Relative Erosion Potential for the Eastern Caribbean by Percentage Tree Cover (270 m grid)

Source: Lauretta Burke and Jon Maidens and contributing authors: Mark Spalding, Philip Kramer, Edmund Green, Suzie Greenhalgh, Hillary Nobles, Johnathan Kool. 2004. Reefs at Risk in the Caribbean.

Relative Erosion Potential for the Eastern Caribbean by Percentage Tree Cover (270 m grid)

Metadata also available as

Identification_Information:

Citation:

Citation_Information:

Originator: World Resources Institute

Publication_Date: 2004

Title:

Relative Erosion Potential for the Eastern Caribbean by Percentage Tree Cover (270 m grid)

Geospatial_Data_Presentation_Form: raster digital data

Series_Information:

Series_Name: Reefs at Risk in the Caribbean

Publication_Information:

Publication_Place: Washington D.C., United States
Publisher: World Resources Institute

Online_Linkage: <http://reefsatrisk.wri.org>

Larger_Work_Citation:

Citation_Information:

Title:: L. Burke and J. Maidens "Reefs at Risk in the Caribbean," (Washington DC, USA: World Resources Institute, 2004)

Description:

Abstract:: The relative erosion rate by land cover type for 1 km grid cells derived for all land draining into the Caribbean Sea and Gulf of Mexico.
Purpose:: The indicators developed by the Reefs at Risk in the Caribbean project enable detailed comparative analyses of threats on many scales. The Reefs at Risk indicators are a simplification of human activities and complex natural processes. This data set was derived at the World Resources Institute for input to the sedimentation and pollution from watershed based sources threat analysis. Agriculture, though important to economic development and food security, is a source of increased sediment, nutrient, and pesticide runoff. Threats from sedimentation and pollution from inland sources were modeled for over 3,000 watersheds discharging into the Caribbean.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: unknown

Currentness_Reference: publication date

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -74.862030
East_Bounding_Coordinate: -57.629496
North_Bounding_Coordinate: 21.070877
South_Bounding_Coordinate: 9.384187

Keywords:

Theme:

Theme_Keyword: threat
Theme_Keyword: coral reefs
Theme_Keyword: pressure
Theme_Keyword: sediment
Theme_Keyword: sedimentation
Theme_Keyword: watershed
Theme_Keyword: basin
Theme_Keyword: plume
Theme_Keyword: erosion
Theme_Keyword: preciptation
Theme_Keyword: soil
Theme_Keyword: slope
Theme_Keyword: erosion
Theme_Keyword: land cover

Place:

Place_Keyword: caribbean
Place_Keyword: central america
Place_Keyword: south america
Place_Keyword: north america
Place_Keyword: insular caribbean
Place_Keyword: gulf of mexico

Access_Constraints: None

Use_Constraints:

Data set is not for use in litigation. While efforts have been made to ensure that these data are accurate and reliable within the state of the art, WRI, cannot assume liability for any damages, or misrepresentations, caused by any inaccuracies in the data, or as a result of the data to be used on a particular system. WRI makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: GIS Lab Manager
Contact_Organization: World Resources Institute

Contact_Address:

Address_Type: mailing and physical address
Address: 10 G Street NE Suite 800
City: Washington DC
State_or_Province: District of Columbia
Postal_Code: 20002
Country: United States

Contact_Voice_Telephone: 202 729 7600

Contact_Facsimile_Telephone: 202 729 7775

Contact_Electronic_Mail_Address: reefsatrisk@wri.org

Hours_of_Service: 9am - 5pm EST

Native_Data_Set_Environment:

Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 2; ESRI ArcCatalog 9.0.0.535

Data_Quality_Information:

The first step of the analysis involves estimating likely relative erosion rates for each 270 m resolution grid cell using a modified, simplified form of the USDA's RUSLE. Information on slope, land cover type, precipitation, and soil porosity was integrated to develop an indicator of relative erosion potential (REP) for all land areas in the Eastern Caribbean sub-region.

Data Sets Use in the 270-m resolution analysis for the Eastern Caribbean

REP relies upon four input data sets: a) Percent slope (derived at 270 m from a 3-cell-by-3-cell smoothed version of the 90-m resolution U.S. National Aeronautics and Space Administration (NASA), "Shuttle Radar Topography Mission" (SRTM) provisional data set, 2003. b) Relative erosion rate by land cover type. The University of Maryland, "Global Percent Tree Cover at a Spatial Resolution of 500 Meters: First Results of the MODIS Vegetation Continuous Fields Algorithm," 2003 was used as the land cover data set for the Eastern Caribbean, since it was the highest-resolution recent data set available for the entire subregion that corresponded well with higher resolution, validated data sets and with expert knowledge of land cover for the sub-region. Percent tree cover was re-mapped into relative erosion rates by land cover class. c) Precipitation for the peak rainfall month (mm), based on monthly precipitation surfaces from Global Arc CD. d) Soil porosity. A polygon database on soil type (FAO, 1995) provided soil texture and porosity attributes.

REP (by 270-m grid cell) = pct_slope * Relative_erosion_rate * Precip_mm * porosity / 1,000 / 4

Note: In this equation, there is a division by 4 in order to adjust for the higher average slopes of the 270-m as compared with - km resolution data

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell
Row_Count: 4544
Column_Count: 6601
Vertical_Count: 1

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Lambert Azimuthal Equal Area

Lambert_Azimuthal_Equal_Area:

Longitude_of_Projection_Center: -76.000000
Latitude_of_Projection_Center: 16.000000
False_Easting: 0.000000
False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: row and column

Coordinate_Representation:

Abscissa_Resolution: 270.000000
Ordinate_Resolution: 270.000000

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: D_Sphere_ARC_INFO
Ellipsoid_Name: Sphere_ARC_INFO
Semi-major_Axis: 6370997.000000
Denominator_of_Flattening_Ratio: infinity

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: rep_270m

Attribute:

Attribute_Label: ObjectID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:: Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Value
Attribute_Definition: relative erosion rate
Attribute_Domain_Values:

Attribute:

Attribute_Label: Count

Distribution_Information:

Resource_Description: Downloadable Data

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size: 1.204

Metadata_Reference_Information:

Metadata_Date: 20041221

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: World Resources Institute

Contact_Address:

Address_Type: 10 G Street, NE Suite # 800
City: Washington, DC
State_or_Province: District of Columbia
Postal_Code: 20002
Country: United States

Contact_Voice_Telephone: 202 729 7600

Contact_Facsimile_Telephone: 202 729 7775

Contact_Electronic_Mail_Address: reefsatrisk@wri.org

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

Generated by mp version 2.8.6 on Tue Dec 21 12:53:10 2004

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