use `crs_wkt` instead of deprecated `spatial_ref`

openradar / xradar

A tool to work in weather radar data in xarray

https://docs.openradarscience.org/projects/xradar

MIT License

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use `crs_wkt` instead of deprecated `spatial_ref` #127

Closed kmuehlbauer closed 1 year ago

kmuehlbauer commented 1 year ago

This forces writing of crs_wkt instead of deprecated spatial_ref. On reading crs_wkt takes precedence over spatial_ref (for backwards compatibility).

[x] Tests fixed
[x] Changes are documented in history.md