STL Topo question. Smoothing

When I carve a mountainous area (Vancouver Island BC)
it looks too jagged, it looks like the 1/8" finishing bit was stabbed down into the carve many many times, if I increase the stepover (I think it was at 5% +/-) will that tend to smooth the appearance somewhat?

It depends, but the larger the stepover, the larger the scalloping caused by the stepover, that said typically a 8-10% is plenty low enough to not have visible scallop lines while still getting good detail… How To Choose a Stepover for 3D Profiling - CNCCookbook: Be A Better CNC'er