Data Management Plan (Deprecated)

These data were collected by the National Oceanic Atmospheric Administration National Geodetic Survey Remote Sensing Division using a Riegl VQ-880G system. The data were acquired from 20160219- 20160331 in twenty missions. The data includes topobathy data in an LAS 1.2 format file classified as unclassified (1), ground (2), topo noise (7), bathy noise (22), water column (25), bathymetric bottom or submerged topography (26), water surface and (27), derived water surface in accordance with project specifications. The project consists of 309.3 square miles along the shores of Puerto Rico. This dataset contains 3463 - 500 m x 500 m lidar tiles.

Lineage Statement:
A lidar point cloud was interpolated to create a topobathy digital elevation model in Puerto Rico.

Process Steps:

• 2017-06-01 00:00:00 - Dewberry made a copy of the final LiDAR data and transformed the ellipsoid heights into orthometric heights referenced to PRVD02 using Geoid 12B. LiDAR data classified as ground (2) and submerged topography (26) were then converted to ESRI multipoint format. These multipoints were then used to generate a terrain and the terrain was converted to a raster in IMG format with 1 meter pixel resolution. The terrain and output raster were created per block. The raster was clipped to the tile grid and named according to project specifications to result in tiled topobathymetric DEMs Bathymetric voids have been enforced in the DEMs as areas of NoData using a void polygon layer included in the deliverables. The void layer was created in Global Mapper where every bathy bottom point was used to create a grid. The distance or threshold that sets how far Global Mapper can interpolate around each bathy bottom point was set as 2. The higher the interpolation threshold, the more bathy bottom points are connected to create a continuous surface in the Global Mapper grid with fewer areas of NoData. The NoData areas in the Global Mapper grids are exported to polygons. Void polygons greater than 9 square meters are imported into Arc Geodatabases where they are incorporated into the terrains as erase features. When the terrains are exported to raster, the void polygons used as an erase in the terrain remain as areas of NoData. (Citation: classified lidar data)
• Data were received by NOAA Office for Coastal Management and ingested into the Digital Coast Data Access System.

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8462;