# xarray.core.resample.DatasetResample.backfill¶

DatasetResample.backfill(tolerance=None)

Backward fill new values at up-sampled frequency.

Parameters: tolerance : optional Maximum distance between original and new labels to limit the up-sampling method. Up-sampled data with indices that satisfy the equation abs(index[indexer] - target) <= tolerance are filled by new values. Data with indices that are outside the given tolerance are filled with NaN s