topic Lake Hydrology Isopleth Issues - HELP! in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/lake-hydrology-isopleth-issues-help/m-p/746207#M10816 <HTML><HEAD></HEAD><BODY><SPAN>I am trying to create an isopleth map to illistrate the dilution of nutrients through a lake system.&nbsp; Is it possible (how do I?), take into consideration the barriers (islands) in the lake.&nbsp; Isopleth lines currently cross through the islands as opposed to following teh hydrologic flow around the islands? </SPAN><BR /><BR /><SPAN>Anyone encounter this issue, how can I resolve?</SPAN></BODY></HTML> Fri, 12 Nov 2010 20:56:30 GMT SethBohnet 2010-11-12T20:56:30Z Lake Hydrology Isopleth Issues - HELP! https://community.esri.com/t5/arcgis-spatial-analyst-questions/lake-hydrology-isopleth-issues-help/m-p/746207#M10816 <HTML><HEAD></HEAD><BODY><SPAN>I am trying to create an isopleth map to illistrate the dilution of nutrients through a lake system.&nbsp; Is it possible (how do I?), take into consideration the barriers (islands) in the lake.&nbsp; Isopleth lines currently cross through the islands as opposed to following teh hydrologic flow around the islands? </SPAN><BR /><BR /><SPAN>Anyone encounter this issue, how can I resolve?</SPAN></BODY></HTML> Fri, 12 Nov 2010 20:56:30 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/lake-hydrology-isopleth-issues-help/m-p/746207#M10816 SethBohnet 2010-11-12T20:56:30Z Re: Lake Hydrology Isopleth Issues - HELP! https://community.esri.com/t5/arcgis-spatial-analyst-questions/lake-hydrology-isopleth-issues-help/m-p/746208#M10817 <HTML><HEAD></HEAD><BODY><SPAN>convert your the poly-line feature of your islands to points and assign it a value of 0. </SPAN><BR /><SPAN>Add these to your xyz file and re-grid your data. I have done this with bathymetry data around islands and coastlines and it seems to work. Just keep in mind you have now created a bunch of virtual values.</SPAN></BODY></HTML> Mon, 22 Nov 2010 08:31:28 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/lake-hydrology-isopleth-issues-help/m-p/746208#M10817 WilhelmVan_Zyl 2010-11-22T08:31:28Z