extract_variables: Landscape variables

In medfateland: Mediterranean Landscape Simulation

Landscape variables

Description

Extract or estimate variables from landscape objects (class 'sf').

Usage

extract_variables(x, vars = "land_cover_type", SpParams = NULL, ...)

plot_variable(x, variable = "land_cover_type", SpParams = NULL, r = NULL, ...)

Arguments

x	An object of class sf with the appropriate columns.
vars	A string vector with the name of the variables to extract (see details).
SpParams	A data frame with species parameters (see SpParamsMED), required for most forest stand variables.
...	Additional arguments (not used).
variable	A string with the name of the variables to draw (see details).
r	An object of class SpatRaster, defining the raster topology.

Details

The following string values are available for vars.

Topography:

• "elevation": Elevation in m.

• "slope": Slope in degrees.

• "aspect": Slope in degrees.

• "land_cover_type": Land cover type.

Soil:

• "soil_vol_extract": Total water extractable volume (mm).

• "soil_vol_sat": Total water volume at saturation (mm).

• "soil_vol_fc": Total water volume at field capacity (mm).

• "soil_vol_wp": Total water volume at wilting point (mm).

• "soil_vol_curr": Current total water volume (mm).

• "soil_rwc_curr": Current soil relative water content (%).

• "soil_rew_curr": Current soil relative extractable water (%).

• "soil_theta_curr": Current soil moisture content (% vol.)

• "soil_psi_curr": Current soil water potential (MPa).

Watershed:

• "depth_to_bedrock": Depth to bedrock (m).

• "bedrock_porosity": Bedrock porosity.

• "bedrock_conductivity": Bedrock conductivity (m/day).

• "aquifer_elevation": Aquifer elevation over bedrock (m).

• "depth_to_aquifer": Depth to aquifer (m).

• "aquifer": Aquifer volume (mm).

• "snowpack": Snowpack water equivalent (mm).

Forest stand:

• "basal_area": Basal area (m2/ha).

• "tree_density": Tree density (ind/ha).

• "mean_tree_height": Mean tree height (cm).

• "dominant_tree_height": Dominant tree height (cm).

• "dominant_tree_diameter": Dominant tree diameter (cm).

• "quadratic_mean_tree_diameter": Quadratic mean tree diameter (cm).

• "hart_becking_index": Hart-Becking index.

• "leaf_area_index": Leaf area index (m2/m2).

• "foliar_biomass": Foliar biomass (kg/m2).

• "fuel_loading": Fine live fuel loading (kg/m2).

• "shrub_volume": Shrub volume (m3/m2).

Value

Function extract_variables() returns an object of class sf with the desired variables. Function plot_variables() returns a ggplot object.

Author(s)

Miquel De Cáceres Ainsa, CREAF.

See Also

forest, soil, summary.forest, shinyplot_land

Examples

# Load data and species parameters from medfate
data(example_ifn)
data(SpParamsMED)
  
# Calculate basal area and leaf area index
# for all forest stands
extract_variables(example_ifn, vars = c("basal_area", "leaf_area_index"),
                  SpParams = SpParamsMED)
                  

medfateland documentation built on June 8, 2025, 11:13 a.m.