Distributions of 10 environmental variables for 389 grid
cells in Oregon, USA.
Usage
data (oregon.env.vars)
Format
A data frame with 389 rows and 10 columns.
Details
Row names are hexagon identifiers from White et al. (1992).
Variables (columns) are
bird.spp
number of native breeding bird species
x
x coordinate of center of grid cell
y
y coordinate of center of grid cell
jan.temp
mean minimum January temperature (C)
jul.temp
mean maximum July temperature (C)
rng.temp
mean difference between July and January temperatures (C)
ann.ppt
mean annual precipitation (mm)
min.elev
minimum elevation (m)
rng.elev
range of elevation (m)
max.slope
maximum slope (percent)
Source
Denis White
References
White, D., Preston, E.M., Freemark, K.E., Kiester, A.R. (1999)
A hierarchical framework for conserving biodiversity,
Landscape ecological analysis: issues and applications,
Klopatek, J.M., Gardner, R.H., editors, Springer-Verlag, pp.
127-153.
White, D., Kimerling, A.J., Overton, W.S. (1992) Cartographic
and geometric components of a global sampling design for
environmental monitoring, Cartography and Geographic
Information Systems, 19(1), 5-22.