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This set of examples is based on file temp.bufr (click here for details).

ExampleFilterResultsComments

For all the messages: extract the first temperature value which is greater than 300 K and also extract the pressure on which it occurs


Code Block
extract_data: on
parameter_1: airTemperature
parameter_operator_1: >
parameter_value_1: 300
coordinate_condition_count: 1
coordinate_1: pressure


Image Modified

Here we explicitly say the we only want the matching temperature values which appear inside a pressure block (in these messages this is always the case). By using the coordinate condition pressure will be extracted as well because the EXTRACT_COORDINATE option is On by default.
For all the messages: extract the first temperature value which is greater than 300 K and the pressure is less than 950 hPa


Code Block
extract_data: on
parameter_1: airTemperature
parameter_operator_1: >
parameter_value_1: 300
coordinate_condition_count: 1
coordinate_1: pressure
coordinate_operator_1: >
coordinate_value_1: 95000


Image Modified

Here we further refined the coordinate condition.
For all the messages: extract the temperature value on the 500 hPa pressure level


Code Block
extract_data: on
parameter_1: airTemperature
coordinate_condition_count: 1
coordinate_1: pressure
coordinate_operator_1: =
coordinate_value_1: 50000


Image Modified


For station 78016: extract the temperature on the second pressure level



Code Block
identifier_value: 78016
extract_data: on
parameter_1: airTemperature
coordinate_condition_count: 1
coordinate_1: pressure
coordinate_rank_1: 2


Image Modified

Here we restricted the filter for one station (message) only and  used a rank condition for the coordinate.
For station 78016: extract the temperature on the first 6 pressure levels


Code Block
identifier_value: 78016
extract_data: on
parameter_1: airTemperature
coordinate_condition_count: 1
coordinate_1: pressure
coordinate_rank_1: 1/2/3/4/5/6
extract_mode: all


Image Modified

For coordinate rank a list of values can be specified.
For station 78016: extract the temperature on the 925, 850 and 700 hPa pressure levels


Code Block
identifier_value: 78016
extract_data: on
parameter_1: airTemperature
coordinate_condition_count: 1
coordinate_1: pressure
coordinate_operator_1: =
coordinate_value_1: 92500/85000/70000
extract_mode: all


Image Modified


Extract multiple parameters

This set of examples is based on file temp.bufr (click here for details).

ExampleFilterResultsComments

For all the messages: extract the first wind speed and wind direction values


Code Block
extract_data: on
parameter_1: windDirection
parameter_2: windSpeed


Image Modified


Note

The order of the parameters in extraction must match their order of appearance in the message. Otherwise the data alignment does not work properly. In our BUFR messages windDirection precedes windSpeed, so we have to use the same ordering in the filter definition.


For all the messages: extract the first wind speed and wind direction values and also extract their pressure


Code Block
extract_data: on
parameter_1: windDirection
parameter_2: windSpeed
coordinate_condition_count: 1
coordinate_1: pressure


Image Modified


For all the messages: extract wind speed and wind direction values on the 500 hPa pressure level


Code Block
extract_data: on
parameter_1: windDirection
parameter_2: windSpeed
coordinate_condition_count: 1
coordinate_1: pressure
coordinate_operator_1: =
coordinate_value_1: 50000


Image Modified


Extract with multiple (nested) coordinate conditions

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