Convenience constructor: derive the transform from extent + dims (or res).

Give the pixel grid either directly as dims (nx, ny) or as res (pixel size), from which dims is derived and the extent snapped to a whole number of pixels. Exactly one of the two.

Usage

grid_spec(crs, extent, dims = NULL, dtype = "f32", res = NULL)

Arguments

crs

CRS string in any GDAL-interpretable form.

extent

Numeric length 4: xmin, ymin, xmax, ymax.

dims

Integer dimensions c(nx, ny). Provide this OR res, not both.

dtype

dtype string from the garry vocabulary.

res

Pixel resolution in the units of crs: a scalar (square pixels) or c(xres, yres). Derives dims from extent and snaps extent to a whole number of pixels (anchored at the top-left, so the resolution is exactly res). Provide this OR dims, not both.

Value

A GridSpec.

See also

grid_from_bbox() and grid_from_src(), the higher-level constructors that derive a grid from an area of interest; GridSpec(), the underlying class constructor.