Description: Shannon's diversity (SHDIV) - equal to "minus the sum, across all patch types, of the proportional abundance of each patch type multiplied by that proportion. Shannon's index is somewhat more sensitive to rare patch types than Simpson's diversity index."
Futher description of these and other class, patch, and landscape metrics can be found online in the Fragstats software documentation file which as of 15 June 2013 was available for download at http://www.umass.edu/landeco/research/fragstats/documents/fragstats_documents.html.
Description: Shannon's Evenness (SHE) - "the observed Shannon's Diversity Index divided by the maximum Shannon's Diversity index fo the number of patch types. Shannon's evenness index is expressed such that an even distribution of area among patch types results in maximum evenness."
Futher description of these and other class, patch, and landscape metrics can be found online in the Fragstats software documentation file which as of 15 June 2013 was available for download at http://www.umass.edu/landeco/research/fragstats/documents/fragstats_documents.html.
Description: Simpson's Diversity (SIDIV) - equal to "minus the sum, across all patch types, of the proportional abuncance of patch type squared. Simpson's index is less sensitive to the presence of rare types [of land use/cover patches]. Simpson's index represents the probability that any two pixels selected at random would be different patch types.
Indexes calculated for NLCD 2006 forest, shrubland, herbaceous, and wetland classes within NHD HUC 12 watersheds. Futher description of these and other class, patch, and landscape metrics can be found online in the Fragstats software documentation file which as of 15 June 2013 was available for download at http://www.umass.edu/landeco/research/fragstats/documents/fragstats_documents.html.
Description: Simpson's Evenness (SIE) - "the observed Simpson's Diversity Index divided by the maximum Simpson's Diversity Index for that number of patch types. Simpson's evenness index is expressed such that an even distribution of area among patch types results in maximum evenness." Indexes calculated for NLCD 2006 forest, shrubland, herbaceous, and wetland classes within NHD HUC 12 watersheds. Futher description of these and other class, patch, and landscape metrics can be found online in the Fragstats software documentation file which as of 15 June 2013 was available for download at http://www.umass.edu/landeco/research/fragstats/documents/fragstats_documents.html.
Description: Shape Index Mean (SIM) - a standardized measure of the amount of edge (or edge density) adjusted based on the overall size of the landscape
Description: Total Core Area (TCA) - the sum total core area present within the landscape corresponding to NLCD 2006 forest class type. In this case, core area is defined as the area of a patch at least 90 meters from the patch edge.
Description: Shape Index Mean (SIM) - a standardized measure of the amount of edge (or edge density) adjusted based on the overall size of the landscape
Description: Total Core Area (TCA) - the sum total core area present within the landscape corresponding to NLCD 2006 shrubland class type. In this case, core area is defined as the area of a patch at least 90 meters from the patch edge.
Description: Shape Index Mean (SIM) - a standardized measure of the amount of edge (or edge density) adjusted based on the overall size of the landscape
Description: Total Core Area (TCA) - the sum total core area present within the landscape corresponding to NLCD 2006 herbaceous class type. In this case, core area is defined as the area of a patch at least 90 meters from the patch edge.
Description: Shape Index Mean (SIM) - a standardized measure of the amount of edge (or edge density) adjusted based on the overall size of the landscape
Description: Total Core Area (TCA) - the sum total core area present within the landscape corresponding to NLCD 2006 wetland class type. In this case, core area is defined as the area of a patch at least 90 meters from the patch edge.