[GRASS-dev] r.univar -e

[Michael Barton]

Hoorah!

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics and Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton


> From: Martin Landa <landa.martin at gmail.com>
> Date: Thu, 31 Aug 2006 09:42:00 +0200
> To: grass-dev <grass-dev at grass.itc.it>
> Subject: [GRASS-dev] r.univar -e
> 
> Hi all,
> 
> I have added '-e' flag to r.univar according to r.univar.sh. See the
> attached patch. Please look at the code, any comments welcomed...
> (before committing to CVS - if desired...).
> 
> Best, Martin
> 
>   GRASS 6.3.cvs (spearfish60):~ > r.univar help
> 
> Description:
>   Calculates univariate statistics from the non-null cells of a raster map.
> 
> Keywords:
>  raster, statistics
> 
> Usage:
>   r.univar [-qge] map=name [percentile=value]
> 
> Flags:
>   -q   Quiet mode
>   -g   Print the stats in shell script style
>   -e   Calculate extended statistics (quartiles and percentile)
> 
> Parameters:
>          map   Name of input raster map
>   percentile   Percentile to calculate (requires -e flag)
>                default: 90
> 
> Just simple test:
> 
> * for DCELL:
> GRASS 6.3.cvs (spearfish60):~ > g.region rast=elevation.10m;r.univar
> elevation.10m -e
>  100%
> total null and non-null cells: 2654802
> total null cells             : 0
> 
> Of the non-null cells:
> ----------------------
> Number of cells (excluding NULL cells): 2654802
> Minimum                               : 1061.06
> Maximum                               : 1846.74
> Range                                 : 785.679
> Arithmetic mean                       : 1348.37
> Arithmetic mean of absolute values    : 1348.37
> Standard deviation                    : 175.494
> Variance                              : 30798.3
> Variation coefficient                 : 13.0153 %
> Sum                                   : 3579659211.6848597527
> 1st Quartile                          : 1196.8
> Median (even number of cells)         : 1309.37
> 3st Quartile                          : 1480.29
> 90 Percentile                         : 1613.6
> 
> * for FCELL:
> GRASS 6.3.cvs (spearfish60):~ > g.region rast=slope;r.univar slope -e
>  100%
> total null and non-null cells: 303052
> total null cells             : 12929
> 
> Of the non-null cells:
> ----------------------
> Number of cells (excluding NULL cells): 290123
> Minimum                               : 0
> Maximum                               : 52.5202
> Range                                 : 52.5202
> Arithmetic mean                       : 11.5277
> Arithmetic mean of absolute values    : 11.5277
> Standard deviation                    : 7.64516
> Variance                              : 58.4484
> Variation coefficient                 : 66.3198 %
> Sum                                   : 3344457.5523851216
> 1st Quartile                          : 5.38598
> Median (odd number of cells)          : 9.97027
> 3st Quartile                          : 16.3104
> 90 Percentile                         : 22.4337
> 
> * for CELL:
> GRASS 6.3.cvs (spearfish60):~ > g.region rast=roads;r.univar roads -e
>  100%
> total null and non-null cells: 302418
> total null cells             : 291124
> 
> Of the non-null cells:
> ----------------------
> Number of cells (excluding NULL cells): 11294
> Minimum                               : 1
> Maximum                               : 5
> Range                                 : 4
> Arithmetic mean                       : 3.8091
> Arithmetic mean of absolute values    : 3.8091
> Standard deviation                    : 1.29705
> Variance                              : 1.68235
> Variation coefficient                 : 34.0514 %
> Sum                                   : 43020
> 1st Quartile                          : 3
> Median (even number of cells)         : 4
> 3st Quartile                          : 5
> 90 Percentile                         : 5
> 
> -- 
> Martin Landa <landa.martin at gmail.com> * http://gama.fsv.cvut.cz/~landa *