Derived bathymetry from IKONOS satellite imagery of nearshore benthic habitats
Pacific Islands Fisheries Science Center
Data Set
(DS)
| ID: 25280
| Published / External
Created: 2015-06-08
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Last Modified: 2023-10-17
Project (PRJ) | ID: 12595
ID: 25280
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | Derived bathymetry from IKONOS satellite imagery of nearshore benthic habitats |
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Short Name | IKONOS DERIVED BATHY |
* Status | Completed |
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• Publication Date | 2016 |
* » Abstract |
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. |
* Purpose |
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. |
Notes |
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) |
Other Citation Details | |
• Supplemental Information |
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. |
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Keywords
Theme Keywords
Thesaurus | Keyword |
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ISO 19115 Topic Category | elevation |
CoRIS Discovery Thesaurus | Geographic Information > Bathymetry |
CoRIS Theme Thesaurus | earth science > oceans > bathymetry/seafloor topography > bathymetry |
CoRIS Theme Thesaurus | EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs |
CRCP Project | 467 |
CRCP Project | Benthic Habitat Mapping and Characterization in the Pacific Islands Region |
CRCP Project | Mapping and EcoSpatial Information Products to Support Coral Reef Ecosystem Management in the Pacific Islands Region |
NODC OBSERVATION TYPES THESAURUS | surface measurements |
NODC PROJECT NAMES THESAURUS | Coral Reef Conservation Program |
NODC SUBMITTING INSTITUTION NAMES THESAURUS | US DOC; NOAA; NMFS; Pacific Islands Fisheries Science Center; Ecosystem Sciences Division; Coral Reef Ecosystem Program |
None | Coral Reef Ecosystem Division |
None | Coral Reef Ecosystem Program |
None | CRED |
None | CREP |
None | Pacific Islands Fisheries Science Center |
None | PIFSC |
Temporal Keywords
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* Spatial Keywords
Thesaurus | Keyword |
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NODC SEA AREA NAMES THESAURUS | Equatorial Pacific Ocean |
NODC SEA AREA NAMES THESAURUS | North Pacific Ocean |
NODC SEA AREA NAMES THESAURUS | Pacific Remote Islands Marine National Monument |
NODC SEA AREA NAMES THESAURUS | South Pacific Ocean |
None | Pacific Remote Island Areas |
None | PRIA |
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Global Change Master Directory | SEA FLOOR |
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Physical Location
• » Organization | Pacific Islands Fisheries Science Center |
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• » City | Honolulu |
• » State/Province | HI |
• Country | USA |
• » Location Description |
Data Set Information
* Data Set Scope Code | Data Set |
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• Data Set Type | GIS dataset of raster files |
• Maintenance Frequency | None Planned |
Maintenance Note | |
» Data Presentation Form | Map (digital) |
• Entity Attribute Overview |
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. |
Entity Attribute Detail Citation |
none |
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Distribution Liability |
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. |
Data Set Credit | PIBHMC, CRED, PIFSC, NOAA, JIMAR and HMRG |
Support Roles
* » Support Role | Data Steward |
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* » Date Effective From | 2012 |
Date Effective To | |
Person | Ehses, Julia |
Address |
1845 Wasp Blvd. Honolulu, HI 96818 USA |
Email Address | julia.ehses@noaa.gov |
Phone | (808)725-5447 |
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Contact Instructions |
Email preferred |
* » Support Role | Distributor |
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* » Date Effective From | 2012 |
Date Effective To | |
Person | Ehses, Julia |
Address |
1845 Wasp Blvd. Honolulu, HI 96818 USA |
Email Address | julia.ehses@noaa.gov |
Phone | (808)725-5447 |
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Contact Instructions |
Email preferred |
* » Support Role | Metadata Contact |
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* » Date Effective From | 2012 |
Date Effective To | |
Person | Akridge, Michael W |
Address |
1845 Wasp Blvd. Honolulu, HI 96818 USA |
Email Address | michael.akridge@noaa.gov |
Phone | (808)725-5483 |
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Email preferred |
* » Support Role | Originator |
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* » Date Effective From | 2012 |
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Organization | Pacific Islands Fisheries Science Center (PIFSC) |
Address |
1845 Wasp Blvd. Honolulu, HI 96818 USA |
Email Address | pifsc.info@noaa.gov |
Phone | 808-725-5360 |
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URL | https://www.pifsc.noaa.gov |
Business Hours | 8:00 a.m. - 4:30 p.m. |
Contact Instructions |
* » Support Role | Point of Contact |
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* » Date Effective From | 2012 |
Date Effective To | |
Person | Rooney, John JB |
Address |
1845 Wasp Blvd. Honolulu, HI 96818 USA |
Email Address | john.rooney@noaa.gov |
Phone | (808)725-5438 |
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Currentness Reference | Ground Condition |
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* » W° Bound | -156.776 |
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* » E° Bound | -156.647 |
