Newcomb, Doug wrote >>* I have 81 points that I buffer by 25m. I then run the random points in *>>* layer bounds tool to generate 100 points. I get 43 and a message that not *>>* all points were created. *>>* I ask for 300 points, and I get 160 . * >The algorithm tries to randomly place each point for up to 200 attempts. So, >more points to be created, more attempts.
>Obviously, did you specify the same minimum distance value in both your test >for 100 and 300 points? >The chance to place the whole number of requested points depends on the >geometric characteristics of the polygons ad how are distributed in the >space and the constraint of the minimum distance between each point. If this >value is too large (e.g. in your case, > 50 m) then the problem may have no >solution. >By the way, it seems to me that the description of the algorithm in the user >manual is not accurate and should be improved. >It states that the tool creates random points within the _extent_ of a given >layer, but it is not so. >Regards. >Andrea Andrea, Thank you. Double checking the minimum distance got me on the right track. One thing to note. I used the buffer layer to clip a soil polygon layer that was multipart. The clipped layer needed to be converted to single part to place a single point in each polygon derived from the buffered layer clip. Are there any plans to make the number of tries to be a user accessible variable in the GUI? Doug -- Doug Newcomb - Cartographer USFWS 551F Pylon Dr Raleigh, NC 919-856-4520 ext. 14 [email protected] --------------------------------------------------------------------------------------------------------- *NOTE: This email correspondence and any attachments to and from this sender is subject to the Freedom of Information Act (FOIA) and may be disclosed to third parties.*
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