polyline ZM process Viewshed

[juanvalencia]

3d polyline viewshed

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.)

but when the process made without the field spot, the process is effected without any problem

I await your prompt response
thanks

juan miguel

[JeffreySwain]

What is the elevation of the polyline?  Is it varialble or one value?  Is 2 the desired elevation of the line or an offset?  In terms of the viewshed tool, the SPOT field is to describe the elevation of a point for analysis, not offset the elevation.  

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.

  Use the Feature Vertices to Point tool to  export the vertices of the line, create the SPOT field and populate it with the values you need or use the OFFSETA to add an offset to the existing elevation.