[GRASSLIST:8150] Re: vector point sizes in meters in ps.map or display?

C. H. Roosevelt chr at bu.edu
Wed Aug 31 09:49:53 EDT 2005

Belated thanks, Hamish.

Using d.vect.chart ctype=pie sizecol="sizecol" worked to display the  
data as desired (although a fudged scale was necessary because the  
meter values in the sizecol were read as pixel values??). I am not  
yet enough script-savvy to attempt your option (b), but will consider  
it in the future if ps.map is not already outfitted with this option.

Thanks again,

C. H. Roosevelt
Archaeology Department
Boston University
675 Commonwealth Avenue
Boston, MA, 02215-1406
Tel: (617) 358-1652 (direct)
Tel: (617) 353-3415 (main office)
Fax: (617) 353-6800
E-mail: chr at bu.edu

On Aug 20, 2005, at 11:08 PM, Hamish wrote:

>> I am having difficulties trying to print vector points at  
>> meaningful sizes
>> (using Lorenzo Moretti's most recent 6.1.cvs on MacOS 10.3.9).
>> I have a vector point file with points corresponding to the peaks  
>> of conical
>> mounds; mound diameters in meters are stored in the attached  
>> attribute table.
>> I have successfully used ps.map to output the points to an .eps  
>> file, but is
>> there any way to display or print the points so that their sizes  
>> correspond
>> exactly to a value in the attribute table (mound diameters)? I see  
>> that
>> d.vect.thematic can do something similar with graduated sizes or  
>> colors,
>> but what about exact values?
>> If there is no way to do this, could someone point me in the  
>> direction of the
>> presumably simple workaround of converting vector points to vector  
>> areas
>> with new area diameters derived from the attribute table?
> This is not (yet) possible in ps.map. Planned for the future.
> In the mean time you can try a couple of things to make a bubble plot:
> a) d.vect.chart ctype=pie sizecol=
>   then d.out.png ..?
> b) write a script that runs v.buffer for each point with dist=  
> based on
> the value, then v.patch (and repeat).
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