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Short Citation:
Office for Coastal Management, 2023: Chlorophyll-a,

Item Identification

Title: Chlorophyll-a
Status: Completed

This algorithm returns the near-surface concentration of chlorophyll-a (chlor_a) in mg m-3, calculated using an empirical relationship derived from in situ measurements of chlor_a and remote sensing reflectances (Rrs) in the blue-to-green region of the visible spectrum. The implementation is contingent on the availability three or more sensor bands spanning the 440 - 670 nm spectral regime. The algorithm is applicable to all current ocean color sensors. The chlor_a product is included as part of the standard Level-2 OC product suite and the Level-3 CHL product suite. The data represents monthly mean climatologies on a monthly data time scale for a ten-year period between 2007 and 2016. These climatologies were created using the 'Create Climatological Rasters for NASA OceanColor L3 SMI Product' in the Marine Geospatial Ecology Toolbox for ArcGIS Desktop 10.1-10.6. Available for download here:


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.


Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
ISO 19115 Topic Category
None coastal
None renewable energy planning

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
None Exclusive Economic Zone
None Outer Continental Shelf
None Territorial Sea
None United States of America

Physical Location

City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Data Presentation Form: Map (digital)
Distribution Liability:

Data Set Credit: Bureau of Ocean Energy Management, NOAA Office for Coastal Management, NASA Goddard Space Flight Center, Ocean Ecology Laboratory, Ocean Biology Processing Group, NOAA National Centers for Coastal Ocean Science

Support Roles

Point of Contact

CC ID: 1114717
Date Effective From: 2018-06
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


Currentness Reference: Publication Date

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1114725
W° Bound: -180
E° Bound: 180
N° Bound: 65
S° Bound: 10

Access Information

Security Class: Unclassified
Data Use Constraints:

For coastal and ocean planning

Distribution Information

Distribution 1

CC ID: 1121092
Download URL:
Description: Data Registry

Distribution 2

CC ID: 1114718
Download URL:

Technical Environment


Version 6.2 (Build 9200) ; Esri ArcGIS

Data Quality


The attributes in this dataset are believed to be accurate.

Horizontal Positional Accuracy:

Maximum scale of intended use is 1:80,000.

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.



Chlorophyll-a Concentration Climatologies

CC ID: 1114722
Contact Name: NASA Goddard Space Flight Center, Ocean Ecology Laboratory, Ocean Biology Processing Group
Extent Type: Discrete
Extent Start Date/Time: 2018-06-01
Citation URL:
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Monthly or Annual Climatologies for Chlorophyll-a Concentration

Process Steps

Process Step 1

CC ID: 1114723

(1) Monthly and annual climatologies for chlorophyll-a concentration were downloaded using the Marine Geospatial Ecology Toolbox. The tool used to download these data is 'Create Climatological Rasters for NASA OceanColor L3 SMI Product'. The climatologies are created using monthly resolution data at a 10-year temporal resolution from 2007 to 2016. (2) Data were projected from WGS 1984 GCS to WGS 1984 World Mercator (WKID: 3395).

Process Date/Time: 2018-06-01 00:00:00

Catalog Details

Catalog Item ID: 66109
GUID: gov.noaa.nmfs.inport:66109
Metadata Record Created By: Brianna Key
Metadata Record Created: 2021-12-21 21:42+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-05-30 18:10+0000
Metadata Record Published: 2021-12-22
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2021-12-22
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2022-12-22