[GRASS-user] Alternative to r.median for GRASS 7.x?

[Anna Petrášová]

r.stats.quantile should work:

https://grass.osgeo.org/grass72/manuals/r.stats.quantile.html

On Jan 26, 2018 4:44 PM, "Stefan Blumentrath" <Stefan.Blumentrath at nina.no>
wrote:

> Hi Nikos,
>
> Did you consider using r.univar (with a zones map, like v.rast.stats does:
> https://trac.osgeo.org/grass/browser/grass/branches/
> releasebranch_7_2/scripts/v.rast.stats/v.rast.stats.py#L238, just with
> colon as separator) and using the resulting table as input to r.recode (
> https://grass.osgeo.org/grass74/manuals/r.recode.html) for example?
>
> Cheers,
> Stefan
>
>
> -----Original Message-----
> From: grass-user [mailto:grass-user-bounces at lists.osgeo.org] On Behalf Of
> Nikos Alexandris
> Sent: fredag 26. januar 2018 19.52
> To: GRASS-GIS user mailing list <grass-user at lists.osgeo.org>
> Subject: [GRASS-user] Alternative to r.median for GRASS 7.x?
>
> Dear statistics experts,
>
> how can we compute the median of a floating point cover raster map, over a
> base map (using the conventional terminology as in r.stats.zonal)?
>
> It appears that there is no module to get the median out of floating point
> raster maps, using a base map as in r.stats.zonal or r.statistics (which
> does not support floating point figures).
>
> Is there an alternative to r.median for GRASS 7.x?
>
>
> A work around with r.statistics, is to use r.reclass and get the floating
> point numbers (reported via r.stats -n1) as category labels of the cover
> map. Yet, r.reclass rounds up floats before assigning a category.
>
> At the moment the shortest path seems to be v.rast.stats. This would
> require some conversions back and forth from raster to vector for the base
> map though.
>
> Thank you for any hints, Nikos
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