moving#

geowombat.moving(data, stat='mean', perc=50, w=3, nodata=None, weights=False)#

Applies a moving window function over Dask array blocks.

Parameters:

  • data (DataArray) – The xarray.DataArray to process.

  • stat (Optional[str]) – The statistic to compute. Choices are [‘mean’, ‘std’, ‘var’, ‘min’, ‘max’, ‘perc’].

  • perc (Optional[int]) – The percentile to return if stat = ‘perc’.

  • w (Optional[int]) – The moving window size (in pixels).

  • nodata (Optional[int or float]) – A ‘no data’ value to ignore.

  • weights (Optional[bool]) – Whether to weight values by distance from window center.

Return type:

DataArray

Returns:

xarray.DataArray

Examples

>>> import geowombat as gw
>>>
>>> # Calculate the mean within a 5x5 window
>>> with gw.open('image.tif') as src:
>>>     res = gw.moving(ds, stat='mean', w=5, nodata=32767.0)
>>>
>>> # Calculate the 90th percentile within a 15x15 window
>>> with gw.open('image.tif') as src:
>>>     res = gw.moving(stat='perc', w=15, perc=90, nodata=32767.0)
>>>     res.data.compute(num_workers=4)