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NAME

KEYWORDS

SYNOPSIS

Flags:

-n

Propagate NULLs

-w

Weight according to area (slower)

--overwrite

Allow output files to overwrite existing files

--verbose

Verbose module output

--quiet

Quiet module output

Parameters:

input=name

Name of input raster map

output=name

Name for output raster map

method=string

Aggregation method

Options: average,median,mode,minimum,maximum,quart1,quart3,perc90,sum,variance,stddev,quantile

Default: average

quantile=float

Quantile to calculate for method=quantile

Options: 0.0-1.0

Default: 0.5

DESCRIPTION

r.resamp.stats fills a grid cell (raster) matrix with aggregated values generated from a set of input layer data points.

Without the -w switch, the aggregate is computed over all of the input cells whose centers lie within the output cell.

With the -w switch, the aggregate uses the values from all input cells which intersect the output cell, weighted according to the proportion of the source cell which lies inside the output cell. This is slower, but produces a more accurate result.

NOTES

Resampling modules (r.resample, r.resamp.stats, r.resamp.interp, r.resamp.rst) resample the map to match the current region settings.

The notion of weighting doesn't make any sense for the min and max aggregates. However, the -w flag still has significance in that, when multiple destination cells overlap a source cell, the source cell is included in the calculation of all of the destination cells.

EXAMPLE

Resample elevation raster map to a lower resolution (from 6m to 20m; North Carolina sample dataset):

g.region rast=el_D782_6m -p
g.region res=20 -ap
r.resamp.stats input=el_D782_6m output=el_D782_20m

SEE ALSO

AUTHOR

Last changed: $Date: 2011-11-08 03:23:06 -0800 (Tue, 08 Nov 2011) $

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