Identifying Extended High Ridges

Identifying Valley Bottom Lands

Identifying Dam Reservoir Extent

Characterizing Major Terrain Features

1) SCAN Elevation Average Ignore -1 Within 3 Circle For Elev_smooth3

Elev_smooth3

3D Grid Display

3D LatticeDisplay

with 2D projection

Elevation

2300

2600

2) DRAIN Entire Over Elev_smooth3 Simply Steepest For Flowmap

4) SCAN Raw_ridges Majority Ignore -1 Within 1 Circle For Ridges

3) RENUMBER Flowmap Assigning 0 To 2 Thru 3000 For Raw_ridges

Ridges aboveMean Elevation

of 2440

5) CLUMP Ridges at 1 diagonally FOR Individual_ridges

Ridges6) COMPOSITE Individual_ridges with Elevation minimum ignore -1for Ridges_minElev

2424

7) RENUMBER Ridges_minElev assigning 0 to 0 thru 2440 assigning 1 to 2440 thru 10000 for High_ridges

9) RENUMBER Slopemap Assigning 1 To 0 Thru 5 Assigning 0 To 5 Thru 100 For Gentle_slopes

10) SCAN Gentle_slopes Majority Ignore -1 Within 1 Circle For Gentle_slopes2

8) SLOPE Elevation Fitted For Slopemap

50%

35%

11) SPREAD High_ridges To 100 Thru Gentle_slopes2 Simply For Expanded_ridges

1) CALCULATE ((Elev_S – 2564) * -1) For Inverted_ElevS3

2) DRAIN Entire Over Inverted_Elev_S3 Simply Steepest For Flow_inverted

3) RENUMBER Flow_inverted Assigning 0 TO 1 Thru 80 Assigning 1 TO 80 Thru 1000 For RawRidges_Inverted

5) CLUMP Ridges_Inverted At 1 Diagonally For IndRidges_Inverted

6) Composite IndRidges_Inverted With Elevation Minimum Ignore -1 For Ridges_minElev_Inverted

4) SCAN RawRidges_inverted Majority Ignore -1 Within 1 Circle For Ridges_Inverted

8) SPREAD High_ridges_inverted To 100 Thru Gentle_slopes2 Simply For Expanded_ridges_inverted

7) RENUMBER Ridges_minElev_Inverted Assigning 0 TO 0 Thru 2440 Assigning 1 TO 2440 Thru 10000 For High_ridges_inverted

Extended High Ridges

…using a Standard Elevation Surface

Extended High Ridges

…using an Inverted Elevation Surface

…similar results

1) SLOPE Elev_smooth3 Fitted For Slopemap

50%

35%

2) RENUMBER Slopemap Assigning 1 To 0 Thru 6 Assigning 0 To 6 Thru 100 For Gentle_slopes

3) SCAN Gentle_slopes Majority Ignore -1 Within 1 Circle For Gentle_slopes2

4) SPREAD WaterTo 36 Thru Gentle_slopes2 Simply For Valley_bottoms

1) RENUMBER Elevation Assigning 2383 To 0 Thru 2383 Assigning 0 To 2383 Thru 10000 For Elev_2383

5) COVER Elevation With Dam_Lake For Elev_dam_lake

2) COVER Elev_2383 With Dam_2390 For Elev_dam

3) CLUMP Elev_dam At 1 Orthogonally For Elev_dam_clumps

4) RENUMBER Elev_Dam _clumps Assigning 0 To 1 Thru 2 Assigning 2383 To 3 Assigning 2390 To 4 Thru 7 For Dam_lake

Characterizing Major Terrain Features

Identifying Extended High Ridges…could include aspect and distance to road in refining best ridges for Wind Power development— how?

Identifying Valley Bottom Lands

…could include vegetation type in the extended riparian zone— how?

Identifying Dam Reservoir Extent

…could calculate reservoir volume capacity at various surface water heights— how?

Just for fun …you’re having fun, right?

Let’s compare the effect of changing a bit of model logic…

The method of determining ridge elevation from—

Minimum Elevation for each candidate ridge

versus

Average Elevation for each candidate ridge

…in determining high ridges

Ridges aboveMean Elevation

of 2440

5) CLUMP Ridges at 1 diagonally FOR Individual_ridges

Ridges6) COMPOSITE Individual_ridges with Elevation minimum ignore -1for Ridges_minElev

2424

7) RENUMBER Ridges_minElev assigning 0 to 0 thru 2440 assigning 1 to 2440 thru 10000 for High_ridges

9) RENUMBER Slopemap Assigning 1 To 0 Thru 5 Assigning 0 To 5 Thru 100 For Gentle_slopes

10) SCAN Gentle_slopes Majority Ignore -1 Within 1 Circle For Gentle_slopes2

8) SLOPE Elevation Fitted For Slopemap

50%

35%

11) SPREAD High_ridges To 100 Thru Gentle_slopes2 Simply For Expanded_ridges

Ridges aboveMean Elevation

of 2440

5) CLUMP Ridges at 1 diagonally for Individual_ridges

Ridges6) COMPOSITE Individual_ridges with Elevation average ignore -1for Ridges_avgElev

2424

7) RENUMBER Ridges_avgElev assigning 0 to 0 thru 2440 assigning 1 to 2440 thru 10000 for High_ridges

9) RENUMBER Slopemap assigning 1 to 0 thru 5 assigning 0 to 5 thru 100 for Gentle_slopes

10) SCAN Gentle_slopes majority ignore -1 within 1 circle for Gentle_slopes2

8) SLOPE Elevation fitted for Slopemap

50%

35%

11) SPREAD High_ridges to 100 thru Gentle_slopes2 simply for Expanded_ridges

Extended Ridges based on

Minimum Elevation

Extended Ridges based on

Average Elevation

…domain expertise is needed to refine any GIS procedure or model

More “fun” …identifying upland, low land and side slopes

1 Not a valley bottomor “Toe Slope”

2 Not an upland ridgeor “Upland Slope”

Upland Ridges

Valley Bottoms

RENUMBER Valley_bottoms assigning 0 to 0 thru 35 assigning 1 to 35 thru 36 for Not_valleyBottom

RENUMBER Upland_ridges assigning 0 to 0 thru 99 assigning 2 to 99 thru 100 for Not_uplandRidge

Compute Not_uplandRidge plus Not_valleyBottomfor Combined_slopes

Combined Slopes