[GRASSLIST:6730] symbols and map units

[Martin Landa]

Hi all,

I am trying to create a symbol and display it in scale corresponding 
with map units.

E.g.: a map created with ps.map (scale 1:1000), I would like to display points
radius: 0.5mm on the map -> so 0.5m. I am completely confused with BOX.

VERSION 1.0
BOX -0.5 -0.5 0.5 0.5
POLYGON
  RING
    FCOLOR 0 0 0
    ARC 0 0 0.5 360 0 C
  END
END

I have read about symbols at
	http://grass.gdf-hannover.de/twiki/bin/view/GRASS/GrassProgrammingHowto#Display_Symbols
but it didn't help me...

Based on this text:

when I use size=1 -> the radius should be 0.5 (map units??)
or for size=100 -> radius=50 ... but when I try to create map using ps.map I get wrong result
(smaller circle...).

Can anyone tell me why I am wrong??

Thanks a lot,

Martin 

--
Martin Landa <landa at gama.fsv.cvut.cz> * http://gama.fsv.cvut.cz/~landa *
CTU Prague, Faculty of Civil Engineering, Czech Republic