In the upgrade from GRASS 6.4.2 to GRASS 7, d.vect.thematic seems to
have changed significantly. This is my tool of choice for making a
legend for vector layers. For example, given a street map of lines
called streetswm, and a column dacount indicating vehicles counted on
a given segment, and with a monitor open, the simplest but still very
useful d.vect.thematic command is:
d.vect.thematic map=streetswm@PERMANENT type=line column=dacount \
themetype=graduated_colors themecalc=interval nint=8 \
colorscheme=blue-red psmap=testthem2
In 6.4.2, that outputs both the legend and a nice thematic map using
psmap syntax. Will you please advise me on the equivalent process for
GRASS 7? I have looked in the 7.0.0RC-News and in the code for
d.vect.thematic itself but for example the keyword "graduated" or
"theme" appears nowhere in either.
To be clear, I am looking for two separate features:
1. To automatically generate breaks and assign colors to them. I just
say "gimme 8 intervals in the blue-red" and I get out intelligence
like "text 14% 54% 632.339 - 752.795 " (from
testthem2\_legend.psmap).
2. To automatically generate psmap commands, especially for the legend,
reflecting the breaks and colors automatically assigned in step 1.
I really appreciate your help. I'm running GRASS GIS 7.0.0svn (r63888).
yours truly,
James P.
--
James Powell
Portland State University
Department of Physics
Applied Physics PhD Student
Home page: http://web.pdx.edu/~powellj
Office: SRTC 409B Phone: 503-725-8515
On 05/02/15 21:38, James Powell wrote:
In the upgrade from GRASS 6.4.2 to GRASS 7, d.vect.thematic seems to
have changed significantly. This is my tool of choice for making a
legend for vector layers. For example, given a street map of lines
called streetswm, and a column dacount indicating vehicles counted on
a given segment, and with a monitor open, the simplest but still very
useful d.vect.thematic command is:
d.vect.thematic map=streetswm@PERMANENT type=line column=dacount \
themetype=graduated_colors themecalc=interval nint=8 \
colorscheme=blue-red psmap=testthem2
In 6.4.2, that outputs both the legend and a nice thematic map using
psmap syntax. Will you please advise me on the equivalent process for
GRASS 7? I have looked in the 7.0.0RC-News and in the code for
d.vect.thematic itself but for example the keyword "graduated" or
"theme" appears nowhere in either.
To be clear, I am looking for two separate features:
1. To automatically generate breaks and assign colors to them. I just
say "gimme 8 intervals in the blue-red" and I get out intelligence
like "text 14% 54% 632.339 - 752.795 " (from
testthem2\_legend.psmap).
2. To automatically generate psmap commands, especially for the legend,
reflecting the breaks and colors automatically assigned in step 1.
I really appreciate your help. I'm running GRASS GIS 7.0.0svn (r63888).
You are right that the C-module version is less feature-rich in some aspects than the original script version. Please file enhancement requests against that module for the different feature you would like to see (altough discussions are ongoing on whether this module should actually continue to be developed or not, see [1]).
The old script module is still available as an addon under the name d.vect.thematic2 [2] and should be easy to install.
Moritz
[1] http://lists.osgeo.org/pipermail/grass-dev/2015-January/072918.html
[2] http://grass.osgeo.org/grass70/manuals/addons/d.vect.thematic2.html