raw_structvar

The variogram model to use, either "sph" (for a spherical
model) or "exp" (for an exponential model)

model

The maximum number of pairs of cells to use when computing the 
variogram

nmax

Number of distance bins to use to compute the variogram

nbins

Maximum distance to consider in the variogram. If NULL, then 
a distance equal to one third of the diagonal of the matrix is used

cutoff

Compute the structural variance on a matrix.

Tools to compute and assess significance of early-warnings signals (EWS) of ecosystem degradation on raster data sets. EWS are metrics derived from the observed spatial structure of an ecosystem -- e.g. spatial autocorrelation -- that increase before an ecosystem undergoes a non-linear transition (Genin et al. (2018) <doi:10.1111/2041-210X.13058>).

Alexandre Genin

spatialwarnings

Spatial Early Warning Signals of Ecosystem Degradation

raw_structvar function

<dl><dt>mat</dt>
<dd>A matrix</dd>
<dt>model</dt>
<dd>The variogram model to use, either "sph" (for a spherical
model) or "exp" (for an exponential model)</dd>
<dt>nmax</dt>
<dd>The maximum number of pairs of cells to use when computing the 
variogram</dd>
<dt>nbins</dt>
<dd>Number of distance bins to use to compute the variogram</dd>
<dt>cutoff</dt>
<dd>Maximum distance to consider in the variogram. If NULL, then 
a distance equal to one third of the diagonal of the matrix is used</dd></dl>

Arguments

Structural variance — raw_structvar

<dl>

<dt>mat</dt>
<dd>A matrix</dd>


<dt>model</dt>
<dd>The variogram model to use, either "sph" (for a spherical
model) or "exp" (for an exponential model)</dd>


<dt>nmax</dt>
<dd>The maximum number of pairs of cells to use when computing the 
variogram</dd>


<dt>nbins</dt>
<dd>Number of distance bins to use to compute the variogram</dd>


<dt>cutoff</dt>
<dd>Maximum distance to consider in the variogram. If NULL, then 
a distance equal to one third of the diagonal of the matrix is used</dd>

</dl>

raw_structvar: Structural variance

Description

Usage

Arguments

See Also

Examples