[GRASS-dev] barscale in latlong region

[Wolf Bergenheim]

I wonder... how hard would it be to make the barscale be the
"national-geographic-like" when dealing with lat-long locations?
Is this too much work /  to hard to do? I think it could give an
additional edge to GRASS.

--Wolf

On 03.07.2007 18:51, Michael Barton wrote:
> Oh well. Guess I wasn't thinking big enough.
> 
> Michael
> 
> 
> On 7/3/07 3:54 AM, "Hamish" <hamish_nospam at yahoo.com> wrote:
> 
>> Michael Barton wrote:
>>> How about making d.barscale be approximately accurate in latlon near
>>> the bottom of the map and say so in the docs? Not ideal, but useable
>>> perhaps.
>>
>> In short, no.
>>
>> e.g. whole world etopo2/nasa blue marble/admin98:
>>  g.region n=90 s=-90 w=-180 e=180
>>
>> horizontal scale at the bottom of the map (s pole) is a singularity.
>> even if you use the center of the region (equator) it is badly wrong
>> over most of the map. I though about testing to see if the region was
>> small enough for the scale not to change much (>1-2 pixel) over the
>> spread of the map, but then it is still a different scale in the x and y
>> dirs unless you are on the equator.
>>
>>
>> Hamish
> 
> __________________________________________
> Michael Barton, Professor of Anthropology
> Director of Graduate Studies
> School of Human Evolution & Social Change
> Center for Social Dynamics & Complexity
> Arizona State University
> 
> phone: 480-965-6213
> fax: 480-965-7671
> www: http://www.public.asu.edu/~cmbarton
> 
> 
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-- 

<:3 )---- Wolf Bergenheim ----( 8:>