To check the outliers for temperatures data, use the menu Quality Control ‣ Outliers Check for temperatures data  . It will display a tabbed widget on the left panel, allows to enter the inputs data and parameters.

The tab   Data     allows to enter the inputs data and set the parameters for the QC.




  1. Select the time step of the station data to be checked.
  2. Choose the variable to be checked between the maximum and minimum temperature.
  3. Select from the drop-down list the file containing the station data to be checked if it is already loaded, or open it from the browse button on the right.
    • If TMAX is selected in (2), this should be the file containing the maximum temperature.
    • If TMIN is selected in (2), this should be the file containing the minimum temperature.
  4. Select from the drop-down list the file containing the station data to be used to check if the minimum temperature is greater than the maximum.
    • If TMAX is selected in (2), this should be the file containing the minimum temperature.
    • If TMIN is selected in (2), this should be the file containing the maximum temperature.
  5. Click on this button to set the parameters to perform the outliers check






If the elevation data come from DEM (Digital Elevation Model), Select   Elevation from DEM    , you have to provide the DEM file in NetCDF format, select it from the drop-down list if it is already loaded or open it from the browse button . If the elevation data come from the station data select   Elevation from station data    .

  1. Type the full path to the folder to save the results of the outliers check, or use the browse button .
  2. Click the button   Check Outliers   to run the quality control.

This creates a folder named TMAX.OUTLIERS.CHECK_data or TMIN.OUTLIERS.CHECK_data under the folder you provided (6) to save the results of the outliers check. Inside this folder 2 directories and 1 file are created:
- CDTDATASET: directory containing all the required files used by CDT
- CDTSTATIONS: directory containing the checked data, when you did a correction on the suspicious values. The name of the file containing the corrected data is the same as the name of the file from the input (3).
- OutliersCheck.rds: an index file, you will need to reload the outputs of QC if you want to view the results or to continue the correction of suspicious values later.

The tab   QC Outputs     allows to view the results of the QC.




  1. If you already performed an outliers check, you do not need to run it again, you can check this box, the input field below will be activated and you can provide the full path to OutliersCheck.rds under the folder TMAX.OUTLIERS.CHECK_data or TMIN.OUTLIERS.CHECK_data by browsing it through the button on the right.
  2. The stations with suspicious values are listed here. You can select a station and click on the button       View & Edit Result       to view and edit the result of the QC for this station. You can use the buttons   <<   or   >>   to switch to the previous or next station. It will open a table on the right panel showing the output of the QC for the selected station.



After editing this table, you have to save the changes you made. You can go to the menu File ‣ Save table   or click on the button in the toolbar to save the table. If the table is saved correctly, you should see an output message “Table saved successfully”.

  1. Select here the month to display a chart of the time series for this month and the suspicious values detected from the temporal check. If you select the month from the drop-down list, click on the button   PLOT   to display the chart. You can use the buttons   <<   and   >>   to switch to the previous or next month.



  1. Select here the date corresponding to a suspicious value to plot it on a map for this date. If you select the date from the drop-down list, click on the button   PLOT   to display the map. You can use the buttons   <<   and   >>   to switch to the previous or next date.



  1. After saving the changes you made on the table, click on the button       Replace Outliers       for the changes to take effect.


To replace all the values flagged as suspicious for all stations by missing values, use the following command to the R console:

indexQC <- "/<path_to>/TMAX.OUTLIERS.CHECK_data/OutliersCheck.rds"
CDT:::QC.TT_replaceAll(indexQC, action = "all")

Change <path_to> with exact path. The corrected data are located under the folder TMAX.OUTLIERS.CHECK_data/CDTSTATIONS.

You can do the same for the minimum temperature by replacing TMAX by TMIN.


The tab   Zoom     allows to zoom the displayed map.




  1. Enter here the bounding box of the area to be displayed on the map.
  2. After setting the bounding box (1), click this button for the change to take effect.
  3. Reset the zoom.
  4. Zoom in
  5. Zoom out
  6. Draw a rectangle on the map to zoom in an area.
  7. Move the displayed map.

Right click on the map to deactivate the active zoom.


The tab   Add Layers     allows to superpose other layers.




  1. Check the box and select the shapefile from the drop-down list or open it from to add boundaries to the active map.
  2. Check the box and select the NetCDF file containing the DEM (Digital Elevation Model) from the drop-down list or open it from to add elevation data as background to the active map.
  3. Check the box and enter or browse the full path to the NetCDF data (from satellite or radar) to display. Do not forget to provide a sample file and change the filename format by clicking on the button   Settings   (see Setting NetCDF data for more details).
  4. Select the type of the map. You can choose between a pixel-based image or a contour map.