Satellite-derived bathymetry for nearshore benthic habitats in Timor-Leste from 2010-02-09 to 2013-10-02 (NCEI Accession 0169504)
Bathymetric data derived from multispectral, high-resolution (2 m) satellite imagery from DigitalGlobe's WorldView-2 satellite to provide near complete coverage of nearshore terrain along the northern coastline of Timor-Leste, including the district of Oecusse to the west of mainland Timor-Leste and Atauro Island. Satellite images acquired by the NOAA Coral Reef Ecosystem Program (CREP) for the region are from Jan 26 2010 to August 10, 2014. Methods used by CREP to estimate depths from the 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 ~20 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. Digital image processing to derive depths was conducted with ENVI, and editing and integration was performed using Esri's ArcGIS.
The method assumes uniform water clarity but deviations from that condition made extraction difficult in water depths greater than 20 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.
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| description | Bathymetric data derived from multispectral, high-resolution (2 m) satellite imagery from DigitalGlobe's WorldView-2 satellite to provide near complete coverage of nearshore terrain along the northern coastline of Timor-Leste, including the district of Oecusse to the west of mainland Timor-Leste and Atauro Island. Satellite images acquired by the NOAA Coral Reef Ecosystem Program (CREP) for the region are from Jan 26 2010 to August 10, 2014. Methods used by CREP to estimate depths from the 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 ~20 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. Digital image processing to derive depths was conducted with ENVI, and editing and integration was performed using Esri's ArcGIS. The method assumes uniform water clarity but deviations from that condition made extraction difficult in water depths greater than 20 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. |
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| identifier | gov.noaa.nodc:0169504 |
| issued | 2017-12-28T00:00:00.000+00:00 |
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[
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"BATHYMETRY",
"POSITION - GEOGRAPHIC",
"water depth",
"satellite sensor - general",
"derived products",
"GIS product",
"satellite photography",
"Coral Reef Ecosystem Program",
"Coral Reef Ecosystem Program",
"Coral Reef Conservation Program (CRCP)",
"CORAL REEF STUDIES",
"Coral Triangle Initiative (CTI)",
"Indian Ocean",
"Timor Sea",
"oceanography",
"CRED",
"CREP",
"Coral Reef Ecosystem Division",
"Coral Reef Ecosystem Program",
"PIFSC",
"Pacific Islands Fisheries Science Center",
"DOC/NOAA/NMFS > National Marine Fisheries Service, NOAA, U.S. Department of Commerce",
"Geographic Information > Bathymetry",
"Geographic Information > Habitats",
"EARTH SCIENCE > Biosphere > Aquatic Habitat > Benthic Habitat",
"EARTH SCIENCE > Biosphere > Aquatic Habitat > Coastal Habitat",
"EARTH SCIENCE > Biosphere > Aquatic Habitat > Reef Habitat",
"EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > GIS",
"EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Mapping",
"EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Mapping > Base map",
"EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Mapping > Base map > Hyper/multispectral Imagery",
"EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Mapping > Base map > Satellite Imagery",
"EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Remote Sensing",
"EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Remote Sensing > Satellite (digital scans) > WorldView-2",
"EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry",
"EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Water Depth",
"EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs",
"EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY",
"EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > WATER DEPTH",
"Pseudobathymetry",
"derived depths",
"estimated depths",
"seafloor elevation",
"COUNTRY/TERRITORY > Democratic Republic of Timor-Leste (East Timor) (09S126E0001)",
"OCEAN BASIN > Indian Ocean > Timor Sea > Democratic Republic of Timor-Leste (East Timor) (09S126E0001)",
"OCEAN > INDIAN OCEAN",
"OCEAN > PACIFIC OCEAN > WESTERN PACIFIC OCEAN > SOUTH CHINA AND EASTERN ARCHIPELAGIC SEAS",
"Atauro",
"Baucau",
"Bobonaro",
"Dili",
"Jaco",
"Lautem",
"Liquica",
"Manatuto",
"Oecusse",
"Timor",
"Timor-leste",
"Vila MPA",
"VERTICAL LOCATION > SEA FLOOR",
"2JLTN9",
"CMW43B"
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| language |
[]
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| license | https://creativecommons.org/publicdomain/zero/1.0/ |
| modified | 2018-03-10T00:00:00.000+00:00 |
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"https://www.fisheries.noaa.gov/inport/item/46150",
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|
| rights | otherRestrictions |
| spatial | 127.4,-9.4,124.0,-8.1 |
| temporal | 2010-01-26T00:00:00+00:00/2014-08-10T00:00:00+00:00 |
| title | Satellite-derived bathymetry for nearshore benthic habitats in Timor-Leste from 2010-02-09 to 2013-10-02 (NCEI Accession 0169504) |
