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• read both files
• use the grib_get_double(fieldset, string) function twice to extract the grid resolution from uv850[1]
• use the read() command to set the grid on t2m

Extract field values at a set of locations

Extract the temperature values from the t2m_forecast.grib file at all the locations in the geopoints data returned by the filter_obs_t2m icon. Hint:

• the Macro function interpolate(field, geopoints) returns a new geopoints variable whose locations are from its input geopoints and whose values are interpolated from the input field