You try to retrieve data from the ECMWF data archive in NetCDF format but the retrieval fails with this message:
ECCODES ERROR : Wrong number of fields ECCODES ERROR : File contains 806 GRIBs, 806 left in internal description, 745 in request ECCODES ERROR : The fields are not considered distinct! ECCODES ERROR : Hint: This may be due to several fields having the same validity time. ECCODES ERROR : Try using the -T option (Do not use time of validity) |
This is known issue when downloading forecast data in NetCDF format, with multiple data values at the same validity time.
For example, for the ERA-Interim dataset there are two daily forecasts (00:00, 12:00), with 3-hourly forecast steps. So one could specify in a data retrieval script:
"date":"2016-12-01" "type":"fc" "time": "00:00/12:00", "step": "3/6/9/12/15", "format": "netcdf" |
With the above specification you get data for the following validity times:
In this example you get two data values at the same validity time 2016-12-01, 15:00. The NetCDF format does not support multiple data values at a single time, hence the creation of the output NetCDF file fails, triggering the error message.
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