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bathy_gap_analysis (MapServer)

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Service Description: The United States Bathymetry Gap Analysis is a map service providing visual access to the local sounding density derived from all modern bathymetric data holdings at NOAA's National Centers for Environmental Information (NCEI) and Office for Coastal Management (OCM). A team from NOAA's Office of Coast Survey, the University of New Hampshire Center for Coastal and Ocean Mapping/Joint Hydrographic Center, and NCEI - Colorado prepared this analysis and map service to inform a U.S. ocean and coastal mapping strategy for U.S. waters and contribute to the international Seabed 2030 initiative, which aims to map the entire ocean floor at 100 meter resolution by 2030.

Underpinning the map service are six principal layers of bathymetry. Actual soundings of multibeam data (raw), single beam data (1960 or later), and NOS hydrographic surveys (1960 or later) are included. Coverage footprints of NOS BAG-formatted hydrography, bathymetric grids from the U.S. extended continental shelf survey program, and bathymetric LIDAR data are also included. All bathymetry layers used in the gap analysis are archived at NCEI. For convenience, footprints of bathymetric LIDAR data were retrieved from NOAA's Digital Coast.

To effectively manage server resources, the analysis is partitioned across 177 tiles covering all U.S. waters and adjacent continental shelf. Each tile spans 6 degrees in longitude and 4 degrees in latitude. Within this framework, all modern depth soundings or coverage footprints are extracted from NCEI and OCM data holdings and associated with an approximately 100-m resolution grid of the area. MB_System, GDAL, GMT, and Esri ArcGIS software are used to prepare this analysis.

To simplify the visual presentation and accommodate evolving views on the number of soundings needed for a single 100 m cell to be "mapped", the number of soundings for each grid tile are divided into categories of coverage. Sounding densities greater than 0 and less than 3 are reclassed to a value of 1 and displayed as a deep pink color. Sounding densities equal to 3 or greater are reclassed to a value of 3 and displayed as a deep purple color. The coverage footprints obtained from the BAG-formatted hydrography, offshore extended continental shelf grids, and nearshore bathymetric LIDAR were populated with a value of 3, which represents "fully mapped" in this bathymetry coverage and gap analysis.

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Copyright Text: NOAA Office of Coast Survey (OCS), University of New Hampshire Center for Coastal and Ocean Mapping/Joint Hydrographic Center, NOAA National Centers for Environmental Information (NCEI), NOAA Office for Coastal Management (OCM)

Spatial Reference: 4326  (4326)


Single Fused Map Cache: false

Initial Extent: Full Extent: Units: esriDecimalDegrees

Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP

Document Info: Supports Dynamic Layers: true

MaxRecordCount: 1000

MaxImageHeight: 4096

MaxImageWidth: 4096

Supported Query Formats: JSON, AMF, geoJSON

Min Scale: 0

Max Scale: 0

Supports Datum Transformation: true



Child Resources:   Info   Dynamic Layer

Supported Operations:   Export Map   Identify   QueryDomains   Find   Return Updates