Fill nodata gaps along the time axis.

Temporal gap-filling (the verbs xarray spells ffill/bfill/ interpolate_na), implemented as scan_over() bodies:

• "ffill" carries the last valid value forward;

• "bfill" carries the next valid value backward;

• "linear" interpolates between the nearest valid neighbours (index-weighted, i.e. by slice position, not calendar spacing), falling back to ffill/bfill at the ends.

Usage

fill_gaps(x, method = c("ffill", "bfill", "linear"), over = "t")

Arguments

x

A LazyRaster with a t dim, or a LazyDataset.

method

"ffill", "bfill" or "linear".

over

Axis to fill along (only "t" is meaningful today).

Value

The filled object, same class as x.

Details

Works on a (t, y, x) LazyRaster cube or per band of a LazyDataset. All-nodata pixels stay NaN.