Generating cross-track slope shader

Robster

Hello brainy people

I have a DTM loaded in Global Mapper representing the seabed, together with a polyline along it representing a subsea cable.  I'd like to shade the DTM based on the cross-slope value (i.e. the slope perpendicular to the cable).  I've absolutely no idea how to do this.  Can anybody help???

Many thanks

Rob

Subsea4life

You would have to find a way of generating perpendicular lines along your primary line, attach bathy grid values to those lines.