[GRASS-user] Aspect direction in r.slope.aspect

[Moskovitz, Bob]

Sounds like a great idea!  If sometrhing like this can be done, we would have one less reason to shy away from FOSS.

> 
> For my 2 cents worth, it seems to make a lot more sense for a  
> *geographic* information system for all output to follow the same  
> spatial organizational standards. I understand the history of 
> the east  
> is 0 convention for parts of GRASS. And I also appreciate the  
> importance of not breaking code-dependent features within versions.  
> However, that does not mean that we should keep a 
> non-standard way of  
> measuring direction for select modules (like r.slope.aspect), while  
> measuring from north for others, simply because the program started  
> out that way. Version changes are a time when we can rethink and  
> standardize different modules that have evolved 
> independently. Scripts  
> are likely to break across the 6/7 transition for other 
> reasons anyway.
> 
> That said, a functionally simple approach that would not be quite so  
> disruptive would be to add a flag to switch to count from east mode  
> (with count from north as the default) or even a flag to switch to  
> count from north mode (with count from east being the default if  
> backward compatibility is indeed very important in this case).
> 
> It is important to get an idea of how many things actually 
> would need  
> to be changed.
> 
> Michael
> 
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