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OAS accession Detail for 0169504
| << previous | |revision: 9 |
| accessions_id: | 0169504 | archive |
|---|---|
| Title: | Satellite-derived bathymetry for nearshore benthic habitats in Timor-Leste from 2010-02-09 to 2013-10-02 (NCEI Accession 0169504) |
| Abstract: | 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. |
| Date received: | 20171209 |
| Start date: | 20100126 |
| End date: | 20140810 |
| Seanames: | Indian Ocean, Timor Sea |
| West boundary: | 124 |
| East boundary: | 127.4 |
| North boundary: | -8.1 |
| South boundary: | -9.4 |
| Observation types: | derived products, GIS product, satellite photography |
| Instrument types: | satellite sensor - general |
| Datatypes: | BATHYMETRY, POSITION - GEOGRAPHIC, water depth |
| Submitter: | Kanemura, Troy |
| Submitting institution: | US DOC; NOAA; NMFS; Pacific Islands Fisheries Science Center; Ecosystem Sciences Division; Coral Reef Ecosystem Program |
| Collecting institutions: | US DOC; NOAA; NMFS; Pacific Islands Fisheries Science Center; Ecosystem Sciences Division; Coral Reef Ecosystem Program |
| Contributing projects: | CORAL REEF STUDIES, CRCP, CTI |
| Platforms: | |
| Number of observations: | |
| Supplementary information: | Submission Package ID: 2JLTN9 Contains Submission Package ID: CMW43B CMW43B Abstract: Inventory of satellite images from DigitalGlobe’s WorldView-2 satellite purchased by the NOAA Coral Reef Ecosystem Program for Timor-leste from Jan 26, 2010 to August 10, 2014. Images were acquired for purposes of deriving seafloor depths and benthic habitat classes for the nearshore waters ( |
| Availability date: | |
| Metadata version: | 9 |
| Keydate: | 2017-12-28 18:00:07+00 |
| Editdate: | 2019-04-07 20:54:05+00 |