anchor.diff:              z = 12;
             } else {
               y = (y > Math.pow(2,z) ? y % Math.pow(2,z) : y);
  -            
  +
               if (x >= Math.pow(2,z)) {
                 x = x % Math.pow(2,z);
               } else if (x < 0) {
  
positive.code:         if (slug === 'biodiversity_hotspots') {
            GFW.app.closeInfowindows();
          }
  
          if (slug === 'ifl_2000') {
            if (ifl_2013.attributes['visible']) {
              GFW.app.removeLayer(ifl_2013);
            }
          } else if (slug === 'ifl_2013_deg') {
            if (ifl_2000.attributes['visible']) {
              GFW.app.removeLayer(ifl_2000);
            }
          } 
  
          if (visible) {
            GFW.app.addLayer(this.layer);
            ga('send', 'event', 'Filter', 'Toggle', slug);
  
negative.code:             z = 12;
            } else {
              y = (y > Math.pow(2,z) ? y % Math.pow(2,z) : y);
  
              if (x >= Math.pow(2,z)) {
                x = x % Math.pow(2,z);
              } else if (x < 0) {
  