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Short Citation:
OCM Partners, 2022: 2018 USACE FEMA Topobathy Lidar DEM: Main Island, Culebra, and Vieques, Puerto Rico, https://www.fisheries.noaa.gov/inport/item/53098.

Item Identification

Title: 2018 USACE FEMA Topobathy Lidar DEM: Main Island, Culebra, and Vieques, Puerto Rico
Short Name: pr2018_usace_pr_dem_m8571_metadata
Status: Completed
Abstract:

These bare earth Digital Elevation Model (DEM) files along the Puerto Rico coast, contain rasterized topobathy lidar elevations at a 1 meter grid size, generated from data collected by the Coastal Zone Mapping and Imaging Lidar (CZMIL) system. CZMIL integrates a lidar sensor with simultaneous topographic and bathymetric capabilities, a digital camera and a hyperspectral imager on a single remote sensing platform for use in coastal mapping and charting activities. Native lidar data is not generally in a format accessible to most Geographic Information Systems (GIS). Specialized in-house and commercial software packages are used to process the native lidar data into 3-dimensional positions that can be imported into GIS software for visualization and further analysis.

In addition to the bare earth DEMs, the topobathy lidar point data from which these DEM data were created, are also available. A link to this data is provided in the URL section of this metadata record. DEMs that were created from all classes of points (1, 2, 29) at a 1 meter grid size are available by request via email at: coastal.info@noaa.gov.

Original contact information:

Contact Org: JALBTCX

Title: Data Production Manager

Phone: 228-252-1131

Email: JALBTCX@usace.army.mil

Purpose:

This data was collected by USACE on behalf of FEMA as part of the Puerto Rico Shoreline Erosion Assessment Survey following Hurricane Maria to assess changes in elevations above and below water along the coast.

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 > 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
Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > SOLID EARTH > GEOMORPHOLOGY > COASTAL LANDFORMS/PROCESSES
None beach
None DEM
None DOD/USARMY/USACE/SAM/MOBILE/OPJ/JALBTCX > Department of Defense
None erosion
None National Coastal Mapping Program (NCMP)
None Post-Maria
None U.S. Army Corps of Engineers (USACE)

Temporal Keywords

Thesaurus Keyword
UNCONTROLLED
None 2018
None August
None July

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA > PUERTO RICO
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > LAND SURFACE
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > SEA FLOOR

Instrument Keywords

Thesaurus Keyword
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
Data Presentation Form: Model (digital)
Distribution Liability:

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: Acknowledgement of the Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) would be appreciated in any publications or derived products.

Support Roles

Data Steward

CC ID: 762881
Date Effective From: 2018
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: 762882
Date Effective From: 2018
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: 762883
Date Effective From: 2018
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: 762884
Date Effective From: 2018
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: 1152160
W° Bound: -67.286
E° Bound: -65.203
N° Bound: 18.524
S° Bound: 17.9

Extent Group 1 / Time Frame 1

CC ID: 1152141
Time Frame Type: Discrete
Start: 2018-07-03
Description:

Blk_209, Blk_210, Blk_211

Extent Group 1 / Time Frame 2

CC ID: 1152142
Time Frame Type: Discrete
Start: 2018-07-04
Description:

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Extent Group 1 / Time Frame 3

CC ID: 1152143
Time Frame Type: Discrete
Start: 2018-07-05
Description:

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Extent Group 1 / Time Frame 4

CC ID: 1152144
Time Frame Type: Discrete
Start: 2018-07-06
Description:

Blk_202

Extent Group 1 / Time Frame 5

CC ID: 1152145
Time Frame Type: Discrete
Start: 2018-07-07
Description:

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Extent Group 1 / Time Frame 6

CC ID: 1152146
Time Frame Type: Discrete
Start: 2018-07-08
Description:

Blk_203

Extent Group 1 / Time Frame 7

CC ID: 1152147
Time Frame Type: Discrete
Start: 2018-07-11
Description:

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Extent Group 1 / Time Frame 8

CC ID: 1152148
Time Frame Type: Discrete
Start: 2018-07-12
Description:

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Extent Group 1 / Time Frame 9

CC ID: 1152149
Time Frame Type: Discrete
Start: 2018-07-18
Description:

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Extent Group 1 / Time Frame 10

CC ID: 1152150
Time Frame Type: Discrete
Start: 2018-07-20
Description:

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Extent Group 1 / Time Frame 11

CC ID: 1152151
Time Frame Type: Discrete
Start: 2018-07-21
Description:

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Extent Group 1 / Time Frame 12

CC ID: 1152152
Time Frame Type: Discrete
Start: 2018-07-22
Description:

Blk_214, Blk_218

Extent Group 1 / Time Frame 13

CC ID: 1152153
Time Frame Type: Discrete
Start: 2018-07-23
Description:

Blk_215, Blk_216

Extent Group 1 / Time Frame 14

CC ID: 1152154
Time Frame Type: Discrete
Start: 2018-07-24
Description:

