[GRASS-user] largest number of consecutive days where rainfall >1 mm

[Ivan Marchesini]

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
> <ivan.marchesini at gmail.com> 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