Originator: U.S. Geological Survey
Topographic Lidar Survey of the Chandeleur Islands, Louisiana, February 6, 2012 -- Bare Earth DEMs
Geospatial_Data_Presentation_Form: remote-sensing image
Series_Name: U.S. Geological Survey Data Series
Publication_Place: St. Petersburg, Fla.
Publisher: U.S. Geological Survey
A topographic Lidar survey was conducted on February 6, 2012, over the Chandeleur Islands, Louisiana. The data were collected at a nominal pulse space of 0.5-meter (m) and processed to identify bare earth elevations. Bare earth digital elevation models (DEMs) were generated based on these data. Digital Aerial Solutions, LLC, was contracted by the U.S. Geological Survey (USGS) to collect and process the lidar data.
The bare earth DEMs are 32-bit floating point ERDAS Imagine (IMG) files with a horizontal spatial resolution of 1-m by 1-m. They are in decimal degree geographic coordinates, North American Datum 1983, National Spatial Reference System 2007 (NAD83 NSRS2007)). Their vertical datum is North American Vertical Datum 1988, Geoid 2009, Geodetic Reference System 1980 (NAVD88 GEOID09 GRS80) in meters. Thirty-three DEMs, based on a 2-kilometer (km) by 2-km tiling scheme, cover the entire survey area.
These lidar data are available to Federal, State and local governments, emergency-response officials, resource managers, and the general public.
This lidar survey was acquired to document the short- and long-term changes of several different barrier island systems. Specifically, this survey supports detailed studies of the Chandeleur Islands that resolve annual changes in beaches, berms and dunes associated with processes driven by storms, sea-level rise, and human restoration activities.
Lidar data acquisition, calibration, and follow-on processing were completed by Digital Aerial Solutions, LLC. Digital Aerial Solutions was contracted by the U.S. Geological Survey to conduct the work.
Each tile is 2000 m by 2000 m in size, based on UTM Zone 16N NAD83 meters. The extent of each tile falls on even 1000 x and y UTM Zone 16N NAD83 coordinates. Tile names are assigned according to the U.S. National Grid (USNG) spatial address (http://www.fgdc.gov/usng/how-to-read-usng/index_html)
. The last 4 digits of the file name are based on the lower-left (LL) xy coordinate of the tile. For example, tile name 16RCU2304 uses 23 to represent an LL x-coordinate of 323,000 (ignoring the first digit), and uses 04 to represent an LL y-coordinate of 3,304,000 (ignoring the first two digits).
Currentness_Reference: ground condition
Maintenance_and_Update_Frequency: None planned
Access_Constraints: No restrictions apply to these data.
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: remote sensing
Theme_Keyword: elevation data
Theme_Keyword: Digital Elevation Model
Theme_Keyword: laser altimetry
Theme_Keyword: bare earth
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: Chandeleur Islands
Place_Keyword: United States
None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgement 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
Hours_of_Service: Monday through Friday 9:00 AM to 5:00 PM (Eastern Time)
Address: 600 4th St. S.
City: St. Petersburg
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. The U.S. Geological Survey staff would also appreciate it if those products were shared with them. 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.
Microsoft Windows 7 Service Pack 2; ESRI ArcCatalog 22.214.171.1240; ArcMap 10; MicroStation V8; TeraScan v.11; TeraModel v.11.