[Qgis-user] How to Identify the best subdataset of a dataset of points which follow a canonical distribution ?

2011-01-25 Thread nikos
Hello List, I have an interesting problem, and I'd really appreciate if you could give a couple insightful tips on how you'd solve the following: I want to order some meteo (rain mm/month for PSDI) data from my corresponding national agency, but in their infinitive wisdom they choose to place

Re: [Qgis-user] How to Identify the best subdataset of a dataset of points which follow a canonical distribution ?

2011-01-25 Thread Anita Graser
Hi Nikos, I think this would be a perfect question for gis.stackexchange.com A manual approach (135 stations is not that much) would be to decide on a maximum distance between stations (depends on your analysis requirements I guess) and then buffer the station points accordingly. You can then

Re: [Qgis-user] How to Identify the best subdataset of a dataset of points which follow a canonical distribution ?

2011-01-25 Thread Albin Blaschka
Hello, another idea, unfortunately no solution, would be to ask at the r-sig-geo Mailinglist[1] - a list on the statistic-package R, which can be used directly in QGIS via the ManageR-Plugin...if you know a little bit of statistics and R... but could also be a little bit of overdoing if you

Re: [Qgis-user] How to Identify the best subdataset of a dataset of points which follow a canonical distribution ?

2011-01-25 Thread Lionel Roubeyrie
Hello, in first approch you can compute the general mean of your observations and select only stations with rain mesureaments failing inside a determinated tolerance around that mean. Another common use would be to randomly remove some stations and look at the resulting variance against the

Re: [Qgis-user] How to Identify the best subdataset of a dataset of points which follow a canonical distribution ?

2011-01-25 Thread Anita Graser
Hi Lionel, Those are good approaches. I think the problem is that Nikos doesn't have any measurement data yet (because he has to pay for every single station). So in this case, I don't think these methods can be used. Best wishes, Anita On Tue, Jan 25, 2011 at 2:39 PM, Lionel Roubeyrie

Re: [Qgis-user] How to Identify the best subdataset of a dataset of points which follow a canonical distribution ?

2011-01-25 Thread Lionel Roubeyrie
Sorry for the mistake, I didn't read carrefully. Without observations, it will be hard to extract some relevant informations on just geographical situations (distances matrix?), unless you can work with others datas (wind speeds and directions, ...) and correlate them with rainfalls. 2011/1/25