topic polyline ZM process Viewshed in 3D Questions https://community.esri.com/t5/3d-questions/polyline-zm-process-viewshed/m-p/81091#M507 <HTML><HEAD></HEAD><BODY><SPAN>3d polyline viewshed</SPAN><BR /><BR /><SPAN>executed the command viewshed to polyline zm and your database add you spot the field and we value numeric entry of 2 in the process i get an error. (bug 010067 error in executing grid expression. not present valid observation point.)</SPAN><BR /><BR /><SPAN>but when the process made without the field spot, the process is effected without any problem</SPAN><BR /><BR /><SPAN>I await your prompt response</SPAN><BR /><SPAN>thanks</SPAN><BR /><BR /><SPAN>juan miguel</SPAN></BODY></HTML> Mon, 06 Feb 2012 14:22:17 GMT juanvalencia 2012-02-06T14:22:17Z polyline ZM process Viewshed https://community.esri.com/t5/3d-questions/polyline-zm-process-viewshed/m-p/81091#M507 <HTML><HEAD></HEAD><BODY><SPAN>3d polyline viewshed</SPAN><BR /><BR /><SPAN>executed the command viewshed to polyline zm and your database add you spot the field and we value numeric entry of 2 in the process i get an error. (bug 010067 error in executing grid expression. not present valid observation point.)</SPAN><BR /><BR /><SPAN>but when the process made without the field spot, the process is effected without any problem</SPAN><BR /><BR /><SPAN>I await your prompt response</SPAN><BR /><SPAN>thanks</SPAN><BR /><BR /><SPAN>juan miguel</SPAN></BODY></HTML> Mon, 06 Feb 2012 14:22:17 GMT https://community.esri.com/t5/3d-questions/polyline-zm-process-viewshed/m-p/81091#M507 juanvalencia 2012-02-06T14:22:17Z Re: polyline ZM process Viewshed https://community.esri.com/t5/3d-questions/polyline-zm-process-viewshed/m-p/81092#M508 <HTML><HEAD></HEAD><BODY><SPAN>What is the elevation of the polyline?&nbsp; Is it varialble or one value?&nbsp; Is 2 the desired elevation of the line or an offset?&nbsp; In terms of the viewshed tool, the </SPAN><A href="http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Performing_visibility_analysis_with_Viewshed_and_Observer_Points/009z000000v8000000/">SPOT</A><SPAN> field is to describe the elevation of a point for analysis, not offset the elevation.&nbsp;&nbsp; </SPAN><BR /><BR /><SPAN>There is a bug report for the use of SPOT on a line feature, so I would recommend if you want to use an elevation other than the interpolated value of the line based on the surface raster, convert the line to points. </SPAN><BR /><BR /><SPAN>&nbsp; Use the Feature Vertices to Point tool to&nbsp; </SPAN><A href="http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00170000003p000000">export the vertices of the line</A><SPAN>, create the SPOT field and populate it with the values you need or use the OFFSETA to add an offset to the existing elevation.</SPAN></BODY></HTML> Tue, 07 Feb 2012 13:40:34 GMT https://community.esri.com/t5/3d-questions/polyline-zm-process-viewshed/m-p/81092#M508 JeffreySwain 2012-02-07T13:40:34Z