Data · collection
Satellite-derived bathymetry for nearshore benthic habitats in Timor-Leste from 2010-02-09 to 2013-10-02 (NCEI Accession 0169504)
Listed in NASA Earthdata CMR
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.
Description
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.
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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.
Links
Get the data
- ncei.noaa.gov /archive/accession/oas/169504 ↗
Navigate directly to the URL for a descriptive web page with download links.
download · from NASA CMR
- ftp-oceans.ncei.noaa.gov /nodc/archive/arc0117/0169504 ↗
These data are available through the File Transfer Protocol (FTP). You may use any FTP client to download these data.
download · from NASA CMR
- ncei.noaa.gov /archive/accession/download/169504 ↗
Navigate directly to the URL for data access and direct download.
download · from NASA CMR
- ncei.noaa.gov /archive/accession/0169504 ↗
Navigate directly to the URL for a descriptive web page with download links.
download · from NASA CMR
Documentation and papers
- NOAA Technical Memorandum pifsc.noaa.gov/library/pubs/tech/NOAA_Tech_Memo_PIFSC_46.pdf ↗
documentation · from NASA CMR
- InPort Metadata Record fisheries.noaa.gov/inport/item/46150 ↗
documentation · from NASA CMR
- PIFSC Special Publication SP-17-02 ftp.library.noaa.gov/noaa_documents.lib/NMFS/PIFSC/PIFSC_special_publication/SP-17-… ↗
documentation · from NASA CMR
- noaa.sirsi.net /uhtbin/cgisirsi/x/0/0/57/5/3?searchdata1=ocn990302338%7B001%7D… ↗
NOAA Central Library: 1 online resource (234 pages); PDF file, color illustrations, color maps
documentation · from NASA CMR
- Institution web page lib.noaa.gov ↗
documentation · from NASA CMR
- Preview graphic ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc%3A0169504 ↗
preview image · from NASA CMR
Catalogue records · 2
- CMR record cmr.earthdata.nasa.gov/search/concepts/C2089379442-NOAA_NCEI.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C2089379442-NOAA_NCEI.umm_json ↗
metadata API · from NASA CMR
Topics
- Stated by source
- Bathymetry · Not provided · satellite sensor - general · Water Depth
- Inferred from text
- Image 75% · Satellite remote sensing 65%
Provenance · 1 source records, 13 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C2089379442-NOAA_NCEI | 13 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[instrument].gcmd_instrument:satellite-sensor-general | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/bathymetry-seafloor-topography/bathymetry | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/bathymetry-seafloor-topography/water-depth | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[modality].local:modality:image | enrichment · NASA CMR | keyword-concept-rules@1.0.0 | title+description (75%) |
| concepts[modality].local:modality:remote-sensing | enrichment · NASA CMR | keyword-concept-rules@1.0.0 | title+description (65%) |
| concepts[platform].gcmd_platform:not-provided | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| license_text | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |