ROS Step by Step Getting Started PowerPoint Presentation, PPT - DocSlides

ROS

Step by Step

Getting Started

ROS determination is based on the transportation system and topography (specifically, slope)

Step 1

Classify routes as improved, primitive or non-motorized.

Better than Primitive Routes

Primitive Motorized Routes

Non-motorized Routes

Step 1

To reduce computational time, clip routes to those within 3 miles of project area.

Step 2

Prepare a slope raster (percent) and 2 route

rasters

- improved roads and, all motorized routes.

Step 2 (continued)

Prepare a cost raster for travel from primitive motorized routes

(slope / 3).

Step 2 (continued)

Prepare a second cost raster for travel from improved routes.

(slope / 3)

Step 3

Compute

costdistance

raster for improved roads.

Step 3 (cont)

Compute a second

costdistance

raster for all motorized routes.

Step 4

Reclassify the

costdistance

raster for improved roads into preliminary zones.

Step 4 (cont)

Reclassify the

costdistance

raster for all motorized routes into preliminary zones.

Step 4 (cont)

Combine the reclassified maps.

Areas of difference define SPM and compromised SPNM.

Step 5

Using all motorized routes, determine route density using focal function.

Step 5 (cont)

Reclassify the route density into Rural, Urban and Other classes.

rural

urban

Step 6

Combine the density classes with the cost mapping.

Assign draft ROS classes.

Step 7

Develop combined PR / SPNM polygons.

PR and SPNM can be undersized when there are adjoining areas.

Step 7 (cont)

Develop combined SPM / SPNM polygons.

SPM can be undersized when there are adjoining SPNM areas.

Step 7 (cont)

Add the expanded area values to the draft ROS zones.

Step 8

Make final designations based on sizes and adjacent areas.

Classify U & R.

Classify RN.

Classify SPM > 2500

Classify SPM < 2500

Reclassify SPM < 400 as RN

Classify SPNM > 2500

Classify SPNM < 2500

Reclassify SPNM < 2500 to SPM

Reclassify SPNM < 2500 to RN

Reclassify SPNM < 400 to RN

Classify 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

Step 9

Dissolve on ROS value

Clip to Boundary

Review Results

Step-by-Step