Map service of the footprints (study area) of all lidar datasets from the USGS SPCMSC since 2001. In the web mapping application, the map service displays footprints by year as individual layers (Lidar Footprints) and all footprints merged into one layer (All Lidar Footprints). Data is symbolized in a dark purple (newest) to lighter purple (oldest) color ramp. Individual layers are labeled using their USGS Field Activity Number (FAN) and associated publication. Additional details can be found by following the publication links in the pop-up for each footprint, or in the layer's service description (https://olga.er.usgs.gov/server/rest/services/Seafloor/Lidar_Footprints/MapServer).
(Source: USGS SPCMSC)
- fan
- Acronym for 'Field Activity Number', which is a unique identifier given to data collected during field activities.
(Source: USGS SPCMSC)
Each FAN is a unique number given to data collected during a field activity. There are two common formats used for a FAN. The first is: ##XXX##. The first two digits represent the year the data were collected. The third through fifth digits represent the project identification information, coded by the USGS to be unique to each project. The last two digits represent the number of field activities in that year under that project code. The second format for a FAN is: ####_###_FA. The first four digits represent the year the data were collected and the second, 3-digit set represents numbers assigned to a specific USGS center (for example, USGS SPCMSC numbers begin at 301).
- pub
- Represents the source publication that the dataset is derived from.
(Source: USGS SPCMSC)
Data were published in USGS Data Series (DS), data releases (DR), or Open-File Reports (OFR), and serve as unique identifiers to find and access the data.
- pub_url
- Online linkage to the USGS publication used for the source datasets.
(Source: USGS SPCMSC)
All links navigate to a publication (DS, DR, or OFR) in the USGS Publications Warehouse.
- returntype
- Describes the type of lidar represented in the footprint.
(Source: USGS SPCMSC)
There are four lidar types used to generate the DEMs covered by the footprints: bare-earth, first-surface, ground-based, and submerged. Some datasets contain one or multiple types, which are sequentially listed in the attribute table, separated by commas. Bare earth is digital elevation data of the terrain; free from vegetation, buildings, and other man-made structures. First surface is the first significant measurable portion of a return lidar pulse, includes vegetation, buildings, and other manmade structures. Ground-based lidar refers to terrestrial lidar data acquisition. Submerged refers to lidar-derived topography for submerged environments.
- yr_collect
- Calendar year of the lidar data collection.
(Source: USGS SPCMSC)
This field indicates the year the lidar data were collected for each footprint.
Entity_and_Attribute_Overview:
Bathymetry DEMs - The USGS collects singlebeam, multibeam, and interferometric swath bathymetry data to characterize subsurface features and geology. This map service contains is a compilation of all the published bathymetry data from the USGS SPCMSC. Bathymetry data was processed to create gridded and interpolated digital depth surfaces, known as Digital Elevation Models (DEMs). The DEMs have been grouped by year and are labeled using their USGS Field Activity Number (FAN) and associated publication.
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Side-scan Sonar - The U.S. Geological Survey, with help from other agencies, has conducted geophysical surveys to investigate the geologic controls on barrier islands and other coastal zone features. This map service contains a compilation of all the published side-scan sonar data from the USGS SPCMSC. The side-scan sonar data was processed to create Georeferenced Backscatter Rasters (GeoBars). The mosaic images represent 1-meter pixel composites of these GeoBars, with each individual image shown at a single-scaled intensity. Mosaics are labeled using their USGS Field Activity Number (FAN) and associated publication.
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SPCMSC Geologic Core and Sample Database (Coral Samples, Coral Cores, Coral Reef Cores, Limestone Cores, Sediment Samples, Sediment Cores) - information on geologic cores and samples collected and/or published by or in collaboration with the USGS SPCMSC. Most of the samples were collected by USGS SPCMSC, but the database also includes samples collected by other agencies (federal, state, and university partners) in collaboration with the USGS. The database contains the geographic location where cores were collected, storage location, associated publications, data analyses, disposition, and archival information, if available.
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