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. 2022 Apr 18;88(9):e00018-22. doi: 10.1128/aem.00018-22

TABLE 2.

Variables used in logistic regression with spatial random effects, with variable description and sources given

Variable Description Source
Soil_expansive_ability Linear extensibility percent (LEP): change in soil vol upon wetting and drying Hawai'i Soil Atlas, College of Tropical Agriculture and Human Resources, University of Hawai'i at Manoa
Distance_thermal_spring Distance (m) to locations of thermal springs identified by Geothermex, Inc., in 2000 Hawai'i Department of Business, Economic Development and Tourism
Distance_to_ag Distance (m) to edge of crop polygons identified from 2020 agricultural land use update for state of Hawai'i The University of Hawai'i at Hilo Spatial Data Analysis and Visualization (SDAV) Laboratory in conjunction with the Hawai'i State Department of Agriculture, 2021
Distance_to_coast Distance (m) to coast National Hydrography Dataset (72)
Distance_inland_water Distance (m) to bodies of freshwater (rivers, streams, lakes, ponds) National Hydrography Dataset (72)
Pop_density Population density estimate (people per square km) extrapolated to 2015 based on the 2010 census at 30 arc-second resolution aggregrated at 2.5 arc-minutes Gridded Population of the World, version 4 (GPWv4) (73)
Vegetation_ht Vegetation ht (m) at 30-m resolution Climate of Hawai'i, Geography Deptartment, University of Manoa (17)
Water_balance Mathematical difference of mean annual rainfall (mm) and evapotranspiration, 30-m resolution Climate of Hawai'i, Geography Department, University of Manoa (17)
Elevation_DEM_m Elevation (m) at 10-m resolution USGS digital elevation model (74)
Soil_age_midpoint The midpoint of the soil age range USGS geologic map of Hawai’i (37)
Soil_expansive_ability × Water_balance A multiplicative interaction term between Soil_expansive ability and Water_balance