Light Attenuation Kd490
Office for Coastal Management
Data Set
(DS)
| ID: 66147
| Published / External
Created: 2021-12-22
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Last Modified: 2024-08-15
Project (PRJ) | ID: 37232
ID: 66147
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
| * » Title | Light Attenuation Kd490 |
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| Short Name | |
| * Status | Completed |
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| • Publication Date | |
| * » Abstract |
This dataset represents monthly and annual mean summaries for Kd490 for the time period from 2000/2001 to 2017/2018, depending on the month and data available (see processing steps). Kd (490) is the diffuse attenuation coefficient at 490 nm. The diffuse attenuation coefficient in water indicates how strongly light intensity at a specified wavelength is attenuated within the water column. This parameter has wide applicability in ocean optics, as it is directly related to the presence of scattering particles in the water column, either organic or inorganic, and thus is an indication of water clarity. The diffuse attenuation coefficient at 490 nm (Kd490) indicates the turbidity of the water column -- how visible light in the blue to green region of the spectrum penetrates within the water column. The value of Kd490 (m-1) represents the rate at which light at 490 nm is attenuated with depth. For example, a Kd490 of 0.1/meter means that light intensity will be reduced one natural log within 10 meters of water. Thus, for a Kd490 of 0.1, one attenuation length is 10 meters. Higher Kd490 value means smaller attenuation depth and lower clarity of ocean water. |
| * Purpose |
To support ocean planning activities pursuant to the Executive Order Regarding the Ocean Policy to Advance the Economic, Security, and Environmental Interests of the United States, the Energy Policy Act, the National Environmental Policy Act, the Rivers and Harbors Act, and the Coastal Zone Management Act. |
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Keywords
Theme Keywords
| Thesaurus | Keyword |
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| ISO 19115 Topic Category | oceans |
| ISO 19115 Topic Category | planningCadastre |
| None | coastal |
| None | planning |
| None | renewable energy |
| None | water column |
| None | water quality |
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* Spatial Keywords
| Thesaurus | Keyword |
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| Global Change Master Directory (GCMD) Location Keywords | CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA |
| None | United States |
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Physical Location
| • » Organization | |
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| • » City | Charleston |
| • » State/Province | SC |
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| • » Location Description |
Data Set Information
| * Data Set Scope Code | Data Set |
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| • Data Set Type | |
| • Maintenance Frequency | As Needed |
| Maintenance Note | |
| » Data Presentation Form | Map (digital) |
| • Entity Attribute Overview | |
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| Distribution Liability |
https://www.marinecadastre.gov/about/disclaimer.html |
| Data Set Credit | ORIGINATORS: NASA Goddard Space Flight Center, Ocean Ecology Laboratory, Ocean Biology Processing Group; Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA) National Ocean Service (NOS), Office for Coastal Management (OCM); Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA) National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS); |
Support Roles
| * » Support Role | Point of Contact |
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| * » Date Effective From | 2018-06 |
| Date Effective To | |
| Organization | NOAA Office for Coastal Management (NOAA/OCM) |
| Address |
2234 South Hobson Ave Charleston, SC 29405-2413 |
| Email Address | coastal.info@noaa.gov |
| Phone | (843) 740-1202 |
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| Mobile | |
| URL | https://coast.noaa.gov |
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Extents
| Currentness Reference | Publication Date |
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Extent Group 1
| Extent Description |
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Extent Group 1 / Geographic Area 1
| * » W° Bound | -179.999989 |
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| * » E° Bound | 179.999996 |
| * » N° Bound | 74.710722 |
| * » S° Bound | -17.584128 |
| * » Description |
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Spatial Information
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Access Information
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| * » Security Class | Unclassified |
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| • Data Access Policy | |
| » Data Access Procedure | |
| • » Data Access Constraints | |
| • Data Use Constraints |
For coastal and ocean planning |
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Distribution Information
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| » Download URL | https://marinecadastre.gov/data/ |
