I have performed a bare-earth viewshed analysis of a roadway corridor using a DEM, but upon further inspection on Google Streetview, realize that part of the road has dense trees along it. I need to figure out a way to incorporate this treeline into the analysis. It seems that the OFFSETB field will accomplish what I need: "The OFFSETB item indicates a vertical distance in surface units to be added to the z-value of each cell as it is considered for visibility." The steps I would follow would be:
1) Segment the observer line feature for where trees are located
2) Add an OFFSETB field and add a value of 10m for the treeline segment
Am I understanding the OFFSETB function correctly?