Delineated Coastal Cliff Transects Derived from Post-Hurricane Maria Lidar Elevation Data Collected from Puerto Rico: 2018
The National Assessment of Coastal Change Hazards project aims to understand and forecast coastal landscape change. This dataset consists of delineated coastal cliff transects that may be used to assess the hazard posed by eroding coastal cliffs on the islands of Puerto Rico, Culebra, and Vieques. The delineation of cliff tops and toes can be used as an input into cliff hazard metrics and to measure overall cliff changes over time. Cliff tops and cliff toes were identified along three-dimensional (3D) transects using the Cliff Feature Delineation Tool (Seymour and others, 2020), which assigned coordinate locations (X, Y, Z) of cliff features over a 140,244-meter (m) stretch of the Puerto Rican coastline at 10-m intervals and output them as either polyline (cliff transects) or point (cliff top or toe) shapefiles. Feature delineation was preformed using post-Hurricane Maria (landfall was September 20, 2017) rasterized topobathy lidar elevation data collected by the U.S. Army Corps of Engineers and published by the National Oceanic and Atmospheric Administration National Centers for Environmental Information (2018) as bare earth digital elevation model (DEM) files. The delineation tool (Seymour and others, 2020) was used to generate 3D point features in Esri ArcGIS shapefile format representing the cliff transects, these files should be opened in a 3D geographic information system (GIS) viewer.
Bendik, Kirsten J., Seymour, Alexander C., and Doran, Kara S., 20210121, Delineated Coastal Cliff Transects Derived from Post-Hurricane Maria Lidar Elevation Data Collected from Puerto Rico: 2018: U.S. Geological Survey Data Release doi:10.5066/F7610XCX, U.S. Geological Survey, St. Petersburg, FL.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.6096
Ordinates (y-coordinates) are specified to the nearest 0.6096
Planar coordinates are specified in Meter
The horizontal datum used is D WGS 1984.
The ellipsoid used is WGS 1984.
The semi-major axis of the ellipsoid used is 6378137.0.
The flattening of the ellipsoid used is 1/298.257223563.
Shapefile and associated attribute table comprised of cliff transect features delineated from post-Hurricane Maria topobathy lidar elevation data acquired on the islands of Puerto Rico, Culebra, and Vieques in 2018.
The ObjectID field created by default by ArcGIS. Establishes a unique ID for each shapefile feature or table entry.
Range of values
Shape geometry field created by default by ArcGIS. Labels features' geometry type.
The unique identifier per each processing run for the transect and also records the distance along the offshore baseline at which the transect was generated.
Range of values
The planar transect length.
Range of values
The elevation at the seaward start of the transect, referenced to PRVD02.
Range of values
The elevation at the landward end of the transect, referenced to PRVD02.
Range of values
The compass bearing of the transect, measured from seaward start to landward end.
Range of values
Records the processing region as well as the processing settings used in the Cliff Feature Delineation Tool to generate the transects.
Values recorded reflect multiple processing regions and various settings associated with numerous runs of the Cliff Feature Delineation Tool (Seymour and others, 2020). Different iterations correspond to particular sections of coastline and are recorded in text format.
References transect line, which corresponds to generated cliff tops and toes.
Values recorded reflect the transect numbers and regional names that coincide with multiple processing regions and settings associated with numerous runs of the Cliff Feature Delineation Tool (Seymour and others, 2020). Different iterations correspond to particular sections of coastline and are recorded in text format.
To provide data on the morphology of coastal cliffs in Puerto Rico and surrounding islands offshore of the east coast. Additional survey and data details are available from the U.S. Geological Survey Coastal and Marine Geoscience Data System (CMGDS) at https://cmgds.marine.usgs.gov/fan_info.php?fan=2018-307-DD.
National Oceanic and Atmospheric Administration (NOAA), U.S. Army Corps of Engineers (USACE), and Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX), 20180828, 2018 USACE FEMA Topobathy Lidar DEM: Main Island, Culebra, and Vieques, Puerto Rico.
The Cliff Feature Delineation Tool (Seymour and others, 2020) was used to extract cliff top and toe points at 10-m alongshore intervals wherever coastal cliffs were present along the Puerto Rico coastline. For more information on how cliff top and toe features were extracted, please see USGS Open-File Report 2020–1070 (Seymour and others, 2020). The process of delineating the cliff transect features began by using a 2018 post-Maria bare earth topobathy lidar DEM as the elevation input. The DEM downloaded from the NOAA NCEI site was a 32-bit GeoTiff raster image with a 1-m grid spacing. Horizontal positions were provided in geographic coordinates referenced to the World Geodetic System of 1984 (WGS84) Universal Transverse Mercator (UTM) Zone 20 North (20N) and vertical positions were referenced to the Puerto Rico Vertical Datum of 2002 (PRVD02). Baseline inputs were represented by Esri ArcGIS shoreline vectors or generated by the Cliff Feature Delineation Tool. A user parameterized tool iterated separately for regions of a cliff that had relatively similar morphology, in all cases following rules outlined in the Seymour and others (2020) user guide. The final file, CliffTransects_PuertoRico.shp, was output with horizontal positions and elevations remaining in their native projected coordinate reference systems. Outputs went through a QA/QC process in ArcGIS Pro and were edited, if needed.
Seymour, A.C., Hapke, C.J., and Warrick, J., 2020, Cliff Feature Delineation Tool and Baseline Builder Version 1.0: U.S. Geological Survey Open File Report 2020-1070, 54p. doi:10.3133/ofr20201070, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St.Petersburg, Florida.
Seymour, A.C., Hapke, C.J., and Warrick, J., 2020, Cliff Feature Delineation Tool and Baseline Builder Version 1.0: U.S. Geological Survey Software Release doi:10.5066/P9UKW7PO, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.
How accurate are the geographic locations?
Horizontal accuracy of the cliff toe is represented only by the published horizontal error estimate (1 meter) of the lidar-derived DEM that was used to generate cliff features.
How accurate are the heights or depths?
Vertical accuracy of the cliff toe is represented only by the published vertical error estimate (0.196 meters) of the lidar-derived DEM that was used to generate cliff features.
Where are the gaps in the data? What is missing?
This dataset is considered complete for the information presented as described in the abstract section. Users are advised to read the rest of the metadata record carefully for additional details.
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originators of the data in future products or derivative research.
This digital publication was prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.