[GRASS-user] Creating STRDS from scratch

[Sören Gebbert]

If your data is accumulated for a time period (a day, ...), then you
have interval time.
If your data represent a value that is valid for a specific time
period (daily mean), you have interval time.
If your data represents a specific state at a point of time that has a
smaller period as a second, then you have time instances.

The next thing to consider is, what you want to do with the data. If
you want to compute interactions with other time series, then it makes
sense to use time intervals to compute temporal overlapping and
intersection.

Best regards
Soeren

2017-02-22 0:14 GMT+01:00 Rich Shepard <rshepard at appl-ecosys.com>:
> On Tue, 21 Feb 2017, Veronica Andreo wrote:
>
>> If your maps represent intervals, then yes, it is correct to use -i. What
>> -i does is create intervals of the given increment (1 day) starting from
>> the start date that you pass (2013-11-15).
>
>
> Vero,
>
>   Since this is the first time I've dealt with temporal datasets in GRASS I
> need to understand what more experienced analysts take for granted. In this
> case I'm trying to understand whether my data do represent intervals.
>
>   The data represent the hourly average rainfall rate calculated by dividing
> the daily total rainfall amount by 24. Therefore, for each day I have a
> single value, and the STRDS input file consists of that value for each date
> in sequence for a total of 25 days. The last day in the file is a filler to
> ensure the last meaningful day is included.
>
>   So I assume that since I have raster maps for each of 25 sequential dates
> they represent intervals. And, if I were to have a set of files with each
> one on a different day, but not sequential, then those maps would not
> represent intervals. Are these assumption correct?
>
> Thanks,
>
>
> Rich
>
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