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Short Citation:
National Centers for Coastal Ocean Science, 2024: U.S.V.I. Watershed Outflow Points,

Item Identification

Title: U.S.V.I. Watershed Outflow Points
Short Name: usvi_outflow_metadata
Status: Completed
Publication Date: 2005-10

U.S.V.I. watershed outflow points; areas of maximum flow accumulation within hydrological basins.


The purpose of this dataset is to provide the locations of sediment and pollution discharge from land into the marine environment. These are locations where the river mouth meets the sea, and thus, pollutants and sediment from land are accumulated.



Other Citation Details:

NOAA Summit-to-Sea Project


Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
None Environmental Monitoring

Spatial Keywords

Thesaurus Keyword

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 in this report, 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 of authors 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.

Data Set Credit: NOAA Summit-to-Sea Project, World Resources Institute (WRI)

Support Roles

Data Steward

CC ID: 476536
Date Effective From: 2005-10
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:


CC ID: 476538
Date Effective From: 2005-10
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Metadata Contact

CC ID: 476539
Date Effective From: 2005-10
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Point of Contact

CC ID: 476537
Date Effective From: 2005-10
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Principal Investigator

CC ID: 476540
Date Effective From: 2005-10
Date Effective To:
Contact (Person): Battista, Tim
Email Address:


Currentness Reference: Publication Date

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 476543
W° Bound: -65.080435
E° Bound: -64.569138
N° Bound: 18.403853
S° Bound: 17.67665

Extent Group 1 / Time Frame 1

CC ID: 476542
Time Frame Type: Discrete
Start: 2005-10

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Vector Representation 1

CC ID: 586019
Point Object Present?: Yes
Point Object Count: 420

Access Information

Security Class: Unclassified
Data Access Constraints:


Data Use Constraints:

Please credit the NOAA Summit-to-Sea project whenever possible. The distribution of this data product by NOAA does not constitute any real or implied responsibility for its accuracy or usefulness.

Distribution Information

Distribution 1

CC ID: 476544
Download URL:

Downloadable Data

File Type (Deprecated): shp
Distribution Format: Shapefile



CC ID: 476533
URL Type:
Online Resource


CC ID: 476534
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 476556
Activity Date/Time: 2013-07-03

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 476555
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: 586017
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:


Conceptual Consistency:



Process Steps

Process Step 1

CC ID: 476531

Hydrologic modeling allows one to develop a series of data sets from a single elevation data set (derived data sets include slope, flow direction, flow accumulation, basins, and outflow points 1. Hydrologic modeling was based on the hydrologically corrected 30m resolution National Elevation Dataset (NED) from US Geological Survey (USGS.) 2. FLOWDIRECTION was estimated from the DEM. This results in a data set showing which of eight directions every given 30m cell flows. (coded as integer 1,2,4,8,16,32,64, and 128, with 1 being due East.) 3. FLOWACCUMULATION was run on the FlowDIR grid. This results in an integer grid reflecting the number of cells flowing into any given cell. The Flowdirection grid can be used to identify rivers (gut) locations. Any cells above a given value (such as 200) represent a potential gut location. 4. The BASIN command was run on the FlowDirection grid. This produced a dataset of all grid cells discharging to a single outflow point. This includes many tiny basins. To eliminate these tiny basins, a minimum basin size (cell count) threshold was imposed. There is a unique identified (BASIN_ID) within each file to identify the basin. 5.The outflow points were determined by locating the point of maximum flow within each basin. These are identified by using the map calculator function in ArcMap, to identify the cell count for the basin that matches the maximum FlowAccumulation grid value in each basin minus 1. These locations (raster) were converted to vector point file. The resulting set of basins and pour points is valuable for summarizing the spatial threat indicators developed in subsequent steps of this analysis.

(USGS National Elevation Dataset

Process Date/Time: 2005-10-01 00:00:00

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity usvi_outflow

Catalog Details

Catalog Item ID: 39601
GUID: gov.noaa.nmfs.inport:39601
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: 2023-10-17 16:12+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