[GRASS-user] Multiple custom symbols per point based on attribute(s)

[Markus Neteler]

Hi John,

On Thu, Aug 14, 2014 at 9:49 PM, Yangos Chalazonitis <yhal at dhal.com> wrote:
> Hello,
>
> I am trying to figure out a way to display more than one icons/symbols per
> location, representing various local attributes.
>
> E.g. I have the coordinates of a village and know that it has a church, a
> theatre and a factory nearby. Another village might only have a factory. A
> third might have a theatre and a factory, but no church.

I have done something perhaps similar time ago: mapping the "payload" of
ticks (Ixodes ricinus) which could carry none, one or multiple disease
pathogens, be found or not and be analyzed in the lab or not:

box drawing:
  - no tick found in sampling site (green)
  - tick found but not analyzed in lab: grey (no data)
  - no disease found: white (true negative)
  - Ba: Babesia (red)
  - Bo: Borrelia (blue)
  - An: Anaplasma (yellow)
  - Ri: Rickettsia (purple)

  Quadrants:
   Bo|Ba   nw|ne
   --+--   --+--
   An|Ri   sw|se

  Based on disease columns:
   n= not investigated or not recorded <-- NA
   f= false  <- disease absence
   t= true   <- disease presence

A bit complex to read perhaps but yet highly compressed. Attached a map
excerpt screenshot which I created with ps.map and/or d.vect|PNG driver
(don't remember, sorry).

Then I used something like this (it is years ago but some script I found
back):

ISIZE=10
d.vect $MAP icon=extra/offbox_ne size=$ISIZE fcol=grey
d.vect $MAP icon=extra/offbox_nw size=$ISIZE fcol=grey
d.vect $MAP icon=extra/offbox_sw size=$ISIZE fcol=grey
d.vect $MAP icon=extra/offbox_se size=$ISIZE fcol=grey

#DISEASE=babesia
DISEASE=bab_fixed
d.vect $MAP where="$DISEASE = 't'" icon=extra/offbox_ne size=$ISIZE fcol=red
d.vect $MAP where="$DISEASE = 'f'" icon=extra/offbox_ne size=$ISIZE
fcol=white
d.vect $MAP where="$DISEASE = 'n'" icon=extra/offbox_ne size=$ISIZE
fcol=green
#d.vect $MAP where="$DISEASE = 't'" icon=basic/cross1

#DISEASE=borrelia
DISEASE=bor_fixed
d.vect $MAP where="$DISEASE = 't'" icon=extra/offbox_nw size=$ISIZE
fcol=blue
d.vect $MAP where="$DISEASE = 'f'" icon=extra/offbox_nw size=$ISIZE
fcol=white
d.vect $MAP where="$DISEASE = 'n'" icon=extra/offbox_nw size=$ISIZE
fcol=green
[...]

So, just take it as a hint rather than a copy-paste example.

Markus
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