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A filter function to extract a subset of its geopoints input using a second geopoints as criteria. The two input geopoints must have the same number of values. The resulting output geopoints contains the values of the first geopoints where the value of the second geopoints is non-zero. It is usefully employed in conjunction with the comparison operators :
The variable
will contain a subset of temperature where the value is below 273.15. |
Use this in combination with what you have already done to produce a geopoints variable consisting only of the points within 10km of your chosen location. Plot the result to confirm it.
Converting between geopoints and GRIB
? Needed? Already covered in the Processing Data part! XXXXXX
ASCII Table Data
Metview incorporates functionality to read, process and visualise data stored in ASCII table files, including the commonly-used CSV (comma-separated value) format.
Look at the supplied file t2_20120304_1400_1200.csv. This is a standard CSV file, with a header row at the top, followed by one row per observation, one column per field.
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Station,Lat,Lon,T2m1,71.1,28.23,271.32,70.93,-8.67,274.7. . . |