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Table 2 Geospatial data layers used to generate the ignition density grid.

From: Quantifying the Threat of Unsuppressed Wildfires Reaching the Adjacent Wildland-Urban Interface on the Bridger-Teton National Forest, Wyoming, USA

Predictor layer

Layer description

Source

Vegetation type

Biophysical setting (BpS) type (aggregated to nonfuel, conifer-conifer/hardwood, hardwood, grassland, shrubland, and riparian)

LANDFIRE (Rollins 2009)

Elevation

Meters above sea level

USGS

Potential solar radiation

A proxy for aspect

Derived from elevation grid in ArcMap (ESRI Inc. 2008)

Topographic position index

Index that identifies valleys and ridges

(Weiss 2001)

Distance to trails*

Meters to nearest trail

Bridger-Teton National Forest

Distance to roads*

Meters to nearest road

Bridger-Teton National Forest

  1. * These variables were not included in the lightning model.