Presentations text content in ROS Step by Step Getting Started
Slide1
ROS
Step by Step
Slide2Getting Started
ROS determination is based on the transportation system and topography (specifically, slope)
Slide3Step 1
Classify routes as improved, primitive or non-motorized.
Better than Primitive Routes
Primitive Motorized Routes
Non-motorized Routes
Slide4Step 1
To reduce computational time, clip routes to those within 3 miles of project area.
Slide5Step 2
Prepare a slope raster (percent) and 2 route
rasters
- improved roads and, all motorized routes.
Slide6Step 2 (continued)
Prepare a cost raster for travel from primitive motorized routes
(slope / 3).
Slide7Step 2 (continued)
Prepare a second cost raster for travel from improved routes.
(slope / 3)
Slide8Step 3
Compute
costdistance
raster for improved roads.
Slide9Step 3 (cont)
Compute a second
costdistance
raster for all motorized routes.
Slide10Step 4
Reclassify the
costdistance
raster for improved roads into preliminary zones.
Slide11Step 4 (cont)
Reclassify the
costdistance
raster for all motorized routes into preliminary zones.
Slide12Step 4 (cont)
Combine the reclassified maps.
Areas of difference define SPM and compromised SPNM.
Slide13Step 5
Using all motorized routes, determine route density using focal function.
Slide14Step 5 (cont)
Reclassify the route density into Rural, Urban and Other classes.
rural
urban
Slide15Step 6
Combine the density classes with the cost mapping.
Assign draft ROS classes.
Slide16Step 7
Develop combined PR / SPNM polygons.
PR and SPNM can be undersized when there are adjoining areas.
Slide17Step 7 (cont)
Develop combined SPM / SPNM polygons.
SPM can be undersized when there are adjoining SPNM areas.
Slide18Step 7 (cont)
Add the expanded area values to the draft ROS zones.
Slide19Step 8
Make final designations based on sizes and adjacent areas.
Slide20Classify U & R.
Classify RN.
Classify SPM > 2500
Classify SPM < 2500
Reclassify SPM < 400 as RN
Slide21Classify SPNM > 2500
Classify SPNM < 2500
Reclassify SPNM < 2500 to SPM
Reclassify SPNM < 2500 to RN
Reclassify SPNM < 400 to RN
Slide22Classify PR > 5000
Classify PR < 5000 adjacent to SPNM
Reclassify PR < 1000 adjacent to SPNM to SPNM
Reclassify PR < 1000 not adjacent to SPNM to RN
Slide23Step 9
Dissolve on ROS value
Clip to Boundary
Review Results
Slide24Step-by-Step
ROS Step by Step Getting Started
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