These data represent density per square meter of individuals of a suite of kelp and macroinvertebrate species on fixed 10-meter by 2-meter benthic transects on permanent subtidal monitoring sites around San Nicolas Island between 1980 and 2019. There are a total of nine sites, each of which has five 20 square meter band transects. Six of the sites were first sampled in 1980, one additional was added in 1987, and the other two were added in 2014. The sites have usually been monitored twice per year, most often in October and April. The target species list is as follows: Strongylocentrotus franciscanus (also known as Mesocentrotus franciscanus) Strongylocentrotus purpuratus Apostichopus parvimensis Pycnopodia helianthoides Patiria miniata Pisaster giganteus Astrometis sertulifera Dermasterias imbricata Haliotis corrugata Haliotis rufescens Megathura crenulata Megastraea undosa Cystoseira osmundacea (also known as Stephanocystis osmundacea) Eisenia arborea Laminaria spp. Macrocystis pyrifera <1 m tall Macrocystis pyrifera >1 m tall Pterygophora californica Young Laminariales (species uncertain) In fall 2014, the following additional organisms were added to the target list: Lytechinus anamesus Kelletia kelletii Crassadoma gigantea Aplysia californica Tealia lofotensis (also known as Urticina eques) Tethya aurantia (also known as Tethya aurantium) Sargassum horneri

These data represent holdfast diameters of giant kelp (Macrocystis pyrifera) that were greater than one meter tall and were on fixed 10-meter by 2-meter benthic transects on permanent subtidal monitoring sites around San Nicolas Island between 1980 and 2019. The number of stipes counted on the plants is also listed if recorded. Holdfast diameters give an indication of the M. pyrifera age structure because the holdfast continues to grow throughout the life of the alga. Stipe counts are more variable with age but give an indication of algal biomass. Stipe counts were made on some transects beginning in 1997 and on all plants beginning in 2014. Between 1980 and 2006, 3694 of the plants were tagged and followed over time. Tagged plants have been assigned unique identifier numbers so they can be tracked over multiple sampling periods. There are a total of nine sites, each of which has five 20 square meter band transects. Six of the sites were first sampled in 1980, one additional was added in 1987, and the other two were added in 2014. The sites have usually been monitored twice per year, most often in October and April.

These data represent counts of individuals of a suite of species counted in fixed 1-meter benthic quadrats on permanent subtidal monitoring sites around San Nicolas Island between 2014 and 2019. There are a total of nine sites, each of which has ten 1-meter square quadrats. These are the same quadrats used to asses benthic cover by point contact (see "San Nicolas Island benthic quadrat cover 1980-2019"). These counts began in 2014 and are supplemental to the counts made on 10 m x 2 m transects presented as densities in "San Nicolas Island benthic transect densities 1980-2019". The sites have usually been monitored twice per year, most often in October and April. The target species list is as follows: Styela montereyensis Tethya aurantia (also known as Tethya auantium and Tethya californiana) Tealia lofotensis (also known as Urticina eques) Cypraea spadicea (also known as Neobernaya spadicea) Lithopoma gibberosa (also known as Pomaulax gibberosus) Kelletia kelletii Tegula regina Norrisia norrisi Sargassum horneri

These data represent sizes of individuals of the sea urchin species Strongylocentrotus franciscanus (also known as Mesocentrotus franciscanus) and Strongylocentrotus purpuratus on permanent subtidal monitoring sites around San Nicolas Island between 2014 and 2019. The sites usually have been monitored twice per year, most often in October and April. Divers measured in situ urchin test diameters in millimeters. Approximately 200 individuals of each of the two species was measured at each supersite (pair of adjacent sites) during a sampling period.

In 2006 and 2007 the NOAA Office for Coastal Management purchased services to process existing digital multi-spectral imagery (ADS-40) and create digital benthic habitat data from this imagery for selected Texas coastal bend bays. The Center worked cooperatively with the Texas Parks and Wildlife Department (TPWD) and the Texas A and M University Center for Coastal Studies to develop benthic habitat data, primarily Submerged Aquatic Vegetation (SAV) for several coastal bays. This data will support the state's recently adopted Seagrass Monitoring Program which calls for regional mapping of SAV for status and trends assessment. The Center, Texas A and M, and TPWD have coordinated on the requirements of this project. Original contact information: Contact Org: NOAA Office for Coastal Management Phone: 843-740-1202 Email: coastal.info@noaa.gov

This dataset has been developed for the National Oceanic and Atmospheric Administration's (NOAA) Office for Coastal Management (OCM) as a collaborative and cooperative project with the California State Coastal Conservancy (SCC) on behalf of the Ocean Protection Council (OPC) to collect and delineate habitat data in the San Francisco Bay area. Data is intended for use in coastal management decision making, including applications such as sea level rise. The mission of the Center is to support the environmental, social, and economic well-being of the coast by linking people, information, and technology. Original contact information: Contact Org: NOAA Office for Coastal Management Phone: (843)740-1202 Email: coastal.info@noaa.gov

