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Short Citation:
National Centers for Coastal Ocean Science, 2023: Grand Monthly Mean Chlorophyll Geotifs of Stellwagen Bank National Marine Sanctuary,

Item Identification

Title: Grand Monthly Mean Chlorophyll Geotifs of Stellwagen Bank National Marine Sanctuary
Short Name: SBNMS_CHL_grandmon_mean
Status: Completed
Publication Date: 2005

Grand Average Monthly Chlorophyll - Each image represents one calendar month


To provide a chlorophyll product that can be used for multiple applications and viewable using multiple software packages.




Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
NOS Data Explorer Topic Category Environmental Monitoring
None Chlorophyll
None Ocean Color
None SeaWiFS

Spatial Keywords

Thesaurus Keyword
None Gulf of Maine
None Stellwagen

Physical Location

Organization: National Centers for Coastal Ocean Science
City: Silver Spring
State/Province: MD

Data Set Information

Data Set Scope Code: Data Set
Maintenance Note:

could be updated monthly, depending on project needs

Data Presentation Form: geotif
Distribution Liability:

These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data have been used by NOAA, no warranty, expressed or implied, is made by NOAA as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by NOAA in the use of these data or related materials.NOAA makes no warranty regarding these data, expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA can not assume liability for and 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.

Support Roles

Data Steward

CC ID: 456905
Date Effective From: 2005
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:


CC ID: 456907
Date Effective From: 2005
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Metadata Contact

CC ID: 456908
Date Effective From: 2005
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Point of Contact

CC ID: 456906
Date Effective From: 2005
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Principal Investigator

CC ID: 456909
Date Effective From: 2005
Date Effective To:
Contact (Person): Costa, Bryan
Email Address:


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 456912
W° Bound: -72.195988
E° Bound: -65.013835
N° Bound: 45.46229
S° Bound: 39.482066

Extent Group 1 / Time Frame 1

CC ID: 456911
Time Frame Type: Range
Start: 1997-09
End: 2005-06

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Access Information

Security Class: Unclassified
Data Access Procedure:

Please contact the Stellwagen Banks NMS Research Coordinator for additional information on data access (;

Data Access Constraints:


Data Use Constraints:




CC ID: 456904
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 456921
Activity Date/Time: 2013-01-24

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 456920
Activity Date/Time: 2017-04-05

Converted from FGDC Content Standard for Digital Geospatial Metadata (version FGDC-STD-001-1998) using '' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 577345
Activity Date/Time: 2017-08-14

Partial upload of Maintenance Note field only.

Activity Log 4

CC ID: 585500
Activity Date/Time: 2017-09-13

Partial upload of Spatial Info section only.

Activity Log 5

CC ID: 600668
Activity Date/Time: 2017-11-01

Replaced entire Lineage section to populate new Source Contribution field.

Data Quality

Completeness Report:


Conceptual Consistency:




Monthly chlorophyll geotifs created from daily SeaWiFS imagery

CC ID: 600669
Contact Name: NOAA, NOS, CCMA
Publish Date: 2005-01-01
Extent Type: Range
Extent Start Date/Time: 1997-09
Extent End Date/Time: 2005-06
Source Contribution:

Monthly chlorophyll geotifs previously created (by Varis Ransi) were used to make grand monthly means, which consist of all of the months for the time series averaged together to make one mean image(ex: Jan '98, Jan '99, Jan 00, Jan 01, Jan 02, Jan 03, Jan 04 = SW1998200401_AVGCHL_UTM.tif). | Source Geospatial Form: unregistered | Type of Source Media: geotifs

Process Steps

Process Step 1

CC ID: 600670

An EASI program was run on the previously created grand monthly chlorophyll geotifs of the SeaWiFS northeast region to create geotifs for the specified region of the Gulf of Maine. The new geotifs were also reprojected from their original SIN E019 projection to Albers Conical Equal Area, GCS NAD 83. These images are scaled down from 16 bit data to 8 bit data. In order to get the chlorophyll values from the 8 bit geotifs the following formula should be applied to the 8 bit data values: CHL = 10^(((8bit # -1)*(3/250))-1.3)

Process Date/Time: 2005-01-01 00:00:00

Catalog Details

Catalog Item ID: 39088
GUID: gov.noaa.nmfs.inport:39088
Metadata Record Created By: Tyler Christensen
Metadata Record Created: 2017-04-05 12:50+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-05-30 18:09+0000
Metadata Record Published: 2017-11-09
Owner Org: NCCOS
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2017-11-09
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2018-11-09