Due to the nature of the data, the macro language provides little in the way of functions to process observations - you can only merge and/or plot them.
If you need to do more, you have to convert them to geopoints using the obsfilter() request. Additionally, the Opera Radar Filter icon han help convert BUFR DATA from the OPERA project.
observations ( observations & observations )observations merge ( observations,observations )
Merges two sets of observations.
observations obsfilter ( definition )geopoints obsfilter ( definition )
The obsfilter() function is a Metview request, i.e. corresponds to a Metview icon available from the User Interface - Observation Filter . It accepts BUFR input, filters out part of that input (optional) and returns BUFR data (default) or geopoints (if user so specifies) in one of three geopoints formats - see Geopoints.
The input is a definition containing a named list of values, corresponding to the contents of the Observation Filter editor contents. Remember you need only specify the parameters which you want to change from their default values.