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Dear Grass Users,
Has anybody written a shell script (Grass 4.0) that produces a
more attractive and flexible legend than d.legend seems capable
of?For example, I have a d.e.m. that I am displaying as a
continuously graded grey-scale image (from 0m to 150m as 70 to 220 grey
intensity) and I would like, in a separate frame at the bottom or side,
to display a continuously graded legend labeled with elevations
at, say, 25m intervals.Some sort of control over the portion of
the colour table to display in the legend would be nice, and
with 151 'separate categories' I don't want d.legend to label
every one and put a little box around it.
Peter,
There is an alternative to create a such "continuous graded legend" in
stead of using d.legend.
(1) cd $LOCATION/cats to look at your category file and find out the
range of the category number (for example, 0 ~ 150};
(2) Use v.mkgrid to create a single row and 150 (maximum category num)
column grids, label the grids from the left (0) to the right (150);
(3) run v.to.rast to convert the vetor grid map to the raster format;
(4) copy the original color table (from $LOCATION/colr directory) of
your raster map to the color table of newly created raster grid map;
(5) use d.frame -c and d.frame -s to craete and select a new frame at
the bottom of your displayed raster map;
(6) Select correct region setting and d.rast to display the grid raster
as a simulated continuous graded legend.
This process takes some time in the vector process, but it will work ok.
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# # ## # # #### Wang Song (wang)
# # # # ## # # #
# # # # # # # # Center for Advanced Spatial Technologies
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## ## # # # ## # # University of Arkansas
# # # # # # #### Fayetteville, AR 72701
INTERNET: wang@cast.uark.edu Tel: (501) 575-6159
FAX: (501) 575-3846
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