Satellite-derived bathymetry for nearshore benthic habitats in the Pacific Remote Islands Marine National Monument

Bathymetric data derived from multispectral, high-resolution (2 m) satellite imagery acquired between 2011 and 2016 from Digital Globe’s WorldView-2 or WorldView-3 satellite to provide near complete coverage of nearshore terrain around several islands and atolls in the Pacific Remote Islands Marine National Monument, including Wake, Jarvis, Baker, and Howland islands, Johnston and Palmyra atolls, and Kingman reef . Methods used to estimate depths from WorldView imagery were adapted from instructions developed by Kyle Hogrefe for using IKONOS imagery to derive seafloor elevations in optically clear water (Ehses and Rooney 2015).

Bathymetry values shallower than ~30 m were derived by gauging the relative attenuation of coastal, blue, green and yellow spectral radiance as a function of depth. A multiple linear regression analysis of coastal, blue, green and yellow band spectral values against in-situ depth determined the variables of y-intercept, coastal, blue, green and yellow slope values. The variables for each band were then used in a multivariate slope intercept equation to derive depth over the imagery. Variables and combinations of the bands were adjusted to improve the statistical accuracy and spatial coverage of the final derived bathymetry product for each location. Digital image processing to derive depths was conducted with ENVI (v4.8-5.3), and editing and integration was performed using ArcGIS 10.x.

The method assumes uniform water clarity but deviations from that condition made extraction difficult in water depths greater than 30 m. Results show that biotic material, or sediment in the water column skewed results shallower if the material has a high albedo and deeper if the material has a low albedo.

The satellite-derived bathymetry maps and associated data and documentation are accessible online via the Pacific Islands Benthic Habiat Mapping Center (PIBHMC) website at http://www.soest.hawaii.edu/pibhmc/cms/data-by-location/pacific-remote-island-area/.

Data and Resources

Additional Info

Field Value
Last Updated August 6, 2019, 05:56
Created June 21, 2019, 23:56
access_constraints ["Access Constraints: none | Use Constraints: These data are not to be used for navigation purposes. \n\nPlease cite NOAA Coral Reef Ecosystem Program (CREP) when using the data.\n\nSuggested citation:\n\nCoral Reef Ecosystem Program; Pacific Islands Fisheries Science Center (2017). Satellite-derived bathymetry for nearshore benthic habitats in the Pacific Remote Islands Marine National Monument. Pacific Islands Benthic Habitat Mapping Center, https://inport.nmfs.noaa.gov/inport/item/35775. [access date] | Distribution Liability: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty."]
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contact-email annette.desrochers@noaa.gov
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guid gov.noaa.nmfs.inport:35775
licence ["NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose."]
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