46150 Timor: WV-2 Bathymetry Data Set Published / External 27416 Timor Leste Project Completed 2017 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 Feb 9, 2010 to October 2, 2013. 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. In 2011, NOAA and the United States Agency for International Development (USAID) Timor-Leste Mission formed a 5-year bi-lateral partnership agreement from 2012 to 2016, in support of the Government of Timor-Leste—particularly the Ministry of Agriculture and Fisheries (MAF)—by addressing significant information gaps in their nearshore marine ecosystems. Specifically, MAF asked NOAA to address the following questions: 1. Where are the nearshore marine resources? 2. What are the nearshore marine resources? 3. How are they changing over time and what threats are potentially causing these changes? 4. What approaches are needed to manage and conserve the nearshore marine resources? With financial support from USAID and in-kind support from the NOAA Coral Reef Conservation Program (CRCP), the NOAA Coral Reef Ecosystem Program (NOAA-CREP) conducted baseline ecosystem assessment surveys to inform ecosystem-based management planning in Timor-Leste. The primary activities conducted by NOAA to answer these questions included: 1. satellite mapping of nearshore habitats, 2. conducting coral reef ecosystem assessments, 3. establishing ecological baselines for climate change, and 4. building management capacity by developing a spatial data framework The bathymetry data described herein resulted from the first activity to conduct satellite mapping for the nearshore waters around Timor-Leste. Pacific Islands Fisheries Science Center. 2017. Interdisciplinary baseline ecosystem assessment surveys to inform ecosystem-based management planning in Timor-Leste: Final Report. Pacific Islands Fisheries Science Center, PIFSC Special Publication, SP-17-002, 234 p. https://doi.org/10.7289/V5/SP-PIFSC-17-002. The method to derive depths from WorldView-2 satellite imagery is documented in the following NOAA publication: Ehses, J. S., and J. J. Rooney. 2015. Depth derivation using multispectral WorldView-2 satellite imagery. U.S. Dep. Commer., NOAA Tech. Memo., NOAA-TM-NMFS-PIFSC-46, 24 p. doi:10.7289/V5668B40 Theme ISO 19115 Topic Category elevation Theme CoRIS Discovery Thesaurus Geographic Information > Bathymetry Theme CoRIS Theme Thesaurus EARTH SCIENCE > Biosphere > Aquatic Habitat > Benthic Habitat Theme CoRIS Theme Thesaurus EARTH SCIENCE > Biosphere > Aquatic Habitat > Coastal Habitat Theme CoRIS Theme Thesaurus EARTH SCIENCE > Biosphere > Aquatic Habitat > Reef Habitat Theme CoRIS Theme Thesaurus EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > GIS Theme CoRIS Theme Thesaurus EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Mapping Theme CoRIS Theme Thesaurus EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Mapping > Base map Theme CoRIS Theme Thesaurus EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Remote Sensing Theme CoRIS Theme Thesaurus EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Remote Sensing > Satellite (digital scans) > WorldView-2 Theme CoRIS Theme Thesaurus EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry Theme CoRIS Theme Thesaurus EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Water Depth Theme CoRIS Theme Thesaurus EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs Theme NODC DATA TYPES THESAURUS BATHYMETRY Theme NODC DATA TYPES THESAURUS water depth Theme NODC OBSERVATION TYPES THESAURUS GIS product Theme NODC OBSERVATION TYPES THESAURUS derived products Theme NODC PROJECT NAMES THESAURUS CORAL REEF STUDIES Theme NODC PROJECT NAMES THESAURUS Coral Triangle Initiative Theme NODC SUBMITTING INSTITUTION NAMES THESAURUS US DOC; NOAA; NMFS; Pacific Islands Fisheries Science Center; Ecosystem Sciences Division; Coral Reef Ecosystem Program Theme CRED Theme CREP Theme Coral Reef Ecosystem Division Theme Coral Reef Ecosystem Program Theme PIFSC Theme Pacific Islands Fisheries Science Center Theme Pseudobathymetry Theme USAID Theme United States Agency for International Development Theme derived depths Theme estimated depths Theme seafloor elevation Spatial CoRIS Place Thesaurus COUNTRY/TERRITORY > Democratic Republic of Timor-Leste (East Timor) (09S126E0001) Spatial CoRIS Place Thesaurus OCEAN BASIN > Indian Ocean > Timor Sea > Democratic Republic of Timor-Leste (East Timor) (09S126E0001) Spatial NODC SEA AREA NAMES THESAURUS Indian Ocean Spatial NODC SEA AREA NAMES THESAURUS Timor Sea Spatial Atauro Spatial Baucau Spatial Bobonaro Spatial Dili Spatial Jaco Spatial Lautem Spatial Liquica Spatial Manatuto Spatial Oecusse Spatial Timor Spatial Timor-leste Spatial Vila MPA Stratum Global Change Master Directory SEA FLOOR Pacific Islands Fisheries Science Center Honolulu HI USA Data Set GIS dataset of raster files None Planned Map (digital) Bathymetry raster files, in geotiff format, derived from WorldView-2 satellite imagery from coastal waters of Timor-Leste. Pixel values reflect the estimated depth in meters. 