USVI Land-Based Threat to Benthic Habitats
Data Set (DS) | National Centers for Coastal Ocean Science (NCCOS)GUID: gov.noaa.nmfs.inport:39594 | Updated: October 17, 2023 | Published / External
Item Identification
Title: | USVI Land-Based Threat to Benthic Habitats |
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Short Name: | usvi_benthic_threat_metadata |
Status: | Completed |
Publication Date: | 2006-01 |
Abstract: |
This data set describes the potential threat of sediment delivery and land-based sources of pollution to benthic habitats. This dataset is derived from NOAA's study, the Benthic Habitats of Puerto Rico and the U.S. Virgin Islands. The Benthic Habitats data is the result of a cooperative effort between NOAA's National Centers for Coastal Ocean Science (NCCOS), U.S. Geological Survey, National Park Service, and the National Geophysical Data Center, to produce benthic habitat maps and georeferenced imagery for Puerto Rico. This project was conducted in support of the U.S. Coral Reef Task Force. |
Purpose: |
The purpose of this data set is to characterize land-based threats on coral reef ecosystems. This project was conducted in support of the U.S. Coral Reef Task Force. For more information see http://www.coralreef.gov |
Notes: |
827 |
Other Citation Details: |
NOAA Summit-to-Sea Project |
Keywords
Theme Keywords
Thesaurus | Keyword |
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ISO 19115 Topic Category |
environment
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UNCONTROLLED | |
None. | CORAL REEFS |
None. | Environmental Monitoring |
None. | EROSION |
None. | LAND BASED SOURCES OF POLLUTION |
None. | POLLUTION |
None. | RUN OFF |
None. | SEDIMENT |
None. | SEDIMENT DELIVERY |
None. | WATERSHED |
Spatial Keywords
Thesaurus | Keyword |
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UNCONTROLLED | |
None | SAINT CROIX |
None | SAINT JOHN |
None | SAINT THOMAS |
None | US VIRGIN ISLANDS |
None | USVI |
Physical Location
Organization: | National Centers for Coastal Ocean Science |
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City: | Silver Spring |
State/Province: | MD |
Data Set Information
Data Set Scope Code: | Data Set |
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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: | Puerto Rico Department of Natural and Environmental Resources, University of Puerto Rico, USGS, NPS, VI. Dept. Planning Natural Resources; Div. Fish and Wildlife, Univ. VI, Cons. Data Center, The Nature Conservancy, Sea Grant, and other local and regional experts for input and review. |
Support Roles
Data Steward
Date Effective From: | 2006-01 |
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Date Effective To: | |
Contact (Position): | NCCOS Scientific Data Coordinator |
Email Address: | NCCOS.data@noaa.gov |
Distributor
Date Effective From: | 2006-01 |
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Date Effective To: | |
Contact (Position): | NCCOS Scientific Data Coordinator |
Email Address: | NCCOS.data@noaa.gov |
Metadata Contact
Date Effective From: | 2006-01 |
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Date Effective To: | |
Contact (Position): | NCCOS Scientific Data Coordinator |
Email Address: | NCCOS.data@noaa.gov |
Point of Contact
Date Effective From: | 2006-01 |
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Date Effective To: | |
Contact (Position): | NCCOS Scientific Data Coordinator |
Email Address: | NCCOS.data@noaa.gov |
Principal Investigator
Date Effective From: | 2006-01 |
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Date Effective To: | |
Contact (Person): | Battista, Tim |
Email Address: | tim.battista@noaa.gov |
Extents
Currentness Reference: | Ground Condition |
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Extent Group 1
Extent Group 1 / Geographic Area 1
W° Bound: | -65.088802 | |
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E° Bound: | -64.43628 | |
N° Bound: | 18.417743 | |
S° Bound: | 17.633663 |
Extent Group 1 / Time Frame 1
Time Frame Type: | Discrete |
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Start: | 2000 |
Spatial Information
Spatial Representation
Representations Used
Vector: | Yes |
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Vector Representation 1
Complex Object Present?: | Yes |
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Complex Object Count: | 2395 |
Access Information
Security Class: | Unclassified |
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Data Access Constraints: |
None |
Data Use Constraints: |
please acknowledge the NOAA Summit-to-Sea project when using or publishing this data. The distribution of this data product by NOAA does not constitute any real or implied responsibility for its accuracy or usefulness. Map products should not be used for navigation. |
Distribution Information
Distribution 1
Download URL: | http://ccma.nos.noaa.gov/ecosystems/coralreef/summit_sea/summit2seaUSVI.zip |
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Distributor: | |
Description: |
Downloadable Data |
File Type (Deprecated): | shp |
Distribution Format: | Shapefile |
URLs
URL 1
URL: | http://ccma.nos.noaa.gov/ecosystems/coralreef/summit_sea/summit2seaUSVI.zip |
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URL Type: |
Online Resource
|
URL 2
URL: | http://ccma.nos.noaa.gov/ecosystems/coralreef/summit_sea/ |
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URL Type: |
