[GRASS-dev] i.fusion.hpf addon: observing strong range change

[Nikos Alexandris]

* Markus Neteler <neteler at osgeo.org> [2019-10-28 12:33:44 +0100]:

>On Mon, Oct 28, 2019 at 10:46 AM Moritz Lennert
><mlennert at club.worldonline.be> wrote:
>> On 27/10/19 18:52, Markus Neteler wrote:
>> > Hi,
>> >
>> > I am using i.fusion.hpf on Worldview-2 data and see that the resulting
>> > range is completely different:
>> >
>> > # orig
>> > r.info -r wv2_17OCT08182034_M2AS_058891334010_01_P001.5
>> > min=0
>> > max=1509
>> >
>> > # HPF
>> > r.info -r wv2_17OCT08182034_M2AS_058891334010_01_P001.5.hpf
>> > min=-1045.79783524995
>> > max=3416.06793724612
>>
>> Just guessing here, but did you try the -c flag ?
>
>Now yes:
>
>i.fusion.hpf pan=$PAN msx=$(g.list raster pattern="$COLORPREFIX.?"
>sep=comma) -c --o
>
># band 8
>r.info -r wv2_17OCT08182034_M2AS_058891334010_01_P001.8
>min=0
>max=1605
>
>r.info -r wv2_17OCT08182034_M2AS_058891334010_01_P001.8.hpf
>min=-1163.98434592277
>max=3879.99538075697
>
>So, -c doesn't seem to have any effect here.

Mean values (and StdDev) don't change too much though. As I am looking
over the algorithm again, these days, I'll try to answer this in the
best possible way.

Cheers, Nikos