get_isric_soil_profile: Generate a synthetic APSIM soil profile from the ISRIC soil...
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get_isric_soil_profile

R Documentation

Generate a synthetic APSIM soil profile from the ISRIC soil database

Description

Retrieves soil data from the ISRIC global database and converts it to an APSIM soil_profile object

Usage

get_isric_soil_profile(
  lonlat,
  statistic = c("mean", "Q0.5"),
  soil.profile,
  find.location.name = TRUE,
  fix = FALSE,
  verbose = TRUE,
  check = TRUE,
  physical = c("default", "SR"),
  xargs = NULL
)

Arguments

`lonlat`	Longitude and latitude vector (e.g. c(-93, 42)).
`statistic`	default is the mean
`soil.profile`	a soil profile to fill in in case the default one is not appropriate
`find.location.name`	default is TRUE. Use either maps package or photon API to find Country/State. If you are running this function many times it might be better to set this to FALSE.
`fix`	whether to fix compatibility between saturation and bulk density (default is FALSE).
`verbose`	argument passed to the fix function.
`check`	whether to check the soil profile (default is TRUE)
`physical`	whether soil physical properties are obtained from the data base or through ‘SR’, Saxton and Rawls pedotransfer functions.
`xargs`	additional arguments passed to `apsimx_soil_profile` or ‘apsimx:::approx_soil_variable’ function. At the moment these are: ‘soil.bottom’, ‘method’ and ‘nlayers’.

Details

Source: https://www.isric.org/
Details: https://www.isric.org/explore/soilgrids/faq-soilgrids

Pedotransfer functions: Saxton and Rawls, 2006. Soil Water Characteristic Estimates by Texture and Organic Matter for Hydrologic Solutions. Soil Sci. Soc. Am. J. 70:1569–1578.

TODO: need to look into how this is done in APSIM NG https://github.com/APSIMInitiative/ApsimX/pull/3994/files

NOTE: Eric Zurcher provided help by sending me an R file originally written by Andrew Moore. It provides a bit of context for how some of the decisions were made for constructing the synthetic soil profiles in APSIM. (email from june 3 2021).

Variable which are directly retrieved and a simple unit conversion is performed:
* Bulk density - bdod
* Carbon - soc
* Clay - clay
* Sand - sand
* PH - phh2o
* Nitrogen - nitrogen
Variables which are optionally estimated using pedotransfer functions:
LL15, DUL, SAT, KS, AirDry
TO-DO:
What do I do with nitrogen?
Can I use CEC?
How can I have a guess at FBiom and Finert?
FBiom does not depend on any soil property at the moment, should it?

Value

it generates an object of class ‘soil_profile’.

Author(s)

Fernando E. Miguez, Eric Zurcher (CSIRO) and Andrew Moore (CSIRO)

Examples

## Not run: 
## Only run this if rest.isric.org is working
rest.isric.on <- suppressWarnings(try(readLines("http://rest.isric.org", 
n = 1, warn = FALSE), silent = TRUE))

## Get soil profile properties for a single point
if(!inherits(rest.isric.on, "try-error")){
  sp1 <- get_isric_soil_profile(lonlat = c(-93, 42), fix = TRUE, verbose = FALSE)
  ## Visualize
  plot(sp1)
  plot(sp1, property = "water")
 }

## End(Not run)

apsimx documentation built on Sept. 11, 2024, 5:42 p.m.