Species analysis
Statistical exploration
Classification trees
Variables
Vaux's Swift
Occurred the most disproportionately in hexagons with 683-1134 mm
of annual precipitation and relatively flat topography. In slightly
moister areas (more than 1134 mm annual precipitation), it occurred
mostly in hexagons with more than 2% Douglas-fir - w. hemlock - red
cedar forest and some public land. In slightly drier areas (359-683 mm
annual precipitation), it occurred mostly in hexagons with no mixed
conifer forest (Northeast Oregon) but with more than 2% agricultural
land. In the driest parts of its Oregon range (218-359 mm annual
precipitation), it occurred mostly in northern hexagons or where towns
and cities is present. The logistic regression analysis showed positive
or negative association with big sagebrush shrubland, stream density,
mixed conifer forest (Northeast Oregon), towns and cities, the extent of
public land, and July maximum temperature (hex. min.).
Classification trees
Hexagons: using ONHP land cover classification (accuracy score: 86.98)
Squares: using ONHP land cover classification (accuracy score: 78.53)
Hexagons: using AVHRR land cover classification (accuracy score: 87.67)
