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bag_hillshades (Map Service)


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Current Version: 10.81

Service Description:

This tile layer displays detailed color shaded relief visualizations of high-resolution quality-controlled seafloor elevation from NOAA National Ocean Service (NOS) Hydrographic Survey Bathymetric Attributed Grids (BAGs) in U.S. coastal waters. Many near-shore areas have been mapped at high resolution (often 1 meter or better). The depths are usually relative to Mean Lower Low Water (MLLW) datum. 

BAG is a non-proprietary file format for storing and exchanging bathymetric data developed by the Open Navigation Surface Working Group. BAG files are gridded, multi-dimensional bathymetric data files and is the standard NOS hydrographic data file for public release. Current versions of the BAG file contain position and depth grid data, as well as position and uncertainty grid data, and the metadata specific to that BAG file, providing end users information about the source and contents of the BAG file. The corresponding NOS Hydrographic Surveys map service displays the locations and coverage of the hydrographic surveys as polygons, along with additional metadata and links to obtain the data. 

This image service is available in 3 versions:
Tile Layer (overview of all surveys in a continuous image)
Note: this is a tiled image service, cached to zoom level 14.

Dynamic Image Service (overview of all surveys in a continuous image)


Subsets version (access to the underlying images; allows subsets using a definition query; maximum of 80 rasters displayed at a time)
 


The NCEI Bathymetric Data Viewer can be used to search and display these data. More information about NOS Hydrographic Survey data available at NCEI.

Below is the color scale used to represent depths (usually relative to Mean Lower Low Water): 

BAG hillshade color scale
 
 
Last update: Aug. 26, 2025


Map Name: Layers

Legend

All Layers and Tables

Layers: Description:

This tile layer displays detailed color shaded relief visualizations of high-resolution quality-controlled seafloor elevation from NOAA National Ocean Service (NOS) Hydrographic Survey Bathymetric Attributed Grids (BAGs) in U.S. coastal waters. Many near-shore areas have been mapped at high resolution (often 1 meter or better). The depths are usually relative to Mean Lower Low Water (MLLW) datum. 

BAG is a non-proprietary file format for storing and exchanging bathymetric data developed by the Open Navigation Surface Working Group. BAG files are gridded, multi-dimensional bathymetric data files and is the standard NOS hydrographic data file for public release. Current versions of the BAG file contain position and depth grid data, as well as position and uncertainty grid data, and the metadata specific to that BAG file, providing end users information about the source and contents of the BAG file. The corresponding NOS Hydrographic Surveys map service displays the locations and coverage of the hydrographic surveys as polygons, along with additional metadata and links to obtain the data. 

This image service is available in 3 versions:
Tile Layer (overview of all surveys in a continuous image)
Note: this is a tiled image service, cached to zoom level 14.

Dynamic Image Service (overview of all surveys in a continuous image)


Subsets version (access to the underlying images; allows subsets using a definition query; maximum of 80 rasters displayed at a time)
 


The NCEI Bathymetric Data Viewer can be used to search and display these data. More information about NOS Hydrographic Survey data available at NCEI.

Below is the color scale used to represent depths (usually relative to Mean Lower Low Water): 

BAG hillshade color scale
 
 
Last update: Aug. 26, 2025


Copyright Text: NOAA National Centers for Environmental Information (NCEI), National Ocean Service (NOS)

Spatial Reference:
102100

Single Fused Map Cache: true

Capabilities: Map,TilesOnly,Tilemap

Tile Info:
Initial Extent:
Full Extent:
Min Scale: 0.0
Max Scale: 0.0

Min LOD: 0
Max LOD: 14

Units: esriMeters

Supported Image Format Types: MIXED

Export Tiles Allowed: false
Max Export Tiles Count: 100000

Resampling: true

Document Info: