[R-sig-Geo] creating STFDF or ST objects in R

[Edzer Pebesma]

On 07/12/2015 07:08 PM, joke atuge via R-sig-Geo wrote:
> Hello,
>  I am having serious issues creating a space time object with a list of spatialpolygonsdataframes and their dates/ time. I keep getting an error about the time not changing. How can I get this done please? Here's a sample of my data:
> 
> [[1]]
> class       : SpatialPolygonsDataFrame 
> features    : 128 
> extent      : -127.44, -67.8964, 1.000039, 31.71804  (xmin, xmax, ymin,  ymax)
> coord. ref. : +proj=longlat +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0 
> variables   : 1
> names       : DDD.LFRP 
> min values  :     16.6 
> max values  :    488.5 
> 
> [[2]]
> class       : SpatialPolygonsDataFrame 
> features    : 126 
> extent      : -129.04, -67.8964, 3.759985, 31.71804  (xmin, xmax, ymin,  ymax)
> coord. ref. : +proj=longlat +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0 
> variables   : 1
> names       : DDD.LFRP 
> min values  :       14 
> max values  :    335.2
> The Time variables look like this:
> Timex
>  [1] "2008-12-01 04:00:00 GMT" "2008-12-01 06:30:00 GMT"
> 
> I have a list of 3,000 and the aim is to structure these spatialpolygons 
> dataframe in such a way that I can have monthly aggregates.
>  How do I create an STFDF or STIDF, please? I can convert to rasters and agregate but they are of varying extents and resolutions for each time.
> Kind regards,
> Ajoke
> 

Please tell the list more what your data are about, what your problem
is, what you have tried so far, and explain why that did not work.
-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi),  University of Münster,
Heisenbergstraße 2, 48149 Münster, Germany; +49 251 83 33081
Journal of Statistical Software:   http://www.jstatsoft.org/
Computers & Geosciences:   http://elsevier.com/locate/cageo/
Spatial Statistics Society http://www.spatialstatistics.info

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