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2

Solved. Just go vector-> research tools -> random selection. Then go to Vector -> analysis tools -> basic stats.. This took me more than it should, but I live to learn


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I have figure out that the Dissolve tools is causing issues with improper number of generated points. Dissolve tool did not dissolve the whole shapefile as it is supposed too, but instead instead create several linear features. Here is example of the dissolved file, still having several features, but are obviously erroneous due to linear shape: Apparently, ...


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Run NEAR tool on itself and select points with near distance greater or equal to 250 km. If you are lucky to get 200 points or more, copy them to a separate feature class and use any random generator to pick 200 of them. Selected points in a picture below show points sitting at least 500 m away from any other point. If there are less than 200 points, ...


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If you have a set of point, you can random select from it based on a random number in your attribute table. This is the first step. Once you have the random number, sort your attribute table and take the 200 first points (select manually is the fastest). The probability that you have two points at less than 250 km from each others is quite small, but it ...


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You can select a subset of your data using your attribute column "population" (let's say population > 20.000.000). Then you're able to use the toolbox treatement 'random extract' (dont forget to tick selected features only) and choose the "number of selected features" option, i don't think there will be any selection limit ... That should do the job ?


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