hex.env {maptree}R Documentation

Environmental Variables for Oregon, USA

Description

Distributions of 10 environmental variables over 404 grid cells in Oregon, USA.

Usage

data (hex.env)

Format

A data frame with 404 rows and 10 columns.

Details

Row labels are hexagon identifiers from White et al. (1992). Variables 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, white.denis@epa.gov

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.

See Also

hex.spp, oregon