This dataset contains binary point-cloud data and a Digital Elevation Model (DEM), produced from remotely sensed, geographically referenced topobathymetric measurements encompassing the Breton Island and Gosier Islands, LA study area. The original area of interest was buffered by 100 meters to ensure complete coverage, resulting in approximately 75 square miles of lidar data.
The Breton Island Lidar project called for the planning, acquisition, processing, and derivative products of topobathymetric lidar data, collected at a nominal pulse spacing (NPS) of 0.5-0.45 meters (4-5 points/square meter). Lidar acquisition was prioritized to coincide with the lowest tide possible. Water clarity was also assessed and deemed acceptable prior to acquisition flights. The data, in meters, are projected to UTM Zone 16 North and referenced horizontally to the NAD83 (2011) datum and vertically to the NAVD88 (GEOID12A) datum. The classified point-cloud data were delivered in LAS v1.2 format and the merged DEM was converted to a GeoTIFF file. Each LAS file contains data in a 1-kilometer by 1-kilometer tile named according to the US National Grid conventions. The final product was a DEM for Breton Island along with a LAZ file for both Breton Island and Gosier Islands.
For further information regarding data collection and/or processing methods refer to USGS Open-File Report Analysis of Shoreline and Geomorphic Change for Breton Island, Louisiana from 1869 to 2014 (https://doi.org/10.3133/ofr20161039).
|Title||Topobathymetric Lidar Survey of Breton and Gosier Islands, Louisiana, January 16 and 18, 2014|
|Authors||Joseph F Terrano, James G Flocks, Kathryn Smith|
|Product Type||Data Release|
|Record Source||USGS Digital Object Identifier Catalog|
|USGS Organization||St. Petersburg Coastal and Marine Science Center|
Analysis of seafloor change at Breton Island, Gosier Shoals, and surrounding waters, 1869–2014, Breton National Wildlife Refuge, Louisiana
Analysis of shoreline and geomorphic change for Breton Island, Louisiana, from 1869 to 2014
Kathryn E L Smith, Ph.D.
Analysis of seafloor change at Breton Island, Gosier Shoals, and surrounding waters, 1869–2014, Breton National Wildlife Refuge, LouisianaCharacterizing bathymetric change in coastal environments is an important component in understanding shoreline evolution, especially along barrier island platforms. Bathymetric change is a function of the regional sediment budget, long-term wave and current patterns, and episodic impact from high-energy events such as storms. Human modifications may also cause changes in seafloor elevation. This sAuthorsJames G. Flocks, Joseph F. Terrano
Analysis of shoreline and geomorphic change for Breton Island, Louisiana, from 1869 to 2014Many barrier islands in the United States are eroding and losing elevation substantively because of storm surge, waves, and sea-level changes. This is particularly true for the deltaic barrier system in Louisiana. Breton Island is near the mouth of the Mississippi River at the southern end of the Chandeleur barrier island chain in southeast Louisiana. This report expands on previous geomorphic stuAuthorsJoseph F. Terrano, James G. Flocks, Kathryn E. L. Smith
Kathryn E L Smith, Ph.D.