- From two series of input raster maps, calculates the joint probability function and outputs the probabilities of occurrence in the specified bins.
r.jpdf [-q] output=name input1=string[,string,...] input2=string[,string,...] bins1=string[,string,...] bins2=string[,string,...] [--overwrite] [--help] [--verbose] [--quiet] [--ui]
- Run quietly
- Allow output files to overwrite existing files
- Print usage summary
- Verbose module output
- Quiet module output
- Force launching GUI dialog
- output=name [required]
- Prefix of output raster name, will be followed by bin numbers
- input1=string[,string,...] [required]
- First set of input rasters
- input2=string[,string,...] [required]
- Second set of input rasters
- bins1=string[,string,...] [required]
- Start value, end value, and number of bins for first independent variable (from first set of inputs)
- bins2=string[,string,...] [required]
- Start value, end value, and number of bins for second independent variable (from second set of inputs)
reads two series of raster maps and calculates for each raster cell the joint probability density function of the two input series. The output is set of raster maps, each containing the probability within a range of values from the first set and a range from the second set. NULL values are ignored when calculating the JPDF.
The number of output raster maps is determined by the number of "bins" specified by the user using the parameters input1 and input2. The users gives the range and density of bins with input1=Start1,End1,Nbins1 input2=Start2,End2,Nbins2. In this case the data from the first data set will be assigned to Nbins1 intervals between Start1 and End1 and Nbins2 intervals between Start2 and End2 for the second data set. In addition, r.jpdf will calculate extra bins for values below or above the start and end values given by the user. In total, the output will consist of (Nbins1+2)×(Nbins2+2) raster maps. The naming of the output rasters is Prefix_N1_N2 where Prefix is given by the parameter output. N1 and N2 may contain leading zeros.
Rasters from the two series of input data will be compared in the order in which they appear in the two lists. If one list is longer than the other, the trailing raster maps will be ignored.
+2) raster maps are held in memory until the end of the processing. On the other hand, only one raster from each of the two series of input rasters will be held in memory.
r.series input1="`g.list pattern='temperature*' sep=,`" input2="`g.list pattern='pressure*' sep=,`"\
output=jpdf_temp_pres bins1=-20,40,10 bins2=950,1030,10
Note the g.list script also supports regular expressions for
selecting map names.
Hints for large raster data processing
Available at: r.jpdf source code (history)
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GRASS Development Team,
GRASS GIS 7.8.6dev Reference Manual