[GRASS-user] Filtering high "outliers" in Landsat reflectance imagery?

[Markus Neteler]

On Wed, Feb 20, 2013 at 3:35 PM, Nikos Alexandris
<nik at nikosalexandris.net> wrote:
> On Wednesday 20 of February 2013 13:54:11 Nikos Alexandris wrote:
>> Advanced users,
>>
>> may I seek for some recommendation on filtering Landsat reflectance
>> outliers?
>
> (Thanks Yann)
>
> Reflectance is a unit-less ratio, ranging from 0 to 1.0.  So I can flatten
> everything >1.0 to 1.0.

I would run r.neighbors with a 3x3 or 5x5 moving window and averaging
or likewise. The question is always: are they outliers or data?

Markus