[R-sig-Geo] stplot: choosing constant time interval between plots

[Edzer Pebesma]

Mathieu,

you may want to look into cut methods for Date, e.g. in your example:

xyplot(y_sref~x_sref|cut(time,4), as.data.frame(ciotat.t))



On 08/29/2011 10:31 AM, Mathieu Rajerison wrote:
> Ok,
> 
> May I ask you another question?
> 
> When I use parameter number for stplot, how does it decide to split plots by
> number?
> 
> The orange mark on the top of each plot shows me that it isn't by equal time
> intervals. I guess it is by equal object count?
> 
> Is there a way to indicate time periods on top of each plot?
> 
> Thanks
> 
> 
> 2011/8/26 Edzer Pebesma <edzer.pebesma at uni-muenster.de>
> 
>> Mathieu,
>>
>> as stplot for STIDF's is still pretty "bare", or simple, you might as
>> well work directly with xyplot from lattice. Having your data, it turns
>> out you only have a limited number of dates, the following seems to work:
>>
>> library(lattice)
>> xyplot(y_sref~x_sref|time,  as.data.frame(ciotat.t),
>>   scales=list(draw=F), asp="iso", xlab=NULL, ylab=NULL,
>>   panel = function(x,y,...) {
>>      sp.lines(contour);
>>      panel.xyplot(x,y,...)
>>   }
>> )
>>
>> as stplot assumes time is irregular, it uses
>>
>> xyplot(y_sref~x_sref | equal.count(time), ...
>>
>> which bins time into a small number of classes.
>>
>> Hth,
>>
>> On 08/26/2011 02:16 PM, Mathieu Rajerison wrote:
>>> Hi,
>>>
>>>
>>> I have a question about stplot.
>>>
>>> Let's say I'd like to plot via multi-panel a series of plots separated by
>> a
>>> given time interval. How can I accomplish that?
>>>
>>> Also, let's say this time interval is specified between thow given time
>>> instances, for example: every week between 14/07/11 and 28/08/11.
>>>
>>> Is there a way in stplot to perform these operations?
>>>
>>>
>>> Any help would be greatly appreciated
>>>
>>> *Again congrats for the powerful and easy-to-use spacetime package with
>>> strong documentation!*
>>>
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>>>
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>>
>> --
>> Edzer Pebesma
>> Institute for Geoinformatics (ifgi), University of Münster
>> Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
>> 8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
>> http://www.52north.org/geostatistics      e.pebesma at wwu.de
>>
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> 
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> 
> 
> 
> 
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-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de