These data represent benthic habitats in a coastal area near Green Bay, Wisconsin. The area extends approximately 91 kilometers between Suamico, Wisconsin, and Menominee, Michigan, and covers approximately 64 square kilometers. Benthic biota and substrates were classified using the Coastal and Marine Ecological Classification Standard (CMECS). The classification process involved object-based image segmentation of lidar bathymetry, cross-referencing geospatial data with the CMECS hierarchy, and expert interpretation. Biotic and substrate components were classified to the CMECS group or community level, with additional detail provided by co-occurring elements and modifiers. Mapping confidence was higher in areas with Digital Elevation Models (DEMs), as geomorphometric details from digital elevation models could often be directly linked to substrate types through professional geologic judgment. In areas lacking DEM coverage, object-based segmentation was not possible, leading to lower confidence and requiring manual interpretation of substrate and biotic data from available source and ancillary data. In some instances, with support from geologic judgment or imagery, CMECS Substrate Component classifications at DEM boundaries were linearly extrapolated across gaps in DEM coverage. The layers available within the data download include biotic, confidence, and substrate. Partners: Coastal States Organization

Data produced for the Florida Fish and Wildlife Conservation Commission's Florida Marine Research Institute (FMRI) in partnership with the South Florida Water Management District (SFWMD). This data set consists of digital data describing the seagrass, unvegetated bottom, open water, algal beds, oysters, and apparent shoreline for the Southwest Florida Seagrass project area,which consists of Pine Island Sound, Matlacha Pass, San Carlos Bay, the lower Caloosahatchee River, and Estero Bay, in 1999. The data set includes an ArcInfo coverage that was digitized from 1:24000 scale natural color aerial photographs that were photogrammetrically georeferenced utilizing GPS ground control points. Data was stereoscopically photointerpreted and digitized using a Zeiss P3 analytical stereoplotter. The seagrass beds and additional categories were classified according to the FDOT Florida Land Use, Cover and Forms Classification System (FLUCCS). Minimum mapping unit (mmu) for all classes was 0.25 acres. A Photointerpretation Key was developed to aid in the classification of collected data. Ground truthing was performed during the photointerpretation phase to ensure classification accuracy and consistency of PI. Digital files were created in Microstation design file format (.dgn). 1999 SWIM Seagrass data was translated from ARC/Info to .dgn format and was referenced as collateral tie information during the compilation process. These data were collected under a cooperative mapping program between the U.S. Geological Survey (USGS), the National Oceanic and Atmospheric Administration Office for Coastal Management (NOAA\OCM), and the Apalachicola National Estuarine Research Reserve (NERR). The primary objectives of this program were to collect marine geophysical data to develop a suite of seafloor maps to better define the extent of oyster habitats, the overall seafloor geology of the bay and provide updated information for management of this resource. In addition to their value for management of the bay's oyster resources, the maps also provide a geologic framework for scientific research and the public. Original contact information: Contact Org: NOAA Office for Coastal Management Phone: 843-740-1202 Email: coastal.info@noaa.gov

In 2006 and 2007 the NOAA Office for Coastal Management purchased services to process existing digital multi-spectral imagery (ADS-40) and create digital benthic habitat data from this imagery for selected Texas coastal bend bays. The Center worked cooperatively with the Texas Parks and Wildlife Department (TPWD) and the Texas A and M University Center for Coastal Studies to develop benthic habitat data, primarily Submerged Aquatic Vegetation (SAV) for several coastal bays. This data will support the state's recently adopted Seagrass Monitoring Program which calls for regional mapping of SAV for status and trends assessment. The Center, Texas A and M, and TPWD have coordinated on the requirements of this project. Original contact information: Contact Org: NOAA Office for Coastal Management Phone: 843-740-1202 Email: coastal.info@noaa.gov

In 2006 and 2007 the NOAA Office for Coastal Management purchased services to process existing digital multi-spectral imagery (ADS-40) and create digital benthic habitat data from this imagery for selected Texas coastal bend bays.The Center worked cooperatively with the Texas Parks and Wildlife Department (TPWD) and the Texas A and M University Center for Coastal Studies to develop benthic habitat data, primarily Submerged Aquatic Vegetation(SAV) for several coastal bays. This data will support the state's recently adopted Seagrass Monitoring Program which calls for regional mapping of SAV for status and trends assessment. The Center, Texas A and M, and TPWD have coordinated on the requirements of this project. Original contact information: Contact Org: NOAA Office for Coastal Management Phone: 843-740-1202 Email: coastal.info@noaa.gov