[GRASS-dev] t.rast.out.xyz not exporting all cells in the computational region

[Veronica Andreo]

Ciao Lu,

Yes, of course I have NULL cells... cuac!

So, IIUC, as t.rast.out.xyz is a wraper for r.out.xyz it won't export cells
with NULL values, and from what I learnt just by trial and error, if the
time series happens to start with a NULL cell then one gets an empty
output. Hence, it's only useful for time series without gaps...

Would that be too complicated to add support to also export NULL cells with
some symbol such as "*" as other modules use??? Is this worth an
enhancement ticket?

Anyway, this should also be mentioned in t.rast.out.xyz manual. I will send
a diff later today.

Thanks a lot for the clarification

Cheers,
Vero

2016-11-29 15:12 GMT+01:00 Luca Delucchi <lucadeluge at gmail.com>:

> On 28 November 2016 at 14:53, Veronica Andreo <veroandreo at gmail.com>
> wrote:
> > Hello devs,
> >
>
> Hi Vero,
>
> > I'm using the add-on t.rast.out.xyz to export my raster time series to
> a csv
> > file. Here's my region definition:
> >
> > GRASS 7.3.svn (latlong_wgs84):~ > g.region -p
> > raster=A20133052013312.L3m_8D_CHL_chlor_a_4km_arg
> > projection: 3 (Latitude-Longitude)
> > zone:       0
> > datum:      wgs84
> > ellipsoid:  wgs84
> > north:      38S
> > south:      55S
> > west:       70W
> > east:       55W
> > nsres:      0:02:30
> > ewres:      0:02:30
> > rows:       408
> > cols:       360
> > cells:      146880
> >
> > By running t.rast.out.xyz I would expect to have a file with 146880 rows
> > (number of cells) and columns = the number of maps registered in the
> raster
> > time series plus x & y coordinates. The latter works, I get the expected
> > number of columns. However, the number of rows is much lower than
> expected.
> >
> > GRASS 7.3.svn (latlong_wgs84):~ > t.rast.out.xyz
> strds=cla_monthly_average |
> > wc -l
> >  100%
> > Space time raster dataset cla_monthly_average exported to -
> >
> > 12891 << -- less than 10% of the region!! No mask applied.
> >
> > I observe the same behaviour when I vary the region size and also, when I
> > export to a text file. Is this the expected behaviour? Am I missing
> > something?
> >
>
> Maybe yes... do you have null cells (read r.out.xyz manual ;-) )?
>
> r.univar can help you to discover the null cells ;-)
>
> >
> > Cheers,
> > Vero
> >
>
>
> --
> ciao
> Luca
>
> www.lucadelu.org
>
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