[GRASS-user] ps.map legend with rgbcolumn colors
lponti at infinito.it
Thu Mar 4 07:49:22 EST 2010
It definitely helped!
On 04/03/2010 03:21, Hamish wrote:
> Luigi Ponti wrote:
>> I haven't been able to find this in previous discussions
>> but it seems like a trivial yet impossible (for me) to solve
>> thing. (Running grass6.4-svn windows standalone installer
> (it needs to be explained better in the docs.)
>> I am trying to get a ps.map using an input file like the
>> I would like to print a categorical legend with the same
>> colors as the rgbcolumn, but I only get one gray color that
>> is different from the RGB_COLOR definitions:
It is global ecological zones from FAO http://www.fao.org/geonetwork/
with color scheme from http://colorbrewer2.org/ and underlying shaded
relief from globe relief http://www.ngdc.noaa.gov/mgg/topo/globe.html
(there is also 10m scale shoreline from http://www.naturalearthdata.com/).
I am impressed with ps.map results (never used before): it does look a
lot more like a printed map.
>> Any pointer?
> the vector legend is by map, not by category. Because you only used the
> vareas instruction once, you only get one entry in the vector legend.
> two alternatives:
> 1) add one vareas instruction for every vector zone, and add a
> where column_name = 'zonename'
On my system it needs to be unquoted (at least in my case, where values
were integers) -- I mean, no quotes at all.
> to each one. You might have to explicitly give the fill color, I don't
> think it is smart enough to know that the SQL query only results in 1.
Yes, it is not smart enough; I had to use fcolor option with R:G:B
triplet in vareas in place of rgbcolumn.
> Set the label to be each zonename.
> (easiest way for a few values)
Thanks: I have gone this way, for now. See link below:
One thing I am not able to do yet, is to use system fonts (e.g. Arial).
I have tried by setting absolute path but it doesn't seem to work. I am
afraid this is more of a postscript question... Is ps.map able to access
and embed GRASS fonts? (ok, tried to get GRASS in.)
> 2) take the 'v.colors -s' approach, and create a dummy raster map
> containing a category file and color table matching what's in the
> vector's DB. Then use the colortable command to display it. example:
This is a great example that I need to study a bit more.
Thanks for your help,
> (this exposes a bug in the ps.map categorical legend though! the fill
> colors get rearranged!)
> # North Carolina sample dataset
> g.copy v=soils_wake,soils_wakeL
> # assign soil type ID number to each soil of the 77 soil types
> v.db.addcol soils_wakeL col='DSL_NUM integer'
> SOIL_TYPES=`v.db.select soils_wake col=DSL_NAME | sort | uniq`
> for TYPE in $SOIL_TYPES ; do
> i=`expr $i + 1`
> echo "UPDATE soils_wakeL SET DSL_NUM=$i WHERE DSL_NAME='$TYPE';"
> ) | db.execute
> v.extract in=soils_wakeL out=soils_wakeLc type=area where="DSL_NUM > 70"
> d.vect soils_wakeLc type=area -c where="DSL_NUM > 70"
> v.colors -s map=soils_wakeLc column=DSL_NUM color=random
> d.vect soils_wakeLc type=area -a
> g.rename vcolors_23877,soils_wakeLc.legend
> #create cats file:
> v.db.select -c soils_wakeLc columns=DSL_NUM,DSL_NAME fs=":" | \
> sort | uniq | r.category soils_wakeLc.legend rules=-
> d.legend soils_wakeLc.legend
> ps.map in=test.psm out=test.ps && gv test.ps &
> # ps.map input file
> border y
> color black
> width 1
> raster elevation_shade
> vareas soils_wakeLc
> rgbcolumn GRASSRGB
> label SOIL_CODE
> lpos 1
> # where 5.5 8
> # border black
> # font arial
> # fontsize 12
> # cols 1
> # end
> where 1 8
> raster soils_wakeLc.legend
> font arial
> fontsize 12
> cols 1
> nodata Yes
> hope it helps,
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the grass-user