r.series.interp(1)

NAME
r.series.interp - Interpolates raster maps located (temporal or spatial) in between input raster maps at specific sampling positions.

KEYWORDS
raster, series, interpolation

SYNOPSIS
r.series.interp
r.series.interp --help
r.series.interp [input=name[,name,...]] [datapos=float[,float,...]] [infile=name] [output=name[,name,...]] [samplingpos=float[,float,...]] [outfile=name] [method=string] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

  Flags:

--overwrite
    Allow output files to overwrite existing files

--help
    Print usage summary

--verbose
    Verbose module output

--quiet
    Quiet module output

--ui
    Force launching GUI dialog

  Parameters:

input=name[,name,...]
    Name of input raster map(s)

datapos=float[,float,...]
    Data point position for each input map

infile=name
    Input file with one input raster map name and data point position per line, field separator between name and sample point is |

output=name[,name,...]
    Name for output raster map

samplingpos=float[,float,...]
    Sampling point position for each output map

outfile=name
    Input file with one output raster map name and sample point position per line, field separator between name and sample point is |

method=string
    Interpolation method, currently only linear interpolation is supported
    Options: linear
    Default: linear

DESCRIPTION
r.series.interp interpolates new raster maps located temporal or spatial in between existing raster maps. The interpolation is performed at specific sampling positions. The sampling position for each output map must be specified, as well as the data position of the input maps. The following interpolation methods are supported.

    •   linear: Linear interpolation. At least two input maps and data positions are required.

EXAMPLES
Interpolate linear three new maps at 3 sampling positions in the interval (0.0;1.0)
First prepare the input maps:

g.region s=0 n=80 w=0 e=120 b=0 t=50 res=10 res3=10 -p3
r.mapcalc expr="prec_1 = 100"
r.mapcalc expr="prec_5 = 500"

Interpolate

r.series.interp --v input=prec_1,prec_5 datapos=0.0,1.0 \
                  output=prec_2,prec_3,prec_4 samplingpos=0.25,0.5,0.75 \
                  method=linear

Interpolate using the file option. First prepare the input file:

echo "prec_2|0.25
prec_3|0.5
prec_4|0.75" >> outfile.txt

Interpolate:

r.series.interp --v input=prec_1,prec_5 datapos=0.0,1.0 file=outfile.txt method=linear

The resulting maps will have the values 200, 300 and 400.

SEE ALSO
g.region, r.series, r.series.accumulate

Hints for large raster data processing

AUTHOR
Sören Gebbert

SOURCE CODE

Available at: r.series.interp source code (history)

Accessed: Thursday Jun 04 03:30:51 2026

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