Change data type of coordinates

[maawoo]

Hi there!
I couldn't find a simple answer after searching around, but maybe I'll find it here by asking you...
Is there a simple way of converting the data type of coordinates?
The x and y coordinates of my dataset are float64, which is not really necessary for precision as they're in meters and not degree, and it's kinda inconvenient for plotting. So what's the best way of converting the coordinates to int32 in this case?

[keewis]

unfortunately the canonical method (astype) indeed does not allow converting the coords. For data variables it would have been possible to specify a dict that maps names to dtypes (this is missing from the Dataset.astype documentation). To work around that, we can use assign:

In [8]: ds = xr.Dataset({"a": ("x", [1.3, 6.2])}, coords={"x": [0, 1]})
   ...: ds
Out[8]: 
<xarray.Dataset>
Dimensions:  (x: 2)
Coordinates:
  * x        (x) int64 0 1
Data variables:
    a        (x) float64 1.3 6.2

In [9]: ds.assign(x=lambda ds: ds.x.astype(float))
Out[9]: 
<xarray.Dataset>
Dimensions:  (x: 2)
Coordinates:
  * x        (x) float64 0.0 1.0
Data variables:
    a        (x) float64 1.3 6.2

I think extending astype to also handle coords would be a welcome addition, but since it currently uses apply_ufunc that might be tricky.

[maawoo]

Great, thanks for your quick answer!
A simple 'hack' like this is what I was looking for 👍🏻