[GRASS-user] r.tile behaviour

[Veronica Andreo]

Hi Sajid,

I have never used r.tile before, but checking the code [1], it multiplies
the overlap by 2, so there's why. Now guesstimating, if I set an overlap of
50, I would expect to have that overlap on both sides of the desired size
of the tiles, so maybe that's why it is doubled ?

HTH,
Vero

[1]
https://trac.osgeo.org/grass/browser/grass/trunk/raster/r.tile/main.c#L101

El mié., 7 nov. 2018 a las 15:08, Sajid Pareeth (<spareeth at gmail.com>)
escribió:

> Hi all
>
> The r.tile module don't have overwrite flag, so if we re run the module
> with different parameters but with same output prefix name, then it will
> rewrite output with out warning.
> Is this intentional?
>
> Another point is, if I use overlap option it adds double the overlap cells
> to the output maps.
>
> For example in the NC location:
>
>> r.info elevation -g
>>
> rows=1350
> cols=1500
>
> r.tile input=elevation output=elev_tile width=750 height=675
>> r.info elev_tile-001-001 -g
>>
> rows=675
> cols=750
>
> r.tile input=elevation output=elev_tile width=750 height=675 overlap=50
>> r.info elev_tile-001-001 -g
>
> rows=775 (+ 100)
> cols=850 (+ 100)
>
> In the last case the rows and cols should be 725 and 800 respectively, as
> it should add 50 cells as overlap to each tile? Or am I missing something?
>
> Regards
>
> Sajid
>
>
>
>
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