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. PIFSC Coral Reef Ecosystem Program and funded by the United States Agency for International Development Not applicable Not applicable Not applicable 50702 Published / External Completed Bathymetry derived from worldview-2 satellite imagery for Timor-Leste Data Table Yes Depths in meters derived from WorldView-2 satellite imagery for Timor-Leste VALUE NUMERIC No No Active Pixel values reflect the estimated depth in meters. Data Steward 2025-11-12 Person Akridge, Michael W michael.akridge@noaa.gov 1845 Wasp Blvd. Honolulu HI 96818 USA (808)725-5483 Data Steward 2012 Person Acoba, Tomoko S tomoko.acoba@noaa.gov 1845 Wasp Blvd. Honolulu HI 96818 USA (808)725-5448 8:00 am - 4:00 pm HST email preferred Distributor 2017 Organization NOAA National Centers for Environmental Information NCEI ncei.info@noaa.gov https://ror.org/04r0wrp59 https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. Online Resource Distributor 2015 Organization Pacific Islands Fisheries Science Center PIFSC pifsc.info@noaa.gov https://ror.org/02apffz65 1845 Wasp Blvd. Honolulu HI 96818 USA 808-725-5360 https://www.pifsc.noaa.gov Pacific Island Fisheries Science Center homepage Online Resource 8:00 a.m. - 4:30 p.m. Distributor 2012 2017 Person DesRochers, Annette M annette.desrochers@noaa.gov 1845 Wasp Blvd. Honolulu HI 96818 USA (808)725-5461 8 am - 5 pm email preferred Metadata Contact 2025-11-12 Person Akridge, Michael W michael.akridge@noaa.gov 1845 Wasp Blvd. Honolulu HI 96818 USA (808)725-5483 Metadata Contact 2012 Person DesRochers, Annette M annette.desrochers@noaa.gov 1845 Wasp Blvd. Honolulu HI 96818 USA (808)725-5461 8 am - 5 pm email preferred Originator 2012 Organization Pacific Islands Fisheries Science Center PIFSC pifsc.info@noaa.gov https://ror.org/02apffz65 1845 Wasp Blvd. Honolulu HI 96818 USA 808-725-5360 https://www.pifsc.noaa.gov Pacific Island Fisheries Science Center homepage Online Resource 8:00 a.m. - 4:30 p.m. Point of Contact 2025-11-12 Person Akridge, Michael W michael.akridge@noaa.gov 1845 Wasp Blvd. Honolulu HI 96818 USA (808)725-5483 Point of Contact 2012 Person DesRochers, Annette M annette.desrochers@noaa.gov 1845 Wasp Blvd. Honolulu HI 96818 USA (808)725-5461 8 am - 5 pm email preferred Ground Condition Timor-Leste 124 127.4 -8.1 -9.4 The northern coastline of mainland Timor-leste, as well as the coastlines of Oecusse district and Atauro Island. Range 2010-02-09 2013-10-02 Time span of satellite images acquired from DigitalGlobe, Inc. used for deriving bathymetry Unclassified Not applicable Not applicable 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. The following recommendations are for your consideration as you use this data: 1) Data analyses should take all field exigencies into account. The most effective way to do this would be active collaboration with CREP principal investigators. 2) In all presentations, product releases, or publications using data generated by CREP, proper acknowledgement of both CREP and the individuals responsible for data collection is expected. Citing the DOI (if available) is preferred, a non-DOI example is listed below. 3) If you collect or generate data for the same study areas, CREP requests that you share relevant information on complimentary data collections. 