verified complete coverage. Relative accuracy of the green swaths compared to overlapping and adjacent green swaths as well as the relative accuracy of green swaths compared to overlapping and adjacent NIR swaths was verified through the use of Delta-Z (DZ) orthos created in GeoCue software. Intraswath relative accuracy was verified using Quick Terrain Modeler. Profiles of elevated planar features, such as roofs, were used to verify horizontal alignment between overlapping swaths. Dewberry then verified absolute vertical accuracy of the swath data prior to full-scale production.
Dewberry used algorithms in TerraScan to create the initial ground/submerged topography surface.
Dewberry used rasterized aggregate extents of refracted points to create automated 2-D breaklines with LAStools and ArcGIS. Light travels at different speeds in air versus water and its speed and direction of travel change when it enters the water column. The refraction correction process accounts for this difference by adjusting the depth (distance traveled) and horizontal position (change of angle/direction) of the lidar points acquired within water. These breaklines delineate areas where the refraction correction was applied to the lidar data by Riegl's automated refraction correction software based on the software's detection of water. Where the automated process missed discrete water bodies that did not contain valid bathymetry (submerged topography) data, breaklines were manually drawn and added to a separate feature class to ensure the correct classification of the point cloud.
Dewberry used the 2-D refraction extents and additional bathy features to classify the bathymetric bottom and ground points properly in TerraScan.
All lidar data was peer-reviewed. Dewberry's QAQC also included creating void polygons for use during review. All necessary edits were applied to the dataset. GeoCue software was used to update LAS header information, including all projection and coordinate reference system information. The final lidar data are in LAS format 1.4 and point data record format 6.
The final classificaton scheme is as follows:
1-Unclassified
2-Ground
7- Noise
40- Bathymetric point
41- Water surface
43- Submerged object, not otherwise specified
45- Water column
All data is then verified by an Independent QC department within Dewberry. The independent QC is performed by separate analysts who do not perform manual classification or editing. The independent QC involves quantitative and qualitative reviews.
2019-02-01T00:00:00
Organization
National Geodetic Survey
NGS
1315 East-West Hwy
Silver Spring
MD
20910
https://geodesy.noaa.gov/
3
The NOAA Office for Coastal Management (OCM) received files in las format. The files contained lidar elevation and intensity measurements. The data were in UTM Zone 18 coordinates and ellipsoid elevations in meters. OCM performed the following processing on the data for Digital Coast storage and provisioning purposes: 1. Converted from UTM Zone 18 to geographic coordinates 2. Sorted by gps time 3. Compressed the data using laszip.
Organization
Office for Coastal Management
OCM
2234 South Hobson Avenue
Charleston
SC
29405-2413
https://www.coast.noaa.gov/
71996
Entity
NOAA NGS Topobathy Lidar Class Scheme: Chesapeake Bay, VA
gov.noaa.nmfs.inport:59171
Maryellen Sault
2020-03-30T09:13:39
SysAdmin InPortAdmin
2023-10-17T16:12:20
2022-03-16
National Geodetic Survey
NGS
1002
Public
No
2022-03-16
1 Year
2023-03-16