Derived bathymetry from IKONOS satellite imagery of nearshore benthic habitats

Methods used were adapted from a "cookbook" of instructions developed by Kyle Hogref

for using IKONOS imagery data to derive seafloor elevations in optically clear

water. This dataset was derived from high-resolution (2 m) imagery from DigitalGlobe's

WorldView-2 sensor of the Kaanapali area of Maui, Hawaii. Sensor bands 1,2

and 5 (coastal, blue and near IR respectively) were used to derive depth information.

The method assumes uniform water clarity but deviations from that condition

made extraction difficult in water greater than 30 m depth in the Kaanapali scene

used. 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. Nearshore areas were significantly less impacted in the Kaanapali area,

due to the geomorphology of the area and the hi resolution and quality of the imagery,

allowing visual descrimination of apparent sediment in the water column.

For presentation purposes the map product shows an Inverse Distance Weighted interpolated

bathymetry surface, restricted to data within 600 m of the shoreline.

DG WorldView-2 data are used as the base imagery to derived pseudobathymetry of the

Kaanapali area of Maui. This area has both SHOALS and multi-beam acoustic derived

bathymetry coverage and will provide an example case of the strengths and

weaknesses of pseudobathymetry extraction from high resolution satellite imagery methods.

FGDC upload, AMD 2015-06-08

Kaanapali, Maui, Hawaii

Loaded by FGDC Metadata Uploader, batch 6158, 06-08-2015 17:49

The following FGDC sections are not currently supported in InPort, but were preserved and will be included in the FGDC export:

- Spatial Reference Information (FGDC:spref),

- Spatial Data Organization Information (FGDC:spdoinfo)

LiDAR bathymetry of Kaanapali, Maui from Scanning Hydrographic Airborne Operational

LiDAR data from the United States Army Corps of Engineers Joint Airborne LiDAR

Bathymertry Technical Center for Expertise. Multibeam sonar data from the

Main Hawaiian Islands Bathymetry synthesis maintained by the Hawaii Mapping Research Group

at the University of Hawaii, School of Ocean and Earth Science and Technology.

Depth values are real values based on the average of the

soundings that fell within the extracted grid cells. The number

of soundings per grid cell range from >1000 soundings in shallow

depths to as few as 20 soundings in deeper areas. A total error

budget for these data have not been developed. Therefore, the

accuracy of depth measurements should be considered to be within

1 meter.

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These data are not to be used for navigational purposes.

NOAA makes no warranty regarding these data, expressed or

implied, nor does the fact of distribution constitute such a

warranty. NOAA cannot assume liability for any damages caused by

any errors or omissions in these data, nor as a result of the

failure of these data to function on a particular system.

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NOAA Coral Reef Ecosystem Program (CREP) Data Sharing Recommendations, version 9.0 updated August 12, 2015:

CREP welcomes the opportunity to collaborate on research issues contributing to the scientific basis for better management of marine ecosystems. CREP has a very diverse set of field activities that generates large volumes of data using an array of data collection protocols.

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4) Those receiving data are strongly urged to inform the CREP Data Management Team of any errors and discrepancies that are discovered during the course of using these data. They are further urged to bring to the attention of the Team all problems and difficulties encountered in using these data. This information is necessary in order to improve the collections and to facilitate more efficient and economical data processing and retrieval. The users are asked to supply copies of any missing data that may be located, and to provide information as to significant subsets and special aggregations of data that are developed in using the material provided.

Example citation:

"This publication makes use of data products provided by the Coral Reef Ecosystem Program (CREP), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), with funding support from the United States Agency for International Development (USAID). The analysis and interpretations presented here are solely that of the current authors.”

Data can be accessed online via the NOAA National Centers for Environmental Information (NCEI) Ocean Archive, accession #.

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These data are not to be used for navigation purposes. Please acknowledge the NOAA Pacific Islands Fisheries Science Center,

and the Joint Institute for Marine and Atmospheric Research (JIMAR) and Hawaii

Mapping Research Group (HMRG) at the University of Hawaii as the sources of

this information.

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netCDF file created using the Generic

Mapping Tools (GMT) and ArcGIS ASCII file, both created in a

LINUX environment

Data are collected for resource

management and research purposes and are examined for internal

consistency; however, no effort is made to compare these data to

external references or to other published data.

Complete

These data are believed to be logically

consistent though no tests were performed

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NOAA IRC and NOAA Fisheries ITS resources and assets.