[GRASS-stats] spgrass7 support for strds?

[Rainer M Krug]

Edzer Pebesma <edzer.pebesma at uni-muenster.de> writes:

> On 02/11/2015 03:42 PM, Rainer M Krug wrote:
>> Edzer Pebesma <edzer.pebesma at uni-muenster.de> writes:
>> 
>>> On 02/11/2015 02:52 PM, Rainer M Krug wrote:
>>>> Roger Bivand <Roger.Bivand at nhh.no> writes:
>>>>
>>>>> Since I'm uncertain whether the maintainer of spacetime is on this
>>>>> list, I'm CC-ing him here. It might make sense to discuss this -
>>>>> perhaps spgrass7 in the R-forge spgrass project is a logical place to
>>>>> support these functions?
>>>>
>>>> It is a brilliant idea to support spatio-temporal data in the spgrass7
>>>> framework.
>>>>
>>>> I agree that the functions should be in spgrass7 and that they should
>>>> have the same interface structure as the other read/write[RAST/VECT]
>>>> functions.
>>>>
>>>> I never used the package spacetime or spatio-temporal datasets in GRASS,
>>>> but maybe these functions could be re-used (or at least parts of it)?
>>>
>>> yes; and use the TGRASS (Cc: Soeren, the author), framework. Also,
>>> raster stacks with time z should be of interest (Cc: Robert).
>> 
>> Please forgive my ignorance - but is there actually an accepted (as
>> SpatialGridDataFrame et al are accepted) object framework for these
>> spatio-temporal datasets in R? It sounds as if there is not at the moment?
>
> When is something accepted?

Sorry - forgot to add "..." around the word accepted.

> raster and spacetime have both been on CRAN for some years, and have
> both been considered usefu`l by people independent from the
> developers. There is a SpatioTemporal task view that tries to list
> everything possibly relevant.

As I said, I haven't used the spatio-temporal data in a while, and when
I did, I used a home made approach to analyse these. So I don't know
what the status is now and which class would be the best to import the
data in *to have them in a format which can be converted to other
spatio-temporal formats used in other packages*.

Looking at "spacetime: Spatio-Temporal Data in R" [1] I aagree that the
classes are there.

Cheers (and I should have looked at the task view before),

Rainer

>
>> 
>>>
>>>>
>>>> But this should not hold back the release of spgrass7 in it's current
>>>> form.
>>>
>>> I suggest to rename this package to "grass", supporting the current
>>> grass release.
>>>
>>> Grass took 7 years to move 6 to 7; I discussed this with Markus last
>>> night, they might as well give up this crazy major version release cycle
>>> idea, with all kind of restrictions they impose on themselves.
>> 
>> This might cause confusion. And as long as GRASS has major versions, I
>> think we should stick with this naming scheme.
>
> We don't do this with rgdal, rgeos, RSAGA, RArcInfo, and so on. But many
> of these have an "r" in front. This seems obsolete as they are R
> packages, but may be helpful in sentences like "We used grass and the
> r-package rgrass for carrying out multidimensional scaling on the MODIS
> imagery ...", which, without the leading r, would have the word "grass"
> twice in it referring to different things.
>
> spgrass has sp in it for historic reasons - we thought about prefixing
> everything with sp in the early sp days. Now sp is default, and one
> could think about a better name.
>
>> 
>> Cheers,
>> 
>> Rainer
>> 
>>>
>>>>
>>>> Cheers,
>>>>
>>>> Rainer
>>>>
>>>>>
>>>>> Roger
>>>>>
>>>>>
>>>>> On Wed, 11 Feb 2015, Veronica Andreo wrote:
>>>>>
>>>>>> Hi
>>>>>>
>>>>>> Since you are discussing the new spgrass for GRASS 7 (and since GRASS 7
>>>>>> includes these great temporal modules), I was wondering if there's any
>>>>>> chance to include support for reading/writing spatio-temporal data sets.
>>>>>>
>>>>>> At present, there are two functions in spacetime package (read.tgrass and
>>>>>> write.tgrass) that allows reading and writing strds, but you need to export
>>>>>> it from GRASS first, do the R processing you need, and then, import it back
>>>>>> into GRASS. To have something a bit more straightforward would be awesome!
>>>>>>
>>>>>> I don't know how complicated this could be, that's why I dare to ask :)
>>>>>>
>>>>>> Keep the great job you are doing!!! And thanks a lot!!!
>>>>>>
>>>>>> Cheers,
>>>>>> Vero
>>>>>>
>>>>
>>>>
>>>>
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>>>>
>> 


Footnotes: 
[1]  http://cran.r-project.org/web/packages/spacetime/vignettes/jss816.pdf

-- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Stellenbosch University
South Africa

Tel :       +33 - (0)9 53 10 27 44
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email:      Rainer at krugs.de

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