Blk_217

Extent Group 1 / Time Frame 15

CC ID: 1152155
Time Frame Type: Discrete
Start: 2018-07-25
Description:

Blk_225, Blk_226, Blk_227, Blk_228

Extent Group 1 / Time Frame 16

CC ID: 1152156
Time Frame Type: Discrete
Start: 2018-07-26
Description:

Blk_214, Blk_215

Extent Group 1 / Time Frame 17

CC ID: 1152157
Time Frame Type: Discrete
Start: 2018-07-27
Description:

Blk_215

Extent Group 1 / Time Frame 18

CC ID: 1152158
Time Frame Type: Discrete
Start: 2018-07-28
Description:

Blk_215, Blk_225

Extent Group 1 / Time Frame 19

CC ID: 1152159
Time Frame Type: Discrete
Start: 2018-08-17
Description:

Blk_219, Blk_220

Access Information

Security Class: Unclassified
Data Access Procedure:

Data is available online for custom and bulk downloads.

Data Access Constraints:

None

Data Use Constraints:

These data have been developed from the best available sources. Although efforts have been made to ensure that the data are accurate and reliable, errors and variable conditions originating from physical sources used to develop the data may be reflected in the data supplied. Users must be aware of these conditions and bear responsibility for the appropriate use of the information with respect to possible errors, scale, resolution, rectification, positional accuracy, development methodology, time period, environmental and climatic conditions and other circumstances specific to these data. The user is responsible for understanding the accuracy limitations of the data provided herein. The burden for determining fitness for use lies entirely with the user. The user should refer to the accompanying metadata notes for a description of the data and data development procedures. 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: 762885
Start Date: 2018
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8571
Distributor:
File Name: Customized Download
Description:

Link to custom download the DEM data from the Data Access Viewer(DAV). A new metadata will be produced to reflect your request using this record as a base.

Compression: Zip

Distribution 2

CC ID: 762886
Start Date: 2018
End Date: Present
Download URL: https://coast.noaa.gov/htdata/raster2/elevation/USACE_PR_Topobathy_DEM_2018_8571
Distributor:
File Name: Bulk Download
Description:

Link to bulk download the DEM data.

URLs

URL 1

CC ID: 762887
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: 762888
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: 762889
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8560/supplemental/pr2018_usace_pr_m8560.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: 763845
URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8560
URL Type:
Online Resource
Description:

Link to custom download the lidar point data from which these raster Digital Elevation Model (DEM) data were created.

Data Quality

Analytical Accuracy:

JALBTCX evaluates the horizonal accuracy of the final data coverage against availlable basemap imagery products. The final lidar point cloud is gridded according to proceedures defined in the JALBTCX Standard Operating Guide and Appendices (SOGA). The grid products are then visually compared to basemap imagery products to verify the horizontal positions of large buildings and other urban features with the data coverage.

JALBTCX evaluates the vertical accuracy of the final data coverage against traditional ground-truth data. Ground-truth data is acquired and utilized according to specifications outlined in the JALBTCX Standard Operating Guide and Appendices (SOGA) as well as the USGS Lidar BaseSpecification. The final lidar point cloud at every project ground-truth location is compared against ground-truth points in the 'bare_ground' class. Comparisons are performed in the QCoherent LP360 software package, and the final results are output to JALBTCX's Ground Truth Comparison Report.

Horizontal Positional Accuracy:

CZMIL topographic data - Compiled to meet 1 m horizontal accuracy at 95% confidence level. CZMIL bathymetric data - Compiled to meet 3.5 + 0.05d m horizontal accuracy at 95% confidence level, d is depth.

Vertical Positional Accuracy:

CZMIL topographic data - Compiled to meet 19.6 cm vertical accuracy at 95% confidence level. CZMIL bathymetric shallow FOV data - Compiled to meet SQRT((0.20^2) +((0.0075d)^2)) m vertical accuracy at 95% confidence level, d is depth. CZMIL bathymetric deep FOV data - Compiled to meet SQRT((0.30^2) +((0.013d)^2)) m vertical accuracy at 95% confidence level, d is depth.

Completeness Report:

Planned data coverage for this dataset included a 750-meter swath of the Puerto Rico shoreline for the main island, Culebra, and Vieques. Topographic lidar coverage was obtained from the shoreline onshore 500 meters. Bathymetric lidar coverage extends from the shoreline offshore 250 meters or to laser exinction, whichever occurs first. The planned data density is 70 centimeters on land and in shallow water. In deeper water the planned data density decreases to 2 meters. Gaps or data holidays may exist in the data coverage. They arise due to a number of operational and environmental conditions, including but not limited to, airspace restrictions, high terrain, active surf, low-reflectivity bottom substrate materials and turbidity in the water column. Please see the Report of Survey for additional details.