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Marine Cadastre Data Registry |
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| » Download URL | https://marinecadastre.gov/downloads/data/mc/LightAttenuationKd490.zip |
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Technical Environment
| Description |
Version 6.2 (Build 9200) ; Esri ArcGIS 10.5.1.7333 |
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Data Quality
| Representativeness | |
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| Accuracy |
The attributes in this dataset are believed to be accurate. |
| Analytical Accuracy | |
| Horizontal Positional Accuracy |
Maximum scale of intended use is 1:80,000. |
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| Completeness Report |
Spatial and attribute properties are believed to be complete, although attribute information has been simplified. Geometric thresholds from original data are preserved. No tests have been completed for exhaustiveness. |
| Conceptual Consistency |
These data are believed to be logically consistent. Geometry is topologically clean. |
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Data Management
| » Have Resources for Management of these Data Been Identified? | |
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| » Do these Data Comply with the Data Access Directive? | |
| » Is Access to the Data Limited Based on an Approved Waiver? | |
| » If Distributor (Data Hosting Service) is Needed, Please Indicate | |
| » Approximate Delay Between Data Collection and Dissemination | |
| » If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed |
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| » Actual or Planned Long-Term Data Archive Location | |
| » If World Data Center or Other, Specify | |
| » If To Be Determined, Unable to Archive, or No Archiving Intended, Explain |
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| » How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive? |
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Lineage
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Sources
| Citation Title | Monthly and Annual Summaries for Kd (490) |
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| Contact Name | NASA Goddard Space Flight Center, Ocean Ecology Laboratory, Ocean Biology Processing Group |
| Publish Date | |
| Extent Type | Discrete |
| Extent Start Date/Time | 2018-08-01 |
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| Citation URL | https://oceancolor.gsfc.nasa.gov/atbd/kd_490/ |
| Citation URL Name | Source Online Linkage |
| Citation URL Description |
URL where the source data were originally accessed. |
| Source Contribution |
Monthly and Annual Summaries for Kd (490) |
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Process Steps
| Process Step Number | 1 |
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| » Description |
(1) Downloaded the Level-3 Standard Mapped Image (SMI) for Kd490 data from MODIS for each monthly climatology (summary) and the entire mission composite at 4km resolution.* Additionally all Level-3 SMIs that were used to create the monthly climatology and entire mission composite were downloaded for descriptive statistic calculations. (2) R was used to create Geotiffs of each dataset (GCS WGS 1984). (3) Geotiffs converted to point features – X and Y coordinate field calculated - for the point dataset conversion (not relevant to raster dataset). (4) Point features were clipped by U.S. Economic Exclusion Zone and State waters. (5) All point features were combined into a single feature class. (6) Single point feature class and raster projected into WGS 1984 World Mercator. Temporal resolution for each monthly and annual mean: Kd 490 (m-1) January monthly mean 2001-2018 Kd 490 (m-1) February monthly mean 2000-2018 Kd 490 (m-1) March monthly mean 2000-2018 Kd 490 (m-1) April monthly mean 2000-2018 Kd 490 (m-1) May monthly mean 2000-2018 Kd 490 (m-1) June monthly mean 2000-2017 Kd 490 (m-1) July monthly mean 2000-2017 Kd 490 (m-1) August monthly mean 2000-2017 Kd 490 (m-1) September monthly mean 2000-2017 Kd 490 (m-1) October monthly mean 2000-2017 Kd 490 (m-1) November monthly mean 2000-2017 Kd 490 (m-1) December monthly mean 2000-2017 Kd 490 (m-1) Cumulative mean of entire mission (Annual means 2000-2017 with monthly means from Jan. to May 2018) |
| Process Date/Time | 2018-08-01 00:00:00 |
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Acquisition Information
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Child Items
Rubric scores updated every 15m
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Catalog Details
| Catalog Item ID | 66147 |
|---|---|
| Metadata Record Created By | Brianna Key |
| Metadata Record Created | 2021-12-22 03:53+0000 |
| Metadata Record Last Modified By | Daniel Martin |
| » Metadata Record Last Modified | 2024-08-15 14:01+0000 |
| Metadata Record Published | 2021-12-22 |
| Owner Org | OCM |
| Metadata Publication Status | Published Externally |
| Do Not Publish? | N |
| Metadata Workflow State | Published / External |
| Metadata Last Review Date | 2021-12-22 |
| Metadata Review Frequency | 1 Year |
| Metadata Next Review Date | 2022-12-22 |
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