format
The format is:
Formal class 'SoilProfileCollection' [package "aqp"] with 6 slots
..@ idcol : chr "soil"
..@ depthcols: chr [1:2] "top" "bottom"
..@ metadata :'data.frame': 1 obs. of 1 variable:
.. ..$ depth_units: chr "cm"
..@ horizons :'data.frame': 1539 obs. of 17 variables:
.. ..$ soil : profile ID
.. ..$ sand : sand
.. ..$ silt : silt
.. ..$ clay : clay
.. ..$ R25 : RGB r-coordinate
.. ..$ G25 : RGB g-coordinate
.. ..$ B25 : RGB b-coordinate
.. ..$ pH : pH
.. ..$ EC : EC
.. ..$ CaCO3 : CaC03 content
.. ..$ C : C content
.. ..$ Ca : Ca
.. ..$ Mg : Mg
.. ..$ Na : Na
.. ..$ top : horizon top boundary
.. ..$ bottom : horizon bottom boundary
.. ..$ soil_color: soil color in r-friendly format
..@ site :'data.frame': 0 obs. of 0 variables
..@ sp :Formal class 'SpatialPoints' [package "sp"] with 3 slots
.. .. ..@ coords : num [1, 1] 0
.. .. ..@ bbox : logi [1, 1] NA
.. .. ..@ proj4string:Formal class 'CRS' [package "sp"] with 1 slots
.. .. .. .. ..@ projargs: chr NAsource
296 Soil Profiles from the La Rochelle region of France (F. Carre and Girard, 2002).