This Data Series Report contains lidar elevation data collected September 5 to October 11, 2012, for the barrier islands of Alabama, Mississippi and southeast Louisiana, including the coast near Port Fourchon. Most of the data were collected September 5-10, 2012, with a reflight conducted on October 11, 2012, to increase point density in some areas.
Lidar data exchange format (LAS) 1.2 formatted point data files were generated based on these data. The point cloud data were processed to extract bare earth data; therefore, the point cloud data are organized into only four classes: 1-unclassified, 2-ground, 7-noise and 9-water.
Aero-Metric, Inc., was contracted by the U.S. Geological Survey (USGS) to collect and process these data.
The lidar data were collected at a nominal pulse spacing (NPS) of 1.0 meter (m).
The horizontal projection and datum of the data are Universe Transverse Mercator, zones 15N and 16N, North American Datum 1983 (UTM Zone 15N or 16N NAD83), meters. The vertical datum is North American Vertical Datum 1988, Geoid 2012 (NAVD88, GEOID12), meters.
These lidar data are available to Federal, State and local governments, emergency-response officials, resource managers, and the general public.
The lidar survey was acquired to document the changes of several different barrier island systems resulting from Hurricane Isaac. This survey supports detailed studies of Louisiana, Mississippi and Alabama barrier islands that resolve annual and episodic changes in beaches, berms and dunes associated with processes driven by storms, sea-level rise, and even human restoration activities.
Lidar data acquisition, calibration, and follow-on processing were completed by Aero-Metric, Inc. Aero-Metric was contracted by the USGS to conduct the work.
The file naming convention is based on a 2-kilometer (km) by 2-km tiling scheme. The geographic extent of each tile falls on even 2000 x and y UTM zone 15N or 16N, NAD83, meters, coordinates. The first two digits of the file name represent the UTM zone. The last eight digits are based on the lower-left (LL) xy coordinates of the tile. For example, tile name 15_69802160 uses 6980 to represent an LL x-coordinate of 698,000, and uses 2160 to represent an LL y-coordinate of 3,216,000 (ignoring the first digit).
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: barrier islands
Theme_Keyword: Hurricane Isaac
Theme_Keyword: Light Detection and Ranging
Theme_Keyword: remote sensing
Theme_Keyword: elevation data
Theme_Keyword: bare earth
Theme_Keyword: laser altimetry
Theme_Keyword_Thesaurus: Global Change Master Science Directory (GCMD)
Theme_Keyword: LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
Theme_Keyword: OCEAN > COASTAL PROCESSES > BARRIER ISLANDS
Theme_Keyword: COASTAL PROCESSES > BEACHES
DOI/USGS/CMG > COASTAL AND MARINE GEOLOGY, U.S. GEOLOGICAL SURVEY, U.S. DEPARTMENT OF INTERIOR
Theme_Keyword_Thesaurus: GCMD Instrument
Theme_Keyword: LIDAR > LIGHT DETECTION AND RANGING
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: bathymetry and elevation
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Keywords
Theme_Keyword: topographic mapping
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: digital elevation models
Place_Keyword: Gulf of Mexico
Place_Keyword: Barrier Islands
Place_Keyword: Gulf of Mexico Barrier Islands
Place_Keyword: Raccoon Island
Place_Keyword: Trinity Island
Place_Keyword: Isles Dernieres
Place_Keyword: Timbalier Island
Place_Keyword: East Timbalier Island
Place_Keyword: Port Fourchon
Place_Keyword: Elmers Island
Place_Keyword: Grand Isle
Place_Keyword: Grand Terre Island
Place_Keyword: Bastian Island
Place_Keyword: Pelican Island
Place_Keyword: Stake Island
Place_Keyword: Grand Gosier Island
Place_Keyword: Breton Island
Place_Keyword: Chandeleur Islands
Place_Keyword: Cat Island
Place_Keyword: Ship Island
Place_Keyword: Horn Island
Place_Keyword: Petit Bois Island
Place_Keyword: Dauphin Island
Place_Keyword: United States
None. However, users should be aware that temporal changes may have occurred since this dataset was collected and some parts of this data may no longer represent surface conditions. Users should not use this data for critical applications without a full awareness of its limitations.
Acknowledgment of the U.S. Geological Survey would be appreciated for products derived from these data.
Contact_Organization: U.S. Geological Survey
Contact_Person: Nathaniel Plant
Address_Type: mailing and physical
Address: 600 4th St. S.
City: St. Petersburg
Monday through Friday 9:00 AM to 5:00 PM (Eastern Time)
Dataset_Credit: Acknowledgment of the U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices. Sharing of new data layers developed directly from these data would also be appreciated by the U.S. Geological Survey staff. Users should be aware that comparisons with other datasets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in photointerpretation, mapping conventions, and digital processes over time. These data are not legal documents and are not to be used as such.
Contractor: Aero-Metric, Inc.
1. Scanner - Optech 3100 Serial 05SEN175 and Leica ALS70 SN7169
2. Processing Programs and versions - Applanix - POSGPS and POSProc, versions 4.4, MMS version 5.2
3. Program and version - Optech ASDA
4. Processing Programs and versions - TerraSolid TerraScan (version 012.016), TerraModeler (version 012.008) and TerraMatch (version 012.009), Intergraph MicroStation (version 08.05.02.55), and GeoCue (version 2011.1.20.4).
5. Viewing Program - GlobalMapper V13.00