vec_write_time_cube

Each (band, time) combination becomes a stack of tiles tagged with the
chosen time stamp. Stamps are stored as int64 in the per-tile index
entry; a value of <code>0</code> is reserved for "untimed" so this writer remaps
any caller-supplied 0 to 1 internally.

A minimal columnar query engine with lazy execution on datasets
larger than RAM. Provides 'dplyr'-like verbs (filter(), select(), mutate(),
group_by(), summarise(), joins, window functions) and common aggregations
(n(), sum(), mean(), min(), max(), sd(), first(), last()) backed by a
pure C11 pull-based execution engine and a custom on-disk format ('.vtr').
Reads and writes 'GeoTIFF' (including tiled and 'BigTIFF' layouts) and a
tiled raster format ('.vec') with overview pyramids and time cubes for
larger-than-RAM raster data.

Gilles Colling

vectra

Columnar Query Engine for Larger-than-RAM Data

vec_write_time_cube function

<dl><dt>x</dt>
<dd>Numeric 4D array <code>c(rows, cols, bands, time)</code>.</dd>
<dt>times</dt>
<dd>Numeric/integer vector with <code>length(times) == dim(x)[4]</code>,
in the unit of your choice (epoch ms, year, step index).</dd>
<dt>path</dt>
<dd>Output <code>.vec</code> path.</dd>
<dt>dtype</dt>
<dd>Storage dtype (see <code>vec_write_raster</code>).</dd>
<dt>tile_size</dt>
<dd>Tile edge in pixels.</dd>
<dt>layout</dt>
<dd>Tile layout — one of <code>"image"</code> (default; one tile per
<code>(band, time, ty, tx)</code>, optimal for "give me one full image at time
T" reads) or <code>"pixel"</code> (Phase 6b; one tile per <code>(band, ty, tx)</code>
holding the full time stack as <code>[tw*th, n_time]</code>, optimal for "give
me the time series at pixel <code>(x, y)</code>" reads).</dd>
<dt>extent, gt, epsg, nodata, band_names, compression</dt>
<dd>Same semantics as
<code>vec_write_raster()</code>.</dd></dl>

Arguments

Write a 4D time-cube raster to .vec — vec_write_time_cube

<dl>

<dt>x</dt>
<dd>Numeric 4D array <code>c(rows, cols, bands, time)</code>.</dd>


<dt>times</dt>
<dd>Numeric/integer vector with <code>length(times) == dim(x)[4]</code>,
in the unit of your choice (epoch ms, year, step index).</dd>


<dt>path</dt>
<dd>Output <code>.vec</code> path.</dd>


<dt>dtype</dt>
<dd>Storage dtype (see <code>vec_write_raster</code>).</dd>


<dt>tile_size</dt>
<dd>Tile edge in pixels.</dd>


<dt>layout</dt>
<dd>Tile layout — one of <code>"image"</code> (default; one tile per
<code>(band, time, ty, tx)</code>, optimal for "give me one full image at time
T" reads) or <code>"pixel"</code> (Phase 6b; one tile per <code>(band, ty, tx)</code>
holding the full time stack as <code>[tw*th, n_time]</code>, optimal for "give
me the time series at pixel <code>(x, y)</code>" reads).</dd>


<dt>extent, gt, epsg, nodata, band_names, compression</dt>
<dd>Same semantics as
<code>vec_write_raster()</code>.</dd>

</dl>

vec_write_time_cube: Write a 4D time-cube raster to .vec

Description

Usage

Value

Arguments