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Short Citation:
National Centers for Coastal Ocean Science, 2023: Gulf of Maine - Control Points Used to Validate the Accuracies of the Interpolated Water Density Rasters,

Item Identification

Title: Gulf of Maine - Control Points Used to Validate the Accuracies of the Interpolated Water Density Rasters
Short Name: water_density_validation_pts
Status: Completed
Publication Date: 2006

This feature dataset contains the control points used to validate the accuracies of the interpolated water density rasters for the Gulf of Maine. These control points were selected randomly from the water density data points, using Hawth's Create Random Selection Tool. Twenty-five percent of each seasonal bin (for each year and at each depth) were randomly selected and set aside for validation. For example, if there were 1,000 water density data points for the fall (September, October, November) 2003 at 0 meters, then 250 of those points were randomly selected, removed and set aside to assess the accuracy of interpolated surface. The naming convention of the validation point feature class includes the year (or years), the season, and the depth (in meters) it was selected from. So for example, the name: ValidationPoints_1997_2004_Fall_0m would indicate that this point feature class was randomly selected from water density points that were at 0 meters in the fall between 1997-2004. The seasons were defined using the same months as the remote sensing data--namely, Fall = September, October, November; Winter = December, January, February; Spring = March, April, May; and Summer = June, July, August.


This data was created in order to support a biogeographic assessment of the Stellwagen Bank National Marine Sanctuary.



Supplemental Information:



Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
NOS Data Explorer Topic Category Environmental Monitoring
NOS Data Explorer Topic Category Tides/Currents
None halocline
None pycnocline
None thermocline
None water density
None water salinity
None water stratification
None water temperature

Temporal Keywords

Thesaurus Keyword
None 1912-2004

Spatial Keywords

Thesaurus Keyword
None Gulf of Maine
None Stellwagen Bank National Marine Sanctuary

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 Frequency: None Planned
Data Presentation Form: vector digital data
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.

Data Set Credit: National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Program: Bedford Institute of Oceanography:

Support Roles

Data Steward

CC ID: 476892
Date Effective From: 2006
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:


CC ID: 476894
Date Effective From: 2006
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Metadata Contact

CC ID: 476895
Date Effective From: 2006
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Point of Contact

CC ID: 476893
Date Effective From: 2006
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Principal Investigator

CC ID: 476896
Date Effective From: 2006
Date Effective To:
Contact (Person): Costa, Bryan
Email Address:


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 476899
W° Bound: -72.477168
E° Bound: -59.493899
N° Bound: 46.530855
S° Bound: 36.679089

Extent Group 1 / Time Frame 1

CC ID: 476898
Time Frame Type: Range
Start: 1912
End: 2004

Spatial Information

Spatial Representation

Representations Used

Vector: 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:

None. Acknowledgement of the National Oceanic and Atmospheric Administration, Center for Coastal Monitoring and Assessment, Biogeography Program and the Bedford Institute of Oceanography would be appreciated in products derived from these data.



CC ID: 476890
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 476915
Activity Date/Time: 2013-01-30

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 476914
Activity Date/Time: 2017-04-05

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

Activity Log 3

CC ID: 586054
Activity Date/Time: 2017-09-13

Partial upload of Spatial Info section only.

Technical Environment


Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog

Data Quality

Completeness Report:

The spatial distribution of water density measurements varied between seasonal and yearly bins.

Conceptual Consistency:

The accuracy of these interpolated water density rasters were validated. In order to do so, 25% of the water density measurements were set aside before the interpolation. After the interpolation, the corresponding validation points were intersected with the interpolated rasters to calculate a simple difference between the observed (validation points) and the predicted (interpolated surface) measurement. These validation points and values are located in the Water_Stratification_Points geodatabase, Validation_Points feature data set.


Process Steps

Process Step 1

CC ID: 476888

Water density rasters were interpolated for each season (winter, spring, summer fall) from water density (sigma t) point data using a Radial Basis Function (spline with tension) at 0 and 50 meters. The 0m water density raster for each season was then subtracted (using the raster calculator in ESRI's Spatial Analyst Extension) from the 50m water density raster for the same season.

Process Date/Time: 2005-12-01 00:00:00

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity Validation_Points

Catalog Details

Catalog Item ID: 39613
GUID: gov.noaa.nmfs.inport:39613
Metadata Record Created By: Tyler Christensen
Metadata Record Created: 2017-04-05 12:53+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-05-30 18:10+0000
Metadata Record Published: 2017-09-13
Owner Org: NCCOS
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2017-09-13
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2018-09-13