aqp (version 2.1.0)

sp5: Sample Soil Database #5

Description

296 Soil Profiles from the La Rochelle region of France (F. Carre and Girard, 2002)

Format

SoilProfileCollection object

Details

These data are c/o F. Carre ([e-mail]).

References

F. Carre, M.C. Girard. 2002. Quantitative mapping of soil types based on regression kriging of taxonomic distances with landform and land cover attributes. Geoderma. 110: 241--263.

Examples

if (FALSE) {
library(scales)
data(sp5)
par(mar=c(1,1,1,1))
# plot a random sampling of profiles
s <- sample(1:length(sp5), size=25)
plot(sp5[s, ], divide.hz=FALSE)

# plot the first 100 profiles, as 4 rows of 25, hard-coding the max depth
layout(matrix(c(1,2,3,4), ncol=1), height=c(0.25,0.25,0.25,0.25))
plot(sp5[1:25, ], max.depth=300)
plot(sp5[26:50, ], max.depth=300)
plot(sp5[51:75, ], max.depth=300)
plot(sp5[76:100, ], max.depth=300)


# 4x1 matrix of plotting areas
layout(matrix(c(1,2,3,4), ncol=1), height=c(0.25,0.25,0.25,0.25))

# plot profiles, with points added to the mid-points of randomly selected horizons
sub <- sp5[1:25, ]
plot(sub, max.depth=300) ; mtext('Set 1', 2, line=-0.5, font=2)
y.p <- profileApply(sub, function(x) {
  s <- sample(1:nrow(x), 1)
  h <- horizons(x); with(h[s,], (top+bottom)/2)
  })
points(1:25, y.p, bg='white', pch=21)

# plot profiles, with arrows pointing to profile bottoms
sub <- sp5[26:50, ]
plot(sub, max.depth=300); mtext('Set 2', 2, line=-0.5, font=2)
y.a <- profileApply(sub, function(x) max(x))
arrows(1:25, y.a-50, 1:25, y.a, len=0.1, col='white')

# plot profiles, with points connected by lines: ideally reflecting some kind of measured data
sub <- sp5[51:75, ]
plot(sub, max.depth=300); mtext('Set 3', 2, line=-0.5, font=2)
y.p <- 20*(sin(1:25) + 2*cos(1:25) + 5)
points(1:25, y.p, bg='white', pch=21)
lines(1:25, y.p, lty=2)

# plot profiles, with polygons connecting horizons with max clay content (+/-) 10 cm
sub <- sp5[76:100, ]
y.clay.max <- profileApply(sub, function(x) {
  i <- which.max(x$clay)
  h <- horizons(x)
  with(h[i, ], (top+bottom)/2)
  } )

plot(sub, max.depth=300); mtext('Set 4', 2, line=-0.5, font=2)
polygon(c(1:25, 25:1), c(y.clay.max-10, rev(y.clay.max+10)),
border='black', col=rgb(0,0,0.8, alpha=0.25))
points(1:25, y.clay.max, pch=21, bg='white')

# close plot
dev.off()


# plotting parameters
yo <- 100 # y-offset
sf <- 0.65 # scaling factor
# plot profile sketches
par(mar=c(0,0,0,0))
plot(sp5[1:25, ], max.depth=300, y.offset=yo, scaling.factor=sf)
# optionally add describe plotting area above profiles with lines
# abline(h=c(0,90,100, (300*sf)+yo), lty=2)
# simulate an environmental variable associated with profiles (elevation, etc.)
r <- vector(mode='numeric', length=25)
r[1] <- -50 ; for(i in 2:25) {r[i] <- r[i-1] + rnorm(mean=-1, sd=25, n=1)}
# rescale
r <- rescale(r, to=c(80, 0))
# illustrate gradient with points/lines/arrows
lines(1:25, r)
points(1:25, r, pch=16)
arrows(1:25, r, 1:25, 95, len=0.1)
# add scale for simulated gradient
axis(2, at=pretty(0:80), labels=rev(pretty(0:80)), line=-1, cex.axis=0.75, las=2)
# depict a secondary environmental gradient with polygons (water table depth, etc.)
polygon(c(1:25, 25:1), c((100-r)+150, rep((300*sf)+yo, times=25)),
border='black', col=rgb(0,0,0.8, alpha=0.25))

}