56744
2016 NOAA NGS Topobathy Lidar DEM: Tarpon Springs (FL)
Data Set
Published / External
47844
DEMs
Project
Completed
2019-06
This data was collected by NOAA using a Riegl VQ880G sensor. The data was acquired from February 11, 2016 through February 14, 2016. The data includes topobathy data in LAS 1.2 format classified as created, unclassified (1); ground (2); noise (7); bathymetric noise (22); water column (25); bathymetric bottom (26); water surface (27) in accordance with project specifications. The project consists of approximately 85 square miles of data along the shores of Tarpon Springs. This dataset contains 1,224 500 m x 500 m lidar tiles.
Tarpon Springs 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 > TOPOGRAPHICAL RELIEF MAPS
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > SEAFLOOR TOPOGRAPHY
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 > FLORIDA
Theme
CoRIS Discovery Thesaurus
Geographic Information > LiDAR
Theme
CoRIS Theme Thesaurus
EARTH SCIENCE > Land Surface > Topography> Terrain Elevation
Theme
CoRIS Theme Thesaurus
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry
Theme
NOAA NOS Harvest Catalog
CoRIS
Temporal
20160211
Temporal
20160214
Spatial
CoRIS Place Thesaurus
COUNTRY/TERRITORY > United States of America > Florida
Office for Coastal Management
Charleston
SC
Data Set
None Planned
Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the National Geodetic Survey, the Office for Coastal Management, or its partners.
We request that you credit the National Oceanic and Atmospheric Administration (NOAA) when you use these data in a report, publication, or presentation.
Data Steward
2019-06
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
2019-06
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
2019-06
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
Point of Contact
2019-06
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
Ground Condition
-82.880913
-82.713906
28.267213
28.016954
Range
2016-02-11
2016-02-14
No
Projected
EPSG:6346
NAD83(2011) / UTM zone 17N
NAD83 (National Spatial Reference System 2011)
GRS 1980
6378137
298.257222101
NAD83(2011)
UTM zone 17N
Transverse Mercator
Latitude of natural origin
0° 0' 0" N
Longitude of natural origin
81° 0' 0" W
Scale factor at natural origin
0.9996
False easting
500000
metre
False northing
0
metre
1
Easting
E
metre
east
2
Northing
N
metre
north
Vertical
EPSG:5703
NAVD88 height
North American Vertical Datum 1988
1
Gravity-related height
H
metre
up
Unclassified
This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8773;
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.
https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8773
2019-06
Organization
NOAA Office for Coastal Management
Customized Download
Create custom data files by choosing data area, product type, map projection, file format, datum, etc.
Zip
Zip
https://noaa-nos-coastal-lidar-pds.s3.us-east-1.amazonaws.com/dem/NGS_FL_TarponSprings_Topobathy_DEM_2016_8773/index.html
2019-06
Organization
NOAA Office for Coastal Management
Bulk Download
Simple download of data files.
img
IMG - ERDAS Imagine
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8771/supplemental/fl2016_ngs_topobathy_tarpon_m8771.kmz
Browse Graphic
Browse Graphic
kmz
This graphic shows the lidar footprint for this project.
https://coast.noaa.gov
Office for Coastal Management
Online Resource
https://coast.noaa.gov/dataregistry
Digital Coast Data
Online Resource
https://coast.noaa.gov/dataviewer
Digital Coast Data Access Viewer
Online Resource
OS Independent
NOAA acquired and calibrated all lidar data and Dewberry classified this data and created derivative products. As such, Dewberry did not perform any absolute positional accuracy testing on this dataset. The DEMs are derived from the source lidar and inherit the accuracy of the source data. The DEMs are created using controlled and tested methods to limit the amount of error introduced during DEM production.
Not tested
Data collected to meet 15cm accuracy at 1 sigma.
Lidar
1
Data for the Tarpon Springs project was acquired by NOAA using a Riegl VQ880G sensor. All delivered lidar data is referenced to:
Horizontal Datum-NAD83 (2011) epoch: 2010
Projection-UTM Zone 17 North
Horizontal Units-meters
Vertical Datum-NAD83 (2011) epoch: 2010
Vertical Units-meters
This dataset encompasses 1,224 500 m x 500 m lidar tiles. Both green lidar data and NIR lidar data were acquired.
NOAA acquired, calibrated, and performed the refraction correction of the lidar data. Light travels at different speeds in air versus water and its direction of travel or angle is changed or refracted when entering the water column. The refraction correction process corrects for this difference by adjusting the depth (distance traveled) and horizontal position (change of angle/direction) of the lidar data acquired within water.
2018-12-03T00:00:00
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 or within a swath 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 used algoritms in TerraScan to create the intial ground/submerged topography surface.
Dewberry created 2-D breaklines by digitizing breaklines in a 2-D environment using intensity imagery as a reference. Dewberry used the 2-D breaklines 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 1.2 and point data record format 3.
The final classificaton scheme is as follows:
1-Unclassified
2-Ground
7-Noise
22-Bathymetric Noise
25-Water Column
26-Bathymetric Bottom
27-Water Surface
All data was then verified by an Independent QC department within Dewberry. The independent QC was performed by separate analysts who did not perform manual classification or editing. The independent QC involved quantitative and qualitative reviews.
2018-12-03T00:00:00
3
Dewberry made a copy of the final lidar data and transformed the data from ellipsoid heights to orthometric heights, referenced to NAVD88 Geoid 12B, meters. The lidar data in orthometric heights was used to create the final topobathymetric DEMs in orthometric heights
Lidar data was converted to a LAS Dataset. Lidar data classified as ground (2) and submerged topography (26) was then used to generate a raster in IMG format with 1 meter pixel resolution. The output raster was created over the full AOI area to reduce edge-matching issues and improve seamlessness. The raster was clipped to the tile grid and named according to project specifications to result in tiled topobathymetric DEMs.
All tiled DEMs incorporate the use of the void polygons. The void polygons represent bathymetric areas with no bathymetric bottom returns and are set as NoData in the DEMs. Void polygon creation is described in the final project report and the void polygon metadata.
A confidence layer has been created and provided to NOAA as part of the deliverables. The confidence layer is a raster product in IMG format with 1 meter square pixels. Except where there are not enough lidar data points in a pixel to calculate a standard deviation value, the confidence layer provides a standard deviation value for every pixel by calculating the standard deviation of all ground and/or submerged topography lidar points that are located within a single pixel. The confidence layer pixels align to the pixels in the topobathy DEMs. The confidence layer can be displayed by unique values or classified into desired bins/ranges for analysis over larger areas.
2019-03-01T00:00:00
4
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 17 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 17 to geographic coordinates 2. Sorted by gps time 3. Compressed the data using laszip
2019-06-21T00:00:00
Organization
Office for Coastal Management
OCM
2234 South Hobson Avenue
Charleston
SC
29405-2413
https://www.coast.noaa.gov/
gov.noaa.nmfs.inport:56744
Maryellen Sault
2019-06-25T10:50:16
Kirk Waters
2024-01-10T19:05:46
2024-01-10
Office for Coastal Management
OCM
1002
Public
No
2022-03-16
1 Year
2023-03-16