[GRASSLIST:10759] Re: draw gps co-ordinates with a varying circle around them

[C. H. Roosevelt]

Hi Michael,

On the subject of d.vect.thematic and drawing circles of varying size  
around points [perhaps not the best place to jump into this  
question], is there any way to have d.vect.thematic display points  
graduated according to exact values (e.g., diameters from an  
attribute column) rather than according to intervals, std. devs.,  
etc.? A while back Hamish wrote this option into ps.map and I find it  
extremely useful.

Chris


On Mar 6, 2006, at 9:05 AM, Michael Barton wrote:

> You can also use the thematic mapper (d.vect.thematic)
>
> Michael
> __________________________________________
> Michael Barton, Professor of Anthropology
> School of Human Evolution and Social Change
> Arizona State University
> Tempe, AZ 85287-2402
>
> phone: 480-965-6213
> fax: 480-965-7671
> www: http://www.public.asu.edu/~cmbarton
>
>
>
>> From: Hamish <hamish_nospam at yahoo.com>
>> Date: Mon, 6 Mar 2006 15:05:58 +1300
>> To: <dylan.beaudette at gmail.com>
>> Cc: <phm4 at kent.ac.uk>, <GRASSLIST at baylor.edu>
>> Subject: [GRASSLIST:10746] Re: draw gps co-ordinates with a  
>> varying circle
>> around them
>>
>>>> I hope I explain my problem properly. I have managed, with your
>>>> help, to visualise my gps data with v.neigbors, where v.neigbors
>>>> lets me specify the size of the neigborhood diameter and then  
>>>> counts
>>>> how many gps points fall within each neigborhood.
>>>> What I like to do now is to visualise gps data which has long and
>>>> lat, plus a value for the size of the neigborhood around each  
>>>> long -
>>>> lat co-ordinate, e.g.:
>>>>
>>>> 51.298895 | 1.071705 | 0.1
>>>>
>>>> I don't want grass to count the frequency of gps co-ordinates which
>>>> fall into the neigborhood, as all of them have already been
>>>> eliminated from the data. So all I want grass to do essentially is
>>>> to visualise gps co-ordinates with varying circles around them.
>>>>
>>>> Thank you for pointing me into the right direction.
>>>>
>>>> Cheers,
>>>> Phil
>>>
>>> Give d.vect.thematic a try.
>>
>> for bubble plots also try 'd.vect.chart ctype=pie' with only one data
>> column, size column.
>> or try 'v.buffer bufcol='  (sometimes buggy)
>>
>>
>>
>> Hamish
>
>

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

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