wk_trans_explicit

A wk_trans implementation that replaces coordinate values
using a vector of pre-calculated coordinates. This is used to perform generic
transforms using R functions and system calls that are impossible or impractical
to implement at the C level.

Provides a minimal R and C++ API for parsing
well-known binary and well-known text representation of
geometries to and from R-native formats.
Well-known binary is compact
and fast to parse; well-known text is human-readable
and is useful for writing tests. These formats are
useful in R only if the information they contain can be
accessed in R, for which high-performance functions
are provided here.

Dewey Dunnington

Lightweight Well-Known Geometry Parsing

Edzer Pebesma

Anthony North

wk_trans_explicit function

<dl><dt>value</dt>
<dd>An <code>xy()</code>, <code>xyz()</code>, <code>xym()</code>, or <code>xyzm()</code> of coordinates
used to replace values in the input. Use <code>NA</code> to keep the existing
value.</dd>
<dt>use_z, use_m</dt>
<dd>Used to declare the output type. Use <code>TRUE</code> to
ensure the output has that dimension, <code>FALSE</code> to ensure it does not,
and <code>NA</code> to leave the dimension unchanged.</dd></dl>

Arguments

Transform using explicit coordinate values — wk_trans_explicit

<dl>

<dt>value</dt>
<dd>An <code>xy()</code>, <code>xyz()</code>, <code>xym()</code>, or <code>xyzm()</code> of coordinates
used to replace values in the input. Use <code>NA</code> to keep the existing
value.</dd>


<dt>use_z, use_m</dt>
<dd>Used to declare the output type. Use <code>TRUE</code> to
ensure the output has that dimension, <code>FALSE</code> to ensure it does not,
and <code>NA</code> to leave the dimension unchanged.</dd>

</dl>

wk_trans_explicit: Transform using explicit coordinate values

Description

Usage

Arguments

See Also

Examples