Step By Step - PowerPoint Presentation

Slide1

Step By StepSlide2

Step 1

Building Base DataSlide3

Concern

Determine Concern

3 levels, based on number of viewers and area attributes.

Route system usually provides the base.Slide4

Concern Level 1

State and Federal Highways

Wild/Scenic Rivers

Forest Highways, Scenic Byways and major recreation sites & accessSlide5

Concern Level 2

County Roads

Wilderness and wilderness access trails

Other scenic routesSlide6

Concern Level 3

Other Forest RoadsSlide7

Prepare Concern

Buffer Project Area

Clip Concern Layer

Separate Concern by levels

12 milesSlide8

Build Surface

Clip Elevation

Calculate roughness to use as impedanceSlide9

Step 2

Build View ZonesSlide10

Distance ZonesSlide11

Adding TopographySlide12

Cost Distance

Using the impedance raster compute the cost distance for each of the concern layers.Slide13

Concern level 1

Calculate

Reclassify into zones

FG1

MG1

BG1Slide14

Concern level 2

Calculate

Reclassify into zones

FG1

MG1

BG1Slide15

Concern level 3

Calculate

Reclassify into zones

FG1

MG1

BG1Slide16

Step 3

Build View PointsSlide17

Create Fishnet

Create 1 km Fishnet using

XToolsSlide18

Build Level 1 points

Combine fishnet with concern 1 routes using ‘Feature to Line’ tool.

Delete Fishnet (concern = 0)

Convert segments to points with ‘Feature to Point’ toolSlide19

Repeat for level 2

Combine fishnet with concern 2 routes using ‘Feature to Line’ tool.

Delete Fishnet (concern = 0)

Convert segments to points with ‘Feature to Point’ toolSlide20

And again

for level 3

Combine fishnet with concern 2 routes using ‘Feature to Line’ tool.

Delete Fishnet (concern = 0)

Convert segments to points with ‘Feature to Point’ toolSlide21

Group for Processing

Subdivide viewpoints into groups of 200-300 points.

Use buffered clips of elevation, based on the zones.Slide22

Viewsheds: Level 1

Calculate

viewsheds

for each zone.Slide23

Viewsheds: Level 2

Repeat modeling for Concern Level 2 points, by each zoneSlide24

Viewsheds: Level 3

And again, model

viewsheds

for the concern level 3 points, by zone.Slide25

Combine Viewsheds

Combine

viewsheds

for each concern level using MAXIMUM methodSlide26

Step 4

Combine view zones with

viewsheds

.Slide27

Use Viewshed to mask ZonesUnmask ForegroundRedraw Zones

Masking

ViewshedsSlide28

Level 1

Viewsheds

Extract Foreground Zone

Set up not seen area mask for concern level

Mask middle and background zones

FG1

MG1

MG1

BG1

BG1

Not seenSlide29

Level 2 Viewsheds

Extract Foreground 2 Zone

Set up not seen area mask for concern level

Mask middle and background zones

FG2

MG2

MG2

BG2

Not seenSlide30

Level 3 Viewsheds

Extract Foreground 3 Zone

Set up not seen area mask for concern level

Mask middle and background zones

FG3

MG3

MG3

BG3

Not seenSlide31

Putting it together

Combine the resulting

rastersSlide32

Final Processing

Convert to polygons

Classify grid values and dissolve

Eliminate zones less than 100 acres

Clip to boundarySlide33

A Closer LookSlide34

References

Landscape Aesthetics-

Agriculture Handbook 701

ESRI Spatial Analyst Help Files

USFS-2010 David C.

McMorranSlide35

Step By Step