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 None Please cite NOAA Coral Reef Ecosystem Program (CREP) when using the data. Example Coral Reef Ecosystem Program; Pacific Islands Fisheries Science Center (2017). Satellite-derived bathymetry for nearshore benthic habitats in Timor-Leste. NOAA's National Centers for Environmental Information. Dataset. https://www.fisheries.noaa.gov/inport/item/46150 None None https://accession.nodc.noaa.gov/0169504 2017 Organization NOAA National Centers for Environmental Information https://ror.org/04r0wrp59 Bathymetry_Timor.zip GeoTiff raster bathymetry data for nearshore waters of Timor Leste, derived from WorldView-2 satellite imagery. The bathymetry data are organized by region (north shore, Atauro Island, and Oecusse), and each region contains 1) the individual final bathymetry files (one geoTiff for each satellite image), 2) a projected (UTM_Zone_51S) bathymetry mosaic for the region, and 3) an unprojected (WGS84) mosaic for the region. The mosaics are also in geoTiff format. An ESRI layer file is included within each region's subfolder for ease of displaying the geoTiffs in ESRI's ArcGIS software. The symbology is based on the VALUE field. 2017-06-14T00:00:00 GeoTIFF GeoTIFF https://accession.nodc.noaa.gov/0169504 2017 Organization NOAA National Centers for Environmental Information https://ror.org/04r0wrp59 README.ZIP README folder contains the README.txt files for each final bathymetry geoTiff produced for the three regions (north shore, Atauro Island, and Oecusse) of Timor-Leste. Each README.txt file contains specific details for each geoTiff generated. Text Text (Unstructured) https://www.pifsc.noaa.gov/library/pubs/tech/NOAA_Tech_Memo_PIFSC_46.pdf 2015 Organization Pacific Islands Fisheries Science Center https://ror.org/02apffz65 NOAA_Tech_Memo_PIFSC_46.pdf Depth Derivation Using Multispectral WorldView-2 Satellite Imagery, a NOAA tech memo published by the Pacific Islands Fisheries Science Center. The Tech Memo is also available in the NOAA Repository. 2015-06-17T00:00:00 PDF PDF - Adobe Portable Document Format https://www.coris.noaa.gov/activities/projects/timor-leste/images/bathymetry.jpg Browse Graphic JPG An example of the bathymetry data generated for Timor-Leste from WorldView-2 satellite imagery. https://dg-cms-uploads-production.s3.amazonaws.com/uploads/document/file/35/DG-8SPECTRAL-WP_0.pdf Online Resource PDF DigitalGlobe. 2010. The Benefits of the Eight Spectral Bands of WorldView-2. https://dg-cms-uploads-production.s3.amazonaws.com/uploads/document/file/98/WorldView2-DS-WV2-rev2.pdf Online Resource PDF WorldView-2 Data Sheet https://www.coris.noaa.gov/activities/projects/timor-leste/ Online Resource HTML Timor-Leste project portal on the NOAA Coral Reef Information Service website where NOAA's final report for Timor-Leste and the datasets generated by NOAA CREP as part of the project can be downloaded. https://www.pifsc.noaa.gov/cred/coral_triangle_initiative.php Online Resource PHP Information about the NOAA Coral Reef Ecosystem Program's activities in the Coral Triangle. ENVI was used to process the satellite images, and maps and data were developed using ArcGIS. Spatial reference was UTM Zone 51S. Timor-Leste project on PIFSC network: \\picGoldFish\General\ProjectGroup\Coral Triangle\Timor Leste\Spatial_Data_Framework\ The program Microsoft Excel was used for the multiple linear regression analysis to provide original variables for depth derivation. The multivariate slope intercept formula used to derive depth was Depth=Yint+(Mcoastal)(Xcoastal)+(Mblue)(Xblue)+(Mgreen)(Xgreen)+(Myellow)(XYellow). Multiple linear regression analysis using subsampled athymetry validation points. Nearshore waters along the entire coastline of Timor-Leste have complete coverage of WorldView-2 satellite imagery. There are, however, holes in derived depths resulting from areas of high water column turbidity, clouds, whitewater, etc. that were masked out of the analyses due to a lack of reliable imagery of the seafloor for those areas. No bathymetry was generated for the southern coastline of Timor-leste because no depth data were available to calibrate the imagery and to subsequently validate the depths. Pre-processing of all WorldView-2 satellite images was performed using the same methods, to produce a rectified, deglinted image, with radiance and depth invariant data layers. Based on the error analyses, derived bathymetry was clipped where statistical results were poor. Yes Unknown Yes No Unknown NCEI-CO Unknown NOAA IRC and NOAA Fisheries ITS resources and assets. Bathymetry data were derived for nearshore waters along the northern coastline of Timor-Leste, and the coastlines of Oecusse district and Atauro Island, from WorldView-2 satellite imagery following methods developed by Ehses and Rooney (2015). Ehses , J.S., and J.J. Rooney. 2015. Depth derivation using multispectral WorldView-2 satellite imagery. U.S. Dep. Commer., NOAA Tech. Memo., NOAA-TM-NMFS-PIFSC-46, 24 p. Organization Pacific Islands Fisheries Science Center, PIFSC 2015-06-17 https://www.pifsc.noaa.gov/library/pubs/tech/NOAA_Tech_Memo_PIFSC_46.pdf PIFSC. 