interpIDW,GVector,GRaster-method

interpIDW

This function interpolates values from a set of points to a raster using inverse distance weighting (IDW).

Processing of large-in-memory/large-on disk rasters and spatial
vectors using 'GRASS' <https://grass.osgeo.org/>. Most functions in the
'terra' package are	recreated. Processing of medium-sized and smaller
spatial objects will nearly always be faster using 'terra' or 'sf', but
for large-in-memory/large-on-disk objects, 'fasterRaster' may be faster.
To use most of the functions, you must have the stand-alone version (not
the 'OSGeoW4' installer version) of 'GRASS' 8.0 or higher.

Adam B. Smith

fasterRaster

Faster Raster and Spatial Vector Processing Using 'GRASS'

interpIDW,GVector,GRaster-method function

<dl><dt>x</dt>
<dd>A "points" <code>GVector</code>.</dd>
<dt>y</dt>
<dd>A <code>GRaster</code> to serve as a template for interpolation: Only points in <code>x</code> that fall inside the extent of the raster will be used for interpolation. You can increase the extent of a <code>GRaster</code> using <code>extend()</code>.</dd>
<dt>field</dt>
<dd>Character, integer, or numeric integer: Name or index of the column in <code>x</code> with values to interpolate. If <code>NULL</code> and if <code>x</code> is a 3-dimensional "points" <code>GVector</code>, then the interpolation will act on the z-coordinate of each point.</dd>
<dt>nPoints</dt>
<dd>Integer or numeric integer: Number of nearest points to use for interpolation. The default is to use all points (<code>Inf</code>).</dd>
<dt>power</dt>
<dd>Numeric value &gt; 0: Power to which to take distance when interpolating. The default value is two, so the value of each point used for interpolation is \(1 / d^2\) where d is distance.</dd></dl>

Arguments

Interpolate values at points to a GRaster using inverse-distance weighting — interpIDW,GVector,GRaster-method

<dl>

<dt>x</dt>
<dd>A "points" <code>GVector</code>.</dd>


<dt>y</dt>
<dd>A <code>GRaster</code> to serve as a template for interpolation: Only points in <code>x</code> that fall inside the extent of the raster will be used for interpolation. You can increase the extent of a <code>GRaster</code> using <code>extend()</code>.</dd>


<dt>field</dt>
<dd>Character, integer, or numeric integer: Name or index of the column in <code>x</code> with values to interpolate. If <code>NULL</code> and if <code>x</code> is a 3-dimensional "points" <code>GVector</code>, then the interpolation will act on the z-coordinate of each point.</dd>


<dt>nPoints</dt>
<dd>Integer or numeric integer: Number of nearest points to use for interpolation. The default is to use all points (<code>Inf</code>).</dd>


<dt>power</dt>
<dd>Numeric value &gt; 0: Power to which to take distance when interpolating. The default value is two, so the value of each point used for interpolation is \(1 / d^2\) where d is distance.</dd>

</dl>

interpIDW,GVector,GRaster-method: Interpolate values at points to a GRaster using inverse-distance weighting

Description

Usage

Value

Arguments

See Also