Davids Corine wrote:
I know that it is possible to rotate symbols based on data in a column
in the attribute table in ps.map, but is this also possible in d.vect?
On the Wiki page for IconSymbols it implies that rotation of symbols
should be possible in the d.vect module from v.6.3, but I cannot
figure out how and there is nothing in the manual pages for d.vect.
hmph, the wiki page was wrong. I've just fixed that and added this as a
new wish in the trac system: http://trac.osgeo.org/grass/ticket/600
I think it would be a moderately simple feature to add.
Using the GRASS 6.4.0RC version you might try the v.out.ascii+d.graph
work-around I added to that wish-report:
#spearfish dataset
#create example values using the cat number for angle
# rotation is measured in degrees CCW from East
g.copy vect=archsites,test_rotate
v.db.addcol test_rotate column='rotation double precision'
v.db.update test_rotate column=rotation value='CAT'
v.out.ascii test_rotate column=rotation | \
awk -F'|' '{printf("rotation %s\nsymbol geology/strike_triangle 12 %s %s black black\n", $4, $1, $2)}' \
> test_rotate_graph.rules
d.graph -m test_rotate_graph.rules
d.vect test_rotate disp=cat yref=top
for GRASS 6.3 I think you have to get the v.out.ascii.db script from
wiki addons. (the 'v.out.ascii column=' option is new)
but William has 6.4.0RC Mac packages available on his website, which
is perhaps an easier/better solution to that.
(apologies if this post appears twice, I tried to post this
a few days ago already)
first copy I've seen.
good luck,
Hamish