2017. Interdisciplinary baseline ecosystem assessment surveys to inform ecosystem-based management planning in Timor-Leste: Final Report. NOAA Pacific Islands Fisheries Science Center, PIFSC Special Publication, SP-17-02, 234p. Organization Pacific Islands Fisheries Science Center, PIFSC 2017-06-21 https://doi.org/10.7289/V5/SP-PIFSC-17-002 The methods to derive depths from WorldView-2 satellite imagery for Timor-leste are described in Appendix C, and findings/results are summarized in Chapter 2. The data is presented in a 50+ page map book in Appendix D. 1 Satellite imagery was collected by the WorldView-2 commercial Earth observation satellite owned by DigitalGlobe. WorldView-2 provides panchromatic imagery of .46-meter resolution, and eight-band multispectral imagery with 1.84 meter (6 foot 0 inch) resolution. 2 Image pre-processing steps are described in the NOAA Technical Memorandum "Depth Derivation Using Multispectral WorldView-2 Satellite Imagery". Pre-processing of all WorldView-2 satellite images was performed using the same methods, to produce a deglinted image, radiance and depth invariant data layers. Organization Pacific Islands Fisheries Science Center PIFSC pifsc.info@noaa.gov https://ror.org/02apffz65 1845 Wasp Blvd. Honolulu HI 96818 USA 808-725-5360 https://www.pifsc.noaa.gov Pacific Island Fisheries Science Center homepage Online Resource 8:00 a.m. - 4:30 p.m. Ehses , J.S., and J.J. Rooney. 2015. Depth derivation using multispectral WorldView-2 satellite imagery. U.S. Dep. Commer., NOAA Tech. Memo., NOAA-TM-NMFS-PIFSC-46, 24 p. 3 The available ground-truth data (in-situ single beam depth data) was separated into two subsets; one subset was used to develop the multivariate slope intercept equation, and the second subset was used for the error analyses. The deglinted values of coastal, blue, green, and yellow bands were extracted in ArcGIS using the ground truth data set aside for the equation. 4 Multiple linear regression analysis of the extracted deglinted values and ground-truth data were performed in Excel and the multivariate slope intercept equation from the analysis was applied to the deglinted image in ENVI. 5 An error analysis was performed comparing the calculated depths with the second subset of the ground truth data. Depending on the results of the error analysis (the level of agreement between the derived data and the ground truth data), different formulas were tested using different combinations of the color bands to improve the results (i.e., different color bands from the satellite imagery were inserted into differing formulas to calculate the derived bathymetric data). 6 The derived bathymetry values that are out of range based on the error analysis were clipped out in ArcGIS. 7 A readme text file (README_FILE.txt) was prepared for each image used that catalogs the specific details for each set of derived depths, including the source image, processor names, dates, ground-truth data details, formulas, slope values, coefficients, and process steps. 8 The complete methodology followed to derive depths is described in the final report for Timor-Leste prepared by the NOAA Coral Reef Ecosystem Program. Organization Pacific Islands Fisheries Science Center PIFSC pifsc.info@noaa.gov https://ror.org/02apffz65 1845 Wasp Blvd. Honolulu HI 96818 USA 808-725-5360 https://www.pifsc.noaa.gov Pacific Island Fisheries Science Center homepage Online Resource 8:00 a.m. - 4:30 p.m. PIFSC. 2017. Interdisciplinary baseline ecosystem assessment surveys to inform ecosystem-based management planning in Timor-Leste: Final Report. NOAA Pacific Islands Fisheries Science Center, PIFSC Special Publication, SP-17-02, 234p. 50702 Entity 46159 Data Set Cross Reference 46160 Data Set Cross Reference 46161 Data Set Cross Reference 46162 Data Set Cross Reference 32998 Data Set Cross Reference 25307 Data Set Cross Reference 29128 Data Set Cross Reference 46163 Data Set Cross Reference 46164 Data Set Cross Reference 46151 Data Set Cross Reference gov.noaa.nmfs.inport:46150 Annette DesRochers 2017-06-01T11:56:27 SysAdmin InPortAdmin 2026-03-04T19:17:17 2018-01-03 Pacific Islands Fisheries Science Center PIFSC 1845 Wasp Blvd. Honolulu HI 96818 USA 808-725-5300 https://www.pifsc.noaa.gov 8:00 a.m. - 4:30 p.m. 1001 Public No No 2018-01-03 1 Year 2019-01-03