Online Resource
|
Activity Log
Activity Log 1
Activity Date/Time: | 2013-07-02 |
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Description: |
Date that the source FGDC record was last modified. |
Activity Log 2
Activity Date/Time: | 2017-04-05 |
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Description: |
Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details. |
Activity Log 3
Activity Date/Time: | 2017-09-13 |
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Description: |
Partial upload of Spatial Info section only. |
Technical Environment
Description: |
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722 |
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Data Quality
Completeness Report: |
N/A |
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Conceptual Consistency: |
N/A |
Lineage
Process Steps
Process Step 1
Description: |
Ground control points, camera calibration data, and USGS DTM data were used to orthorectify 500 dpi scans of the aerial photos using Socet Set Version 4.2.1. Orthorectified images were then loaded into ArcView 3.2 with the Image Analyst and Habitat Digitizer Extensions activated. This allowed the photointerpreter to interpret features, delineate and attribute benthic habitat directly into a digital reference system. The data were saved as ArcView shapefiles.to estimate the potential threat to each polygon, the following methodology was employed:Step 1) The first step of the analysis involves estimating likely relative erosion rates for each 30 m resolution grid cell using a modified, simplified form of the Revised Universal Soil Loss Equation (RUSLE) (USDA, 1989). Information on slope, land cover type, precipitation, and soil porosity were integrated to develop an indicator of relative erosion potential (REP) for all land areas within Puerto Rico. Inputs: (REP relies upon four input data sets, three of which were described under the analysis of vulnerability to erosion, above.) 4. Slope (percentage) - for each 30m grid cell, derived from the (raw) DEM (without hydrologic correction.)5. Relative erosion rate by land cover type. Relative erosion rates for each land cover type were calculated using a look-up table. Land cover categories from NASA Geocover-LC products covering Puerto Rico (http://www.MDafederal.com/geocover/geocoverlc/) were reclassified to relative erosion rates, ranging from 15 (for forest) to 220 for barren land. (below) These relative erosion rates are based on published work involving conversion factors. 6.Precipitation during the peak rainfall month (in millimeters) - Long-term average monthly precipitation values for the peak rainfall month of the year is an interpolated grid based on data for climate stations from NOAA's National Climate Data Center (NCDC). This variable was chosen because it is more indicative of the rainy season and more extreme events during the year.7.Soil erodibility factor (K-ffactor) - the K-ffactor was obtained from the SSURGO database of the USDA.Land Cover Type, Grid Code, Relative Erosion RateDeciduous Forest, 1, 15Evergreen Forest, 2, 15Shrub/Scrub, 3, 50Grassland, 4, 125Barren, 5, 220Urban, 6, 210Agriculture, 7, 200Permanent Wetland, 9, 80Mangrove, 10, 80Water, 11, 5Cloud/No Data, 13, 0Equation 2:Relative Erosion Potential (REP) = Slope(%) x precip (mm for peak rainfall month) x soil k-ffactor x relative erosion rate for land cover type / 1000The grid is divided by 1000 and converted to integer for a better data range and easier display.The analysis was implemented in ESRI ArcView 3.2 software, using the map calculator function of Spatial Analyst, which is also available in ArcMap. The raster analysis was done at 30 m resolution in UTM projection (Zone 20N, WGS84.)Two indicators indicative of erosion within the watershed were calculated for each basin:mean REP for the basin (an indicator of average erosion rates for the basin) (REP_MEAN), and total relative erosion within the basin (REP_SUM).Step 2) An indicator of relative sediment delivery at the river mouth was estimated by multiplying total relative erosion in the basin (REP_SUM) by the sediment delivery ratio (SDR) for the basin, which is a function of watershed size. SDR reflects the percentage of erosion within the basin (REP_SUM) which reaches the river mouth. (continued...) |
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Process Date/Time: | 2006-01-01 00:00:00 |
Process Step 2
Description: |
(continued from above) Equation 3:Sediment Delivery Ratio (SDR) = 0.41 x basin area (in sq km)*-0.3. This factor comes from published research on watersheds in the Caribbean. Equation 4:Sediment delivery at the river mouth (SED_DELIV) = REP_SUM x SDR8. The point density tool (Spatial Analyst, ArcGIS) was then used to create a threat layer, using the sediment delivery at the outflow point as input, and a kernel radius of 5 km. 9. This threat layer was then averaged for every benthic habitat polygon (NOAA Benthic Habitats of Puerto Rico and the U.S. Virgin Islands, Kendall et al., 2001) using a zonal function to determine the mean threat. Source used: http://ccma.nos.noaa.gov/products/biogeography/benthic/ (end continuation) |
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Process Date/Time: | 2006-01-01 00:00:00 |
Catalog Details
Catalog Item ID: | 39594 |
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GUID: | gov.noaa.nmfs.inport:39594 |
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 |