Hi Ivan, It does indeed count consecutive days meeting a condition per week. That's what the [-1] means in the t.rast.algebra command, i.e., it is the temporal neighbourhood modifier. If you then want to get the largest weekly consecutive days meeting the condition within a month you can aggregate the "weekly_consecutive" time series with t.rast.aggregate granularity="1 month" method="maximum"
HTH, Vero El jue, 18 ago 2022 a las 14:42, Ivan Marchesini (<[email protected]>) escribió: > Hi Markus > > thank you > > Yes I saw that algorithm but, if I'm not wrong, it does not fit with my > needs. The calculation made returns the number of days, in a given > interval (here week), that meets a certain condition. Not sure they are > consecutive. As an example: if negative temperature occur in monday and > thuesday and then in friday, saturday and sunday then the code count 5 > for that week. In my opinion what we need is 3. > > I hope I was enough clear > > In any case it would be good to find a solution for this type of problem > because these type of indexes are used for climate data analysis (e.g.: > https://www.ecad.eu/download/millennium/millennium.php > https://www.climdex.org/learn/indices/ ) > > thank you > > Ivan > > > > On 17/08/22 20:04, Markus Neteler wrote: > > Hi Ivan, > > > > On Wed, Aug 17, 2022 at 9:07 AM Ivan Marchesini > > <[email protected]> wrote: > >> Dear grass user > >> > >> I have daily rainfall strds > >> > >> I would like to obtain a layer of the largest number of consecutive days > >> where rainfall >1 mm > > May this script code help? > > > https://grasswiki.osgeo.org/wiki/Temporal_data_processing#How_to_count_consecutive_days_that_meet_a_certain_condition > ? > > > > Markus > > > >> Do you have any suggestions on how to calculate this climate index using > >> grass's time modules? > >> > >> thank you very much > >> > >> Ivan > _______________________________________________ > grass-user mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/grass-user >
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