grd_tile_template

grd_tile_summary

A useful workflow for raster data in a memory bounded environment is to
chunk a grid into sections or tiles. These functions compute tiles
suitable for such processing. Use <code>grd_tile_summary()</code> to generate
statistics for <code>level</code> values to choose for your application.

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

grd_tile_template function

<dl><dt>grid</dt>
<dd>A <code>grd_xy()</code>, <code>grd_rct()</code>, or other object
implementing <code>grd_*()</code> methods.</dd>
<dt>level</dt>
<dd>An integer describing the overview level. This is related to
the <code>step</code> value by a power of 2 (i.e., a level of <code>1</code> indicates a step of
<code>2</code>, a level of <code>2</code> indicates a step of <code>4</code>, etc.).</dd>
<dt>levels</dt>
<dd>A vector of <code>level</code> values or <code>NULL</code> to use a sequence from
0 to the level that would result in a 1 x 1 grid.</dd></dl>

Arguments

Compute overview grid tile — grd_tile_template

<dl>

<dt>grid</dt>
<dd>A <code>grd_xy()</code>, <code>grd_rct()</code>, or other object
implementing <code>grd_*()</code> methods.</dd>


<dt>level</dt>
<dd>An integer describing the overview level. This is related to
the <code>step</code> value by a power of 2 (i.e., a level of <code>1</code> indicates a step of
<code>2</code>, a level of <code>2</code> indicates a step of <code>4</code>, etc.).</dd>


<dt>levels</dt>
<dd>A vector of <code>level</code> values or <code>NULL</code> to use a sequence from
0 to the level that would result in a 1 x 1 grid.</dd>

</dl>

grd_tile_template: Compute overview grid tile

Description

Usage

Value

Arguments

Examples