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then combine those numbers into proper date variables. Print the results of these function calls to check exactly what they are returning before you try to convert them into date variables. You will need to divide the time variable (t) to convert it into a fraction of a day before adding it to the date variable (d).
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The grib_get() functions are general-purpose functions to get pieces of meta-data from a GRIB field, specified by keys such as 'validityDate'. The Grib Examiner can help you find the available keys. |
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Your result shows the monthly anomalies for January 2014 compared with the previous 5 years.
Finding points with large anomalies
See if you can find the points which have anomalies over a certain threshold (e.g. 4 degrees). Create a geopoints variable with the result.
One possible way to do it:
- convert the anomaly field to geopoints (conversion to geopoints only works with one field at a time)
- use the
filter()andabs()functions to find just the absolute values greater than 4 - plot with customised Symbol Plotting icons (we could take the ones used in the Processing Data tutorial)