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Habitat Effectiveness Index. A model to help evaluate elk winter range in the Blue Mountains of eastern Oregon and Washington. Four Components. HE S -- Size and spacing of cover and forage areas Habitat suitability weighted depending on distance from edge of cover or forage. Four Components.

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Habitat Effectiveness Index

A model to help evaluate elk winter range in the Blue Mountains of eastern Oregon and Washington


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Four Components

HES -- Size and spacing of cover and forage areas

Habitat suitability weighted depending on distance from edge of cover or forage


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Four Components

HER -- Roads open to traffic per unit of area

The greater the road density, the less suitable the habitat

Photo by Mark Penninger


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Four Components

HEF -- Quality and quantity of forage

Affected by season of year and amount of other grazing

Photo by Mark Penninger


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Four Components

HEC – Cover Quality

Affected by relative amounts of satisfactory and marginal cover

Photo by Robin Garwood


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Habitat Effectiveness Index

  • The geometric mean of the 4 component values

  • HESRFC = (HES x HER x HEF x HEC)1/4

  • optimum conditions exist only if all values are 1.0


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Modeling the HEI

ArcInfo Workstation – AML (A. Kramer and M. Braymen, Wallowa-Whitman N.F., 1997)

ArcGIS – HEI model (D. Stockdale, 2007)

Combination of VBA, Model Builder and Python scripting


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The Geoprocessor Object

VBA:

Dim GP As Object

Set GP = CreateObject("esriGeoprocessing.GPDispatch.1")

Python:

import win32com.client

GP = win32com.client.Dispatch("esriGeoprocessing.GPDispatch.1")

GP.HEIhes_hei strCoverName ‘runs a Python script

GP.TableToTable_conversion strInfraTableName, _ ‘ runs a geoprocessing tool

"C:\workspace\hei\hei.mdb", "RoadInfraTable"


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HES model


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HES model


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HES model


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HES model


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HES model


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HES model


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HES model


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HES model


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HER model


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HER model


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HER model


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HER model


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HER model


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HEC model








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