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  • Xarray returns duplicate Longitude/Latitude values with sel method · 3 ✖

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1249353885 https://github.com/pydata/xarray/issues/7042#issuecomment-1249353885 https://api.github.com/repos/pydata/xarray/issues/7042 IC_kwDOAMm_X85Kd6Cd benbovy 4160723 2022-09-16T13:16:43Z 2022-09-16T13:16:43Z MEMBER

You'd need to adjust the latitude / longitude values passed to sel so that your ROI contains (or is nearest to) more than one gird point in latitude or longitude. I'm afraid there's not automatic way in Xarray to do that.

 
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   Xarray returns duplicate Longitude/Latitude values with sel method  1374911473
1249295769 https://github.com/pydata/xarray/issues/7042#issuecomment-1249295769 https://api.github.com/repos/pydata/xarray/issues/7042 IC_kwDOAMm_X85Kdr2Z benbovy 4160723 2022-09-16T12:19:48Z 2022-09-16T12:19:48Z MEMBER

Hi @rogomichael,

It is expected in your example that sel with your given values and method='nearest' returns coordinates with duplicate longitude & latitude values.

The resolution of the grid is too coarse compared to your ROI, which is why the two provided values for latitude (longitude) both select the same grid point.

If you want to use sel for extracting a range over the latitude and longitude dimensions, it is better to use slices. It better illustrates that your ROI is smaller than the grid resolution:

```python ds.sel( longitude=slice(49.294, 49.376), latitude=slice(10.971, 11.087) )

<xarray.Dataset>

Dimensions: (time: 365, longitude: 1, latitude: 0)

Coordinates:

* time (time) datetime64[ns] 2019-01-01 2019-01-02 ... 2019-12-31

* longitude (longitude) float64 49.38

* latitude (latitude) float64

Data variables:

tg (time, latitude, longitude) float32 ...

``` 

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   Xarray returns duplicate Longitude/Latitude values with sel method  1374911473
1248529133 https://github.com/pydata/xarray/issues/7042#issuecomment-1248529133 https://api.github.com/repos/pydata/xarray/issues/7042 IC_kwDOAMm_X85Kawrt TomNicholas 35968931 2022-09-15T19:36:46Z 2022-09-15T19:36:46Z MEMBER

Hi @rogomichael, thanks for raising your issue.

Could you possibly turn your problem into a minimal reproducible example? That would make it much easier for us to help you.

You've included a lot of code, but from looking at it it seems to me that the only lines which matter are

```python nc_file = xr.open_mfdataset('year2019.nc')

nc_file["tg"].sel( longitude=[state_lon[0], state_lon[1]], latitude=[state_lat[0], state_lat[1]], method="nearest" ) ```

This suggests to me that your original file has duplicate values, as all xarray has done here is open it.

(However I still am not going to be able to reproduce this error without access to the file year2019.nc.)

 
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   Xarray returns duplicate Longitude/Latitude values with sel method  1374911473

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