issues: 349077990
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| 349077990 | MDU6SXNzdWUzNDkwNzc5OTA= | 2356 | New Resample-Syntax leading to cancellation of dimensions | 30219501 | closed | 0 | 8 | 2018-08-09T10:56:29Z | 2019-10-15T15:01:33Z | 2019-10-15T15:01:33Z | NONE | ExampleStarting with the dataset located here: https://swiftbrowser.dkrz.de/public/dkrz_c0725fe8741c474b97f291aac57f268f/GregorMoeller/, I want to calculate monthly sums of precipitation for each gridpoint in the daily data: ``` In [39]: data = array.open_dataset("eObs_gridded_0.22deg_rot_v14.0.TOT_PREC.1950-2016.nc_CutParamTimeUnitCor_FinalEvalGrid") In [40]: data Out[13]: <xarray.Dataset> Dimensions: (rlat: 136, rlon: 144, time: 153) Coordinates: * rlon (rlon) float32 -22.6 -22.38 -22.16 -21.94 -21.72 -21.5 ... * rlat (rlat) float32 -12.54 -12.32 -12.1 -11.88 -11.66 -11.44 ... * time (time) datetime64[ns] 2006-05-01T12:00:00 ... Data variables: rotated_pole int32 ... TOT_PREC (time, rlat, rlon) float32 ... Attributes: CDI: Climate Data Interface version 1.8.0 (http://m... Conventions: CF-1.6 history: Thu Jun 14 12:34:59 2018: cdo -O -s -P 4 remap... CDO: Climate Data Operators version 1.8.0 (http://m... cdo_openmp_thread_number: 4 In [41]: datamonth = data["TOT_PREC"].resample(time="M").sum() In [42]: datamonth Out[42]: <xarray.DataArray 'TOT_PREC' (time: 5)> array([ 551833.25 , 465640.09375, 328445.90625, 836892.1875 , 503601.5 ], dtype=float32) Coordinates: time (time) datetime64[ns] 2006-05-31 2006-06-30 2006-07-31 ... ``` Problem descriptionThe problem is that the dimensions 'rlon' and 'rlat' and the corresponding coordinates have not survived the resample process. Only the time is present in the result. Expected OutputI expect to have the spatial dimensions still in the output of monthly sums. The surprise is, that this is the case using the old syntax: ``` In [41]: datamonth = data["TOT_PREC"].resample(dim="time",freq="M",how="sum") /usr/bin/ipython3:1: FutureWarning: .resample() has been modified to defer calculations. Instead of passing 'dim' and how="sum", instead consider using .resample(time="M").sum('time') #!/usr/bin/env python3 In [42]: datamonth Out[42]: <xarray.DataArray 'TOT_PREC' (time: 5, rlat: 136, rlon: 144)> array([[[ 0. , 0. , ..., 0. , 0. ], [ 0. , 0. , ..., 0. , 0. ], ..., [ 0. , 0. , ..., 44.900028, 41.400024], [ 0. , 0. , ..., 49.10001 , 46.5 ]]], dtype=float32) Coordinates: * time (time) datetime64[ns] 2006-05-31 2006-06-30 2006-07-31 ... * rlon (rlon) float32 -22.6 -22.38 -22.16 -21.94 -21.72 -21.5 -21.28 ... * rlat (rlat) float32 -12.54 -12.32 -12.1 -11.88 -11.66 -11.44 -11.22 ... ``` What is wrong here? And maybe I can also ask the question why the new syntax did not consider use cases with high complex scripting? I do not like to use in my programs a hardcoded dimension name, i.e. |
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completed | 13221727 | issue |