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Short Citation:
Office for Coastal Management, 2023: 2016 NOAA NGS Topobathy Lidar DEM: Tarpon Springs (FL), https://www.fisheries.noaa.gov/inport/item/56744.

Item Identification

Title: 2016 NOAA NGS Topobathy Lidar DEM: Tarpon Springs (FL)
Status: Completed
Publication Date: 2019-06
Abstract:

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.

Purpose:

Tarpon Springs has been identified as having critical topographic and bathymetric data gaps by NOAA. This lidar data will fill those critical gaps

Supplemental Information:

The full workflow used for this project is found in the final project report submitted to NOAA.

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 > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY
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
CoRIS Discovery Thesaurus Geographic Information > LiDAR
CoRIS Theme Thesaurus EARTH SCIENCE > Land Surface > Topography> Terrain Elevation
CoRIS Theme Thesaurus EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry
NOAA NOS Harvest Catalog CoRIS

Temporal Keywords

Thesaurus Keyword
UNCONTROLLED
None 20160211
None 20160214

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > FLORIDA
UNCONTROLLED
CoRIS Place Thesaurus COUNTRY/TERRITORY > United States of America > Florida

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
Distribution Liability:

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.

Data Set Credit: We request that you credit the National Oceanic and Atmospheric Administration (NOAA) when you use these data in a report, publication, or presentation.

Support Roles

Data Steward

CC ID: 857539
Date Effective From: 2019-06
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: 857541
Date Effective From: 2019-06
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: 857542
Date Effective From: 2019-06
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: 857540
Date Effective From: 2019-06
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: 1152794
W° Bound: -82.880913
E° Bound: -82.713906
N° Bound: 28.267213
S° Bound: 28.016954

Extent Group 1 / Time Frame 1

CC ID: 1152793
Time Frame Type: Range
Start: 2016-02-11
End: 2016-02-14

Spatial Information

Spatial Representation

Representations Used

Vector: No

Reference Systems

Reference System 1

CC ID: 1152791

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: 1152790

Coordinate Reference System

CRS Type: Projected
EPSG Code: EPSG:6346
EPSG Name: NAD83(2011) / UTM zone 17N
See Full Coordinate Reference System Information

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=8773;

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: 857543
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8773
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2019-06 - 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: 857544
Download URL: https://coast.noaa.gov/htdata/raster2/elevation/NGS_FL_TarponSprings_Topobathy_DEM_2016_8773
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2019-06 - Present)
File Name: Bulk Download
Description:

Simple download of data files.

File Type: img

URLs

URL 1

CC ID: 857545
URL: https://coast.noaa.gov/dataviewer
Name: Digital Coast Data Access Viewer
URL Type:
Online Resource

URL 2

CC ID: 857546
URL: https://coast.noaa.gov/dataregistry
Name: Digital Coast Data
URL Type:
Online Resource

URL 3

CC ID: 857547
URL: https://coast.noaa.gov
Name: Office for Coastal Management
URL Type:
Online Resource

URL 4

CC ID: 857548
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8771/supplemental/fl2016_ngs_topobathy_tarpon_m8771.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar footprint for this project.

Technical Environment

Description:

OS Independent

Data Quality

Representativeness:

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.

Horizontal Positional Accuracy:

Not tested

Vertical Positional Accuracy:

Data collected to meet 15cm accuracy at 1 sigma.

Lineage

Sources

Lidar

CC ID: 1152785

Process Steps

Process Step 1

CC ID: 1152786
Description:

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.

Process Date/Time: 2018-12-03 00:00:00

Process Step 2

CC ID: 1152787
Description:

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.

Process Date/Time: 2018-12-03 00:00:00

Process Step 3

CC ID: 1152788
Description:

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.

Process Date/Time: 2019-03-01 00:00:00

Process Step 4

CC ID: 1152789
Description:

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

Process Date/Time: 2019-06-21 00:00:00
Process Contact: Office for Coastal Management (OCM)

Catalog Details

Catalog Item ID: 56744
GUID: gov.noaa.nmfs.inport:56744
Metadata Record Created By: Maryellen Sault
Metadata Record Created: 2019-06-25 10:50+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: OCM
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