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qdcrop.md

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The qdcrop command is used to extract a subset querydata from the given querydata. This is commonly used in production routines to reduce the work required to calculate the desired results.

See also: qdscript tutorial

Command line

The command line syntax is

qdcrop [options] inputquerydata outputquerydata

If the output filename is omitted or it is "-", the querydata will be output to the terminal.

The available options are

  • -g [width]x[height][x][y]
    The subgrid to be extracted.
    For example, using 100x200+10+20 would extract a grid
    of size 100x200 starting from grid coordinates 10,20.
  • -G lon1,lat1,lon2,lat2
    Define the minimal subgrid to be cropped by the bottom left
    and top right longitude and latitude.
  • -d [x]x[y]
    The subgrid stepsize. For example, using 2x2 would extract
    every second grid point.
  • *-P projection
    Interpolate the cropped data to a new projection. For example: -P latlon:x1,y1,x2,y2:20x20km
  • -p param1,param2,...
    The parameters to be extracted as a comma separated list
    of parameter names, for example Temperature,Precipitation1h or 4,353.
    By default all parameters are extracted.
  • -r param1,param2,...
    The parameters to be removed as a comma separated list
  • -a param1,param2,...
    The parameters to be added to the data with missing values.
  • -A param1,param2,...
    The parameters to kept with the values taken from the first time step (presumably analysis time). Useful for propagating topography etc static parameters to all time steps.
  • -l level1,level2,...
    The levels to be extracted as a comma separated list of level numbers. By default all levels are extracted.
  • -S yymmddhhmi,....
    The time stamp(s) in UTC time to be extracted.
  • -t dt1,dt2,dt
    The time interval to be extracted as offsets from the origin time. For example parameters 24,48 would extract times between +24 and +48 hours from the origin time. dt1 may be omitted, in which case it is assumed to be zero. if the last dt parameter is given, it indicates the desired time step (in local times)
  • -T dt1,dt2,dt
    Same as -t, but dt is used in UTC-time mode
  • -z yyyymmddhhmi
    The local reference time to be usead instead of origin time
  • -Z yyyymmddhhmi
    The UTC reference time to be usead instead of origin time
  • -i hour
    The hour to be extracted (local time)
  • -I hour The hour to be extracted (UTC time)
  • -w wmo1,wmo2,... The stations to extract from point data as identified by the WMO numbers of the stations
  • -m limit
    Maximum allowed percentage of missing values per timestep in output.