The Hugag is a curious mythical beast with strong preferences for terrain configuration:

The Hugag is a curious mythical beast with strong preferences for terrain configuration:

Prefers low elevations (severe nose bleeds at higher altitudes) Prefers gentle slopes (fear of falling over and unable to get up) Prefers southerly aspects (a place in the sun)

Supplemental Slide Set for GeoWorld Beyond Mapping Column, August 2004

See http://www.innovativegis.com/basis/MapAnalysis/Default.html, select Topic 22

Hugags like…

Gentle Slopes (under 30%)

Southerly Aspects (E-W orientation)

Lower Elevations (under 1800 feet)

0 1500ft

…how would you map Hugag habitat?

Hugags like…

Gentle Slopes (under 30%)

Southerly Aspects (E-W orientation)

Lower Elevations (under 1800 feet)

0 1500ft

Too Steep

Manual Drafting

Hugags like…

Gentle Slopes (under 30%)

Southerly Aspects (E-W orientation)

Lower Elevations (under 1800 feet)

0 1500ft

Not southerly

Manual Drafting

Hugags like…

Gentle Slopes (under 30%)

Southerly Aspects (E-W orientation)

Lower Elevations (under 1800 feet)

0 1500ft

Too High

Manual Drafting

Hugags like…

Gentle Slopes (under 30%)

Southerly Aspects (E-W orientation)

Lower Elevations (under 1800 feet)

0 1500ft

Manual Drafting – McHarg Overlay

Too Steep

Too Steep

ManualMap Overlay

Not Southerly

Not Southerly

Too High

Too High

Hugags like…

Gentle Slopes (under 30%)

Southerly Aspects (E-W orientation)

Lower Elevations (under 1800 feet)

0 1500ft

Too Steep= 0

Computer Solution

= 1

Hugags like…

Gentle Slopes (under 30%)

Southerly Aspects (E-W orientation)

Lower Elevations (under 1800 feet)

0 1500ft

Not southerly= 0

Computer Solution

= 1

= 1

Hugags like…

Gentle Slopes (under 30%)

Southerly Aspects (E-W orientation)

Lower Elevations (under 1800 feet)

0 1500ft

Too High= 0

Computer Solution

= 1

= 1

= 1

Hugags like…

Gentle Slopes (under 30%)

Southerly Aspects (E-W orientation)

Lower Elevations (under 1800 feet)

0 1500ft

= 1

= 1

= 1

Binary Overlay

Times1 * 1 * 1 = 1

Hugags like…

Gentle Slopes (under 30%)

Southerly Aspects (E-W orientation)

Lower Elevations (under 1800 feet)

0 1500ft

= 1

= 1

= 1

Ranking Overlay

Plus1 + 1 + 1 = 3

0 1500ft

Gentle Slopes (under 30%)

Southerly Aspects (E-W orientation)

Lower Elevations (under 1800 feet)

= 1

= 4

= 2

Plus1 + 2 + 4 = 7

124

Binary-Progression Overlay

0 1500ft

GentleSlopes = 5.0 (22%)

SoutherlyExposed = 6.0 (West)

LowerElevation = 5.0 (1,300)

Average5.0 + 6.0 + 5.0 = 5.3

Hugags like… (on a scale of 1 worst to 9 best)

Rating Overlay (Goodness Scale 1 to 9)

0 1500ft

Constraints Overlay

Covertype

Water MaskWater= 0Land= 1

HabitatRatingBad= 1 toGood= 9

Good 9

Bad 1

OK= 4.5

Lake 0

Water = 0 times any Habitat Rating = 0

Lakes

Hugags like…

Hugags like… Gentle Slopes, Southerly Aspects, Lower Elevations

Best Habitat

Suitability draped over 3D plot of Elevation

(West)

(South)

Applying the Average Suitability model to a larger area shows its strong relationship to terrain configuration. Note that the areas of best habitat (dark green) occur on the fairly gentle slopes that are southerly oriented and at lower elevations. Note that the worst areas (bright red) occur on steep, northerly slopes at higher elevations.

Best Habitat