[R-sig-Geo] write.tgrass (spacetime) does not create init.txt

[Sören Gebbert]

Hi,
init.txt has the following content:

temporal_type=absolute
semantic_type=mean
relative_time_unit=years
number_of_maps=61
north=75.5
south=25.25
east=75.5
west=-40.5

The spatial extent is ignored while importing, but the temporal type,
semantic type (still a dummy in TGRASS) and the number of maps must be
provided. The relative time unit is mandatory if the dataset has
relative time, otherwise it can be left out.

I noticed that the reader expects always absolute time, is it possible
to support relative time as well?


Best regards
Soeren

2014-07-07 18:46 GMT+02:00 Edzer Pebesma <edzer.pebesma at uni-muenster.de>:
> Thanks for the clear report, Veronica.
>
> Soeren (Cc:), do you know where we can find a description of the
> requirements, or examples, of the init.txt file?
>
> On 07/07/2014 06:31 PM, Veronica Andreo wrote:
>> Hi list
>>
>> I'm using R to run some processing over a spatio-temporal raster dataset
>> coming from GRASS. The workflow is as follows:
>>
>> 1. Export all my images from GRASS with t.rast.export
>> 2. Import them as a raster stack in R with read.tgrass
>> 3. do the processing... which implies converting the rasterstack into a
>> matrix, transposing and running dineof
>> 4. create the rasterstack again, add the time with setZ
>> 5. export with write.tgrass (which only seems to work for RasterStack and
>> not for STFDF, i tried both ways)
>> 6. and import to grass again...
>>
>> here is where I get the error since an init.txt file with the following
>> information is needed but it's not created by write.tgrass...
>>
>> stds_type=strds
>> format=GTiff
>> temporal_type=absolute
>> semantic_type=mean
>> number_of_maps=
>> north=
>> south=
>> east=
>> west=
>>
>> There are of course some workarounds but it would be nice -and much more
>> straightforward- that the function which is intended to provide interface
>> between R and T-GRASS, already does the job itself :)
>>
>> Thanks much!
>>
>> Best,
>> Vero
>>
>>       [[alternative HTML version deleted]]
>>
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>
> --
> Edzer Pebesma
> Institute for Geoinformatics (ifgi), University of Münster
> Heisenbergstraße 2, 48149 Münster, Germany. Phone: +49 251
> 83 33081 http://ifgi.uni-muenster.de GPG key ID 0xAC227795
>