* » N° Bound | 20.9839 |
* » S° Bound | 20.8357 |
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* » Start | 2010-04-06 |
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* » Security Class | Unclassified |
* Security Classification System |
Not applicable |
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• Data Access Policy |
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 Access Procedure |
Data can be accessed online via the NOAA National Centers for Environmental Information (NCEI) Ocean Archive, accession #. ADD ACCESSION ONCE ASSIGNED |
• » Data Access Constraints |
none |
• Data Use Constraints |
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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» Download URL | ftp://ftp.soest.hawaii.edu/pibhmc/website/data/mhi/bathymetry/DD2_Depth2_filtermin4x4_10m.zip |
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URL | http://www.soest.hawaii.edu/pibhmc/pibhmc_mhi_mai_bathy.htm |
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URL Type | Online Resource |
File Resource Format | HTM |
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URL | http://www.soest.hawaii.edu/pibhmc/MHI_images/KaanapaliDerivedBathy_445.jpg |
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netCDF file created using the Generic Mapping Tools (GMT) and ArcGIS ASCII file, both created in a LINUX environment |
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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. |
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Data Management
» Have Resources for Management of these Data Been Identified? | Yes |
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» Approximate Percentage of Budget for these Data Devoted to Data Management | Unknown |
» Do these Data Comply with the Data Access Directive? | Yes |
» Is Access to the Data Limited Based on an Approved Waiver? | No |
» If Distributor (Data Hosting Service) is Needed, Please Indicate | |
» Approximate Delay Between Data Collection and Dissemination | Unknown |
» If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed | |
» Actual or Planned Long-Term Data Archive Location | NCEI-MD |
» Approximate Delay Between Data Collection and Archiving | Unknown |
» How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive? |
NOAA IRC and NOAA Fisheries ITS resources and assets. |
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Process Step Number | 1 |
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» Description |
Multiple tools in ENVI 4.8 were used to complete the following processing steps: Data conversion from digital number to radiance, correction for atmosphere and water surface reflection, linearization of spectral decay as function of depth, masking of non-applicable values, and bathymetric derivation using variables from multiple linear regression analysis. Multiple tools in ArcGIS 10.0 were used for dataset integration and to extract values for the multiple linear regression analysis and subsequent error analyses. The statisitcs program Matlab 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 D = a + (bi)(xi) + (bj)(xj) Where: D = depth a = intercept b = slope x = the linearized spectral value resulted in 7.8491 - 2.8696(b1) + 7.9593(b2) b1 is the output masked linearized pictral value of each pixel of Coastal band b2 is the output masked linearized pictral value of each pixel of Blue band More information on this integration process is provided in the product error analysis, availble from PIBHMC upon request. This mosaiced derived bathymetry product (JohDBall3) was then integrated with the multibeam sonar data, with sonar data prioritized over derived data, to create the final product (JohDB3MB). A detailed description of all processing steps is available at: ftp://ftp.soest.hawaii.edu/pibhmc/website/webdocs/documentation/Cookbook_042108.pdf An error analysis of each derived bathymetry grid used is available from PIBHMC upon request. To produce the interpolated surface shown in the map, the floating point grid was converted to a point shapefile in Arc GIS 9.3 using the 'float to raster' and 'raster to point' tools in the Arc Toolbox. A buffer of 600m from the shoreline was created and the derived bathymetry points were clipped to exclude data outside this buffer. This distance was chosen to exclude areas of deeper water that were erroneously returning shallow depth values, due to characteristics of the water column. An Inverse Distance Weighted interpolation was run using 3D Analyst, to produce an interpolated surface, with a grid cell size of 10 m, a variable search radius with a maximum distance of 60 m, and using the coastline as a barrier. All other settings used were default. The interpolated surface was clipped using the coastline and a small number of isolated cells were manually deleted. |
Process Date/Time | 2011-10-12 00:00:00 |
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Catalog Details
Catalog Item ID | 25280 |
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Metadata Record Created By | Annette M DesRochers |
Metadata Record Created | 2015-06-08 17:49+0000 |
Metadata Record Last Modified By | SysAdmin InPortAdmin |
» Metadata Record Last Modified | 2023-10-17 16:12+0000 |
Metadata Record Published | 2019-05-30 |
Owner Org | PIFSC |
Metadata Publication Status | Published Externally |
Do Not Publish? | N |
Metadata Workflow State | Published / External |
Metadata Last Review Date | 2019-05-30 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2020-05-30 |
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