Cfr. pdf. "‘Effective mesh density’: a useful measure of landscape fragmentation"
http://webcache.googleusercontent.com/search?q=cache:5LrWXdD3rUYJ:ec.europa.eu/environment/integration/research/newsalert/pdf/264na2_en.pdf+&cd=7&hl=it&ct=clnk&gl=it

http://www.eea.europa.eu/publications/landscape-fragmentation-in-europe/

http://www.eea.europa.eu/data-and-maps/figures/effective-mesh-density-number-of

utilizzo ARCGIS tool "Effective Mesh Size Landscape Fragmentation Metric" scaricabile da sito ESRI:
http://arcscripts.esri.com/details.asp?dbid=15970