.makeGRaster

Create a <code>GRaster</code> from a raster existing in the current GRASS session.

internal

Processing of large-in-memory/large-on disk rasters and spatial
vectors using 'GRASS GIS' <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 GIS' 8.0 or higher.

Adam B. Smith

fasterRaster

Faster Raster and Spatial Vector Processing Using 'GRASS GIS'

.makeGRaster function

<dl><dt>src</dt>
<dd>Character (name of the raster in **GRASS) or a <code>rastInfo</code> object.</dd>
<dt>names</dt>
<dd>Character: Name of the raster.</dd>
<dt>levels</dt>
<dd><code>NULL</code> (default), a <code>data.frame</code>, <code>data.table</code>, an empty string (<code>""</code>), or a list of <code>data.frame</code>s, <code>data.table</code>s, and/or empty strings: These become the raster's <code><a href="/link/levels()?package=fasterRaster&version=8.4.0.5" data-mini-rdoc="fasterRaster::levels()">levels()</a></code>. If <code>""</code>, then no levels are defined.</dd>
<dt>ac</dt>
<dd>Vector of numeric/integer values &gt;=1, or <code>NULL</code> (default): Active category column (offset by 1, so 1 really means the second column, 2 means the third, etc.). A value of <code>NULL</code> uses an automated procedure to figure it out.</dd>
<dt>fail</dt>
<dd>Logical: If <code>TRUE</code> (default), and the raster either has a 0 east-west or north-south extent, then exit the function with an error. If <code>fail</code> is <code>FALSE</code>, then display a warning and return <code>NULL</code>.</dd></dl>

Arguments

Create a GRaster — .makeGRaster

<dl>

<dt>src</dt>
<dd>Character (name of the raster in **GRASS) or a <code>rastInfo</code> object.</dd>


<dt>names</dt>
<dd>Character: Name of the raster.</dd>


<dt>levels</dt>
<dd><code>NULL</code> (default), a <code>data.frame</code>, <code>data.table</code>, an empty string (<code>""</code>), or a list of <code>data.frame</code>s, <code>data.table</code>s, and/or empty strings: These become the raster's <code><a href='https://rdrr.io/r/base/levels.html'>levels()</a></code>. If <code>""</code>, then no levels are defined.</dd>


<dt>ac</dt>
<dd>Vector of numeric/integer values &gt;=1, or <code>NULL</code> (default): Active category column (offset by 1, so 1 really means the second column, 2 means the third, etc.). A value of <code>NULL</code> uses an automated procedure to figure it out.</dd>


<dt>fail</dt>
<dd>Logical: If <code>TRUE</code> (default), and the raster either has a 0 east-west or north-south extent, then exit the function with an error. If <code>fail</code> is <code>FALSE</code>, then display a warning and return <code>NULL</code>.</dd>

</dl>

.makeGRaster: Create a GRaster

Description

Usage

Value

Arguments

See Also