Classification of Forest Fragmentation in North America - Direct Download

Metadata Updated: November 21, 2014

This map layer is a grid map of North America including the Caribbean and most of Mexico. The map layer is an excerpt from a global assessment of forest fragmentation (Riitters et al., 2000). Each pixel value represents an index of forest fragmentation for the surrounding 81 sq. km. The map layer was created by applying spatial algorithms to a 1 sq. km. resolution map of global land cover (Loveland and Belward 1997) known as NAIGBP1_2L, obtained from the USGS Center for EROS Distributed Active Archive Center (DAAC) as part of the Global Land Cover Characteristics database (GLCC)(Loveland et al. 1991, 1999). One of six categories of fragmentation was identified for each forested pixel in North America from the amount of forest and its occurrence as adjacent forest pixels within a 9x9 pixel (81 sq. km.) window surrounding the pixel on the original land-cover map. The map layer describes one aspect of forest fragmentation at one scale. The forest fragmentation index is designed to distinguish among types of fragmentation (e.g., edges on the interior versus the exterior of a forest patch) and it also reflects differences in the absolute amount of forest present. However, no distinction was drawn between "natural" and "human-caused" fragmentation. The data available through the National Atlas of the United States are in GeoTIFF format. This is a revised version of the May 2002 map layer, with a corrected shoreline for Greenland. This map layer was previously distributed as the Forest Fragmentation Index Map of North America.

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Dates

Metadata Date April 20, 2006
Metadata Created Date October 3, 2014
Metadata Updated Date November 21, 2014
Reference Date(s) December 1, 2002 (publication)
Frequency Of Update irregular

Metadata Source

Harvested from 1997-2014 Edition of The National Atlas of the United States

Additional Metadata

Resource Type Dataset
Metadata Date April 20, 2006
Metadata Created Date October 3, 2014
Metadata Updated Date November 21, 2014
Reference Date(s) December 1, 2002 (publication)
Responsible Party U.S. Forest Service, Southern Research Station (Point of Contact)
Contact Email
Access Constraints Use Constraints: None. Acknowledgment of the National Atlas of the United States of America and (or) the U.S. Geological Survey would be appreciated in products derived from these data., Access Constraints: None
Bbox East Long -4
Bbox North Lat 83
Bbox South Lat 15
Bbox West Long -166
Coupled Resource
Frequency Of Update irregular
Guid
Harvest Object Id 5fee0254-64e7-4f9d-8abb-ea450fd70a28
Harvest Source Id af1597f1-e9d3-41f1-87aa-4aec2f273cdb
Harvest Source Title 1997-2014 Edition of The National Atlas of the United States
Licence Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty.
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 1992-01-01
Temporal Extent End 1993-01-01

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