Diana User Guide: Observations  |  Previous: Fields  |  Next: Satellite and radar images |  Index

Observations Observations

Observation dialogue 1
  • On the top line plot type is selected.
  • The next lines contain data types. Multiple types can be selected.
  • Then select the parameters which are to be plotted.
  • Show all positions - displays an x where there is no room to display the observation. By clicking the x, the observation is displayed. PageUp and PageDown are used to draw the observations which there are no room for in the first picture.
  • Temp. as integers - shows the temperature, max/min temperature, dew point and sea temperature as integers (no decimals).
  • All observations (mixing different times)- displays all observations within the given time interval. This only applies to synoptic data, non-synoptic data are always displayed. The observations are sorted so that the ones which fit best time-wise are displayed first.
  • PPPP - MSLP-field - during editing shows the difference between observed pressure and the MSLP-field in the observation point. For synop plots the difference is shown instead of the observed pressure.
  • Positions only - chosen marker is shown in all observation points.
  • Criteria - chosen criteria are used. Parameters which have critera are marked with a different colour. Click "More >>" to edit the criteria.
Observation dialogue 2
  • For the plot type "Pressure", pressure level needs to be selected. Either a particular level or the same as the field. (In practice the first field displayed.)
  • Density - how close the observations are displayed.
  • Size - size of the observations.
  • Timediff - maximum allowed deviation between chosen time and observation time. For synoptic data the file valid at the selected time is used, while for non-synoptic data all files with data within the selected time interval are read. The files validity time is set in the setup-file.
  • A priority list contains the name of preferred stations. The first station in the list is displayed first, thereafter as many as there is room for. Stations not in the list are also displayed if there are room. Priority lists are defined in the setup file.
  • Show only prioritized - If checked; show only the stations contained in the chosen priority list.
  • Update - the list of files is reread.
  • Show all - Displays all plot types with the selected data types if clicked. When not clicked, only the selected plot types are plotted.
  • The red synop - button on the Status line updates the displayed observations if the relevant data files have changed since last read.

Criteria

Criteria can be given for what stations to show, depending on the value of individual parameters. The parameters or the observation can be given a colour, depending on value.

Obs criterias List of data types, data files etc. are in the OBSERVATION_FILES section in the setup file. Predefined criterias are found in the OBSERVATION_CRITERIA section. List of plot settings for observations for use in quick menues or in batch is found in the batch-section.
 Diana User Guide: Observations  |  Previous: Fields  |  Next: Satellite and radar images |  Index