Modeling ROS

A new look at an old problem

primitive

Semi-primtiveNon-motorized

Semi-primitive, motorized

Roaded Natural

Rural

Urban

ROS Settings

Basic ROS Distances

The fine print

Steep Terrain is harder to cross

3 miles

PR

½ mileSPNM

½ mile

RNRN

SPM

SPM

SPM

SPM

SPM

SPM(cut off bySteep Slopes)

Very Steep Slopes(narrows zones)

Flat ground(widen zones)

SPNM(access by trails)

PR

RN

RN

SPM

RN

RN

R

R

R

CongestedAreas

Modeling using Terrain

Clean up slivers

Add Attribute Fields

Assign ROS class based on size and zone

Final Clean Up

Putting it into Perspective

Summary

• Use Travel Management work to determine 2 road classes and trails.

• Using slope as impedance, calculate costdistance for good roads and all roads

• Reclassify costdistance into zones- intersection of two maps determines SPM

• Use focal function to determine road density.• Reclass density to determine R and U classes

Uses of ROS

• Compare effects of alternatives on Recreation setting

• Provide input to forest plans and revision