Effective Mesh Size: Quantifying Landscape Fragmentation

Landscape fragmentation due to urban development, transportation infrastructure, and agriculture poses a threat to environmental integrity. There is a need to quantify the level of landscape fragmentation in an ecologically meaningful way for inclusion in planning and decision-making. Effective mesh size (meff) is an ecologically relevant metric that quantifies landscape fragmentation based on the probability that two randomly chosen points in a region are located in the same non-fragmented patch.

 
Download Effetive Mesh Size ArcGIS Tool:
 
 
 
Demo GIS files for calculating Effective Mesh Size: Dowload files here
 
 
Publications:

 

Additional uncaught exception thrown while handling exception.

Original

PDOException: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '10891405' for key 'PRIMARY': INSERT INTO {accesslog} (title, path, url, hostname, uid, sid, timer, timestamp) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7); Array ( [:db_insert_placeholder_0] => Effective Mesh Size: Quantifying Landscape Fragmentation [:db_insert_placeholder_1] => node/31 [:db_insert_placeholder_2] => [:db_insert_placeholder_3] => 54.242.85.89 [:db_insert_placeholder_4] => 0 [:db_insert_placeholder_5] => JJLcUlQhEZ4OK4eC1f9ahBwuJ_hu_hBPHrJuwWlZJhE [:db_insert_placeholder_6] => 431 [:db_insert_placeholder_7] => 1397864623 ) in statistics_exit() (line 93 of /nfs/bronfs/uwfs/hw00/d11/girvetz/drupal/modules/statistics/statistics.module).

Additional

PDOException: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '8938970' for key 'PRIMARY': INSERT INTO {watchdog} (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9); Array ( [:db_insert_placeholder_0] => 0 [:db_insert_placeholder_1] => php [:db_insert_placeholder_2] => %type: !message in %function (line %line of %file). [:db_insert_placeholder_3] => a:6:{s:5:"%type";s:12:"PDOException";s:8:"!message";s:865:"SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '10891405' for key 'PRIMARY': INSERT INTO {accesslog} (title, path, url, hostname, uid, sid, timer, timestamp) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7); Array ( [:db_insert_placeholder_0] => Effective Mesh Size: Quantifying Landscape Fragmentation [:db_insert_placeholder_1] => node/31 [:db_insert_placeholder_2] => [:db_insert_placeholder_3] => 54.242.85.89 [:db_insert_placeholder_4] => 0 [:db_insert_placeholder_5] => JJLcUlQhEZ4OK4eC1f9ahBwuJ_hu_hBPHrJuwWlZJhE [:db_insert_placeholder_6] => 431 [:db_insert_placeholder_7] => 1397864623 ) ";s:9:"%function";s:17:"statistics_exit()";s:5:"%file";s:77:"/nfs/bronfs/uwfs/hw00/d11/girvetz/drupal/modules/statistics/statistics.module";s:5:"%line";i:93;s:14:"severity_level";i:3;} [:db_insert_placeholder_4] => 3 [:db_insert_placeholder_5] => [:db_insert_placeholder_6] => http://faculty.washington.edu/girvetz/drupal/effective_mesh_size [:db_insert_placeholder_7] => [:db_insert_placeholder_8] => 54.242.85.89 [:db_insert_placeholder_9] => 1397864624 ) in dblog_watchdog() (line 154 of /nfs/bronfs/uwfs/hw00/d11/girvetz/drupal/modules/dblog/dblog.module).