1r.resamp.stats(1)           GRASS GIS User's Manual          r.resamp.stats(1)
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NAME

6       r.resamp.stats   -  Resamples raster map layers to a coarser grid using
7       aggregation.
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KEYWORDS

10       raster, resample, univariate statistics, aggregation
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SYNOPSIS

13       r.resamp.stats
14       r.resamp.stats --help
15       r.resamp.stats [-nw] input=name output=name   [method=string]    [quan‐
16       tile=float]   [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]
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18   Flags:
19       -n
20           Propagate NULLs
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22       -w
23           Weight according to area (slower)
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25       --overwrite
26           Allow output files to overwrite existing files
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28       --help
29           Print usage summary
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31       --verbose
32           Verbose module output
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34       --quiet
35           Quiet module output
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37       --ui
38           Force launching GUI dialog
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40   Parameters:
41       input=name [required]
42           Name of input raster map
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44       output=name [required]
45           Name for output raster map
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47       method=string
48           Aggregation method
49           Options:  average,  median,  mode, minimum, maximum, range, quart1,
50           quart3, perc90, sum, variance, stddev, quantile, count, diversity
51           Default: average
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53       quantile=float
54           Quantile to calculate for method=quantile
55           Options: 0.0-1.0
56           Default: 0.5
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DESCRIPTION

59       r.resamp.stats fills a grid cell (raster) matrix with aggregated values
60       generated from a set of input layer data points.
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62       Without  the -w switch, the aggregate is computed over all of the input
63       cells whose centers lie within the output cell.
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65       With the -w switch, the aggregate uses the values from all input  cells
66       which  intersect  the output cell, weighted according to the proportion
67       of the source cell which lies inside the output cell. This  is  slower,
68       but produces a more accurate result.
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NOTES

71       Resampling  modules (r.resample, r.resamp.stats, r.resamp.interp, r.re‐
72       samp.rst) resample the map to match the current region settings.
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74       The notion of weighting doesn’t make any sense for the min and max  ag‐
75       gregates.  However,  the  -w  flag still has significance in that, when
76       multiple destination cells overlap a source cell, the  source  cell  is
77       included in the calculation of all of the destination cells.
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EXAMPLE

80       Resample  elevation  raster  map to a lower resolution (from 6m to 20m;
81       North Carolina sample dataset):
82       g.region raster=el_D782_6m -p
83       g.region res=20 -ap
84       # from 6m to 20m: weighted resampling -w
85       r.resamp.stats -w input=el_D782_6m output=el_D782_20m
86       Resampling of 6m DEM (left) to 20m DEM (right) with weighted resampling
87       (subset)
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SEE ALSO

90         g.region, r.resample, r.resamp.rst, r.resamp.filter, r.resamp.interp,
91       r.neighbors
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93       Overview: Interpolation and Resampling in GRASS GIS
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95       Examples how statistical functions are applied  can  be  found  in  the
96       r.neighbors module documentation.
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AUTHOR

99       Glynn Clements
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SOURCE CODE

102       Available at: r.resamp.stats source code (history)
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104       Accessed: Saturday Jan 21 20:38:58 2023
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106       Main  index  | Raster index | Topics index | Keywords index | Graphical
107       index | Full index
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109       © 2003-2023 GRASS Development Team, GRASS GIS 8.2.1 Reference Manual
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113GRASS 8.2.1                                                  r.resamp.stats(1)