Conceptual Consistency:

Every effort within operational constraints was made to acquire data that meets specifications as outlined in this project's Statement of Work. Per flight block, elevations in areas of swath overlap are internally consistent and meet CZMIL specifications. Annomalous high and/or low elevation values have been removed, and point cloud classificaiton algorithms have been validated via manual review and QC. Temporal differences in elevation exist in areas of active nearshore processes from the dune to the depth of closure. JALBTCX conducts operations in a manner to ameliorate temporal differences, to include the collection of entire flight blocks within single missions. For a given flight block, it's adjacent flight blocks are captured within 3 days as weather and airspace permit.

Quality Control Procedures Employed:

JALBTCX evaluates final data coverage using techniques that are common to the lidar industry. These techniques are performed in a 3D environment for visual review of the final data coverage and verification of data alongside lidar waveforms and imagery collected concurrent with the lidar. Data reviewers perform checks to verify (1) extreme high and/or low elevation values have been invalidated, (2) elevations in areas of swath overlap are internally consistent, (3) binned standard deviation values meet CZMIL specifications, (4) point cloud classifications are valid, and (4) CZMIL processing modes are valid.

Lineage

Lineage Statement:

CZMIL data is processed from raw lidar waveforms to point clouds using the CZMIL HydroFusion software package. Point clouds are then classified and edited in industry-standard software packages. Derivative data products are generated through the application of gridding and contouring algorithms in a GIS environment. The data processing workflow, including software packages, algorithms and parameters are provided in detail, herein this metadata as Process Steps.

Process Steps

Process Step 1

CC ID: 1152136
Description:

These data were collected using the CZMIL system. It is owned and operated by the U.S. Army Corps of Engineers (USACE). The system collects topobathy lidar data at 10 kHz and RGB imagery at 2 Hz. A CASI-1500 hyperspectral line scanner is integrated with the system as well. Aircraft position, velocity and acceleration information are collected through a combination of Novatel and POS A/V 610 equipment. All raw data streams are transferred to the office for downloading and processing in CZMIL’s HydroFusion software. Aircraft position data are processed using POSPac software and the results are combined with the lidar data to produce 3-D positions for each lidar shot. Upon inspection and QA/QC in the software packages Fledermaus and PFM_ABE, anomalous data are flagged as invalid and have the withheld bit set.

Process Date/Time: 2018-07-06 00:00:00

Process Step 2

CC ID: 1152137
Description:

LAS files are imported into TerraScan V13 module within Microstation V8i, classifies valid topobathy data as ground points (2) and unclassified points (1), and valid bathymetric points (29). Upon completion the macro, the classification results undergo quality control and any misclassified points are manually edited. In areas of dense vegetation the bare earth ground points might be incorrectly classified due to the inability of the laser to penetrate the canopy and reach the bare ground. In these areas, JALBTCX defaults to the algorithm’s “ground” surface instead of manually reclassifying those points. They are partitioned into a series of 1-km delivery boxes, one Classified LAS file per box. The format of the file is LAS version 1.2. Data are classified as 1 (valid non-ground topographic data), 2 (valid ground topographic data), and 29 (valid bathymetric data). The National Geodetic Survey's (NGS) GEOID12B model is used to transform the horizontal positions from UTM to Geographic coordinates referenced to the North American Datum of 1983 National Adjustment of 2011 (NAD83 NA11). Vertical positions are also transformed from ellipsoid to orthometric heights referenced to the Puerto Rico Vertical Datum of 1988 (PRVD02).

Process Date/Time: 2018-07-10 00:00:00

Process Step 3

CC ID: 1152138
Description:

Data classified as ground points (2), and bathymetric points (29) in the las files are converted to a grid by generating a triangulated irregular network (TIN) and then extracting the grid node elevations from the TIN surface. The origin point of the grid is located at a horizontal position whose value is evenly divisible by the 1m grid resolution such that rasters from subsequent surveys have common cell boundaries. JALBTCX uses Quick Terrain Modeler V8 to perform this operation utilizing the following parameters; “Adaptive Triangulation, Max Z”, "Max Sample Excursion - 30000”, “Max Triangle Side – 30000”, and “Tiling Settings Snap to Grid (Expand)." The grid is exported from Quick Terrain Modeler as a 32-bit GeoTiff. Utilizing an in-house python script within ESRI ArcMap V10.5, the GeoTiff projection is defined as “The North American Datum of 1983 (2011).”

Process Date/Time: 2018-07-10 00:00:00

Process Step 4

CC ID: 1152139
Description:

The NOAA Office for Coastal Management (OCM) received the data for the Puerto Rico project area in tif format from JALBTCX. The bare earth raster files were at a 1 m grid spacing. The data were in geographic coordinates and Puerto Rico Vertical Datum 2002 (PRVD02) elevations in meters. OCM copied the raster files to https for Digital Coast storage and provisioning purposes.

Process Date/Time: 2018-07-17 00:00:00
Process Contact: Office for Coastal Management (OCM)

Catalog Details

Catalog Item ID: 53098
GUID: gov.noaa.nmfs.inport:53098
Metadata Record Created By: Rebecca Mataosky
Metadata Record Created: 2018-07-19 15:49+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-03-29 17:49+0000
Metadata Record Published: 2022-03-16
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Review Frequency: 1 Year