On 6 Aug 2009, at 23:07, Stuart Buchanan wrote:

> While the current random forest code distributes the individual  
> trees evenly across the terrain. This works well for large areas of  
> forest, but less well for more mixed terrain, where individual  
> copses/woods of trees are mixed with completely open ground.

> I've been working on a small patch to allow trees to be grouped  
> together into woods. This allows what seems to me to be a more  
> realistic grouping of trees for farmland in particular. For example,  
> the following screenshots show old and new renderings of some  
> farmland near my local airfield:
>
> http://www.nanjika.co.uk/flightgear/old.jpg
> http://www.nanjika.co.uk/flightgear/new.jpg

Looks like a definite improvement to me - for the case you highlight,  
of course. Your definition of woods as density + area + tree density  
seems very sensible to me.

> I'd be very interested in people's opinions on this, particularly as  
> it would result in a change to the distribution of trees globally.  
> I'm well aware that MixedCropPastureCover looks quite different in  
> Scotland than elsewhere.

Speaking as someone who also lives in Scotland, it works great!

;)


More seriously, this does need consideration from people who live  
elsewhere in the world.

James

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