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 the NetCDF format:
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": "0/3/6/9/12", |
With the above specification you get data for the following validity times:
So in this example you get two values at validity time 2016-12-01, 12:00.
The NetCDF format (generated by MARS) only supports a single, one-dimensional time dimension, so a specific time can not have two values.
This is why trying to retrieve this data in NetCDF format results in an error.
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