grd_tile: Extract normalized grid tiles

In paleolimbot/grd: Raster and Grid Geometry

Description

Extract normalized grid tiles

Usage

grd_tile(grid, level, i, j = NULL, ..., ptype = grd_data_ptype(grd_data(grid)))

## S3 method for class 'grd_rct'
grd_tile(grid, level, i, j = NULL, ..., ptype = grd_data_ptype(grd_data(grid)))

Arguments

grid	A grd_xy(), grd_rct(), or other object implementing grd_*() methods.
level	An integer describing the overview level. This is related to the step value by a power of 2 (i.e., a level of 1 indicates a step of 2, a level of 2 indicates a step of 4, etc.).
i	1-based index values. i indices correspond to decreasing y values; j indices correspond to increasing x values. Values outside the range 1:nrow|ncol(data) will be censored to NA including 0 and negative values.
j	1-based index values. i indices correspond to decreasing y values; j indices correspond to increasing x values. Values outside the range 1:nrow|ncol(data) will be censored to NA including 0 and negative values.
...	Passed to S3 methods
ptype	The R object type that should be used to represent the data.

Value

A grd_collect()ed version

Examples

grid <- grd_rct(volcano)
plot(grd_tile(grid, 4, 1, 1))
plot(grd_tile(grid, 3, 1, 1), add = TRUE)

paleolimbot/grd documentation built on Dec. 22, 2021, 6:38 a.m.