maning wrote:
Basically my workflow for creating paper maps is create the
main map in ps.map. Export the ps output to pdf or png in a
graphics software (scribus or illustrator). Edit all map elements
legend, anotations, etc.
What I want is to be bale to create the map purely within
grass and ps.map module.
sure, it's possible.
Several questions:
1. I need to prepare separate mapsheets of landcover data. I have a
vector layer in grass of all the boundingboxes. How can I call ps.map
to create mapsheets using the individual boundingboxes as the region
settings?
hmmm how to extract the bounding box of each category in a vector map?
I think there might be a way, but I'm not sure, maybe someone else knows.
anyway you can write a shell loop to use v.extract to pull out that
one category and then use g.region vect=extract_cat_$CAT to zoom in
on that one area. If you want a buffer around it, try like:
g.region vect=$MAP
g.region res=5000 -a
which will grow outwards until it hits a 5km round number.
while you are there save the region with 'g.region save=' with a name
derived from that box name so you can jump to it quickly later on.
something like
for CAT in `v.category master_bounding_box_map option=print` ; do
v.extract in=master_bounding_box_map out=bbox_$CAT list=$CAT
g.region -d
g.region vect=bbox_$CAT
g.region res=5000 -a
g.region res=10 # back to normal for raster map res
g.region save=bbox_$CAT
done
then
for REGION in `g.mlist region pattern=bbox_*` ; do
g.region region=$REGION
ps.map out=landcover_$REGION in=- EOF
end
EOF
ps2pdf landcover_$REGION.ps
done
2. Each mapsheet requires a different locatormap as reference. How
do I add the locatormap using a bigger region settings around
the mapped region settings?
inlays:
first for each mapsheet save a region with 'g.region save='.
then (in a loop) create a ps.map .eps file drawing the overview
map but also using the ps.map region instruction to draw a box
over the top of it. I like to use a red frame with width of 2,
but you'll have to experiment with the width as this .eps will be
much smaller on the page once it is embedded. Because it will be
so reduced you can probably set the resolution quite coarse, with
a little math you can figure out how many raster column cells equate
to 300dpi at your target width (e.g. if you want the inset to be 2
wide set the region resolution to be so columns is about 600 cells.)
once you have those just use the ps.map 'eps' instruction to place
them on the map. Use the 'rectangle' instruction to add a thicker
border if you like.
again, if you write the script like this:
for MAP in `g.mlist rast patter=*.landuse` ; do
case $MAP in
landuse23)
MAP_TITLE=Map of landuse category 23
;;
landuse24)
MAP_TITLE= ...
;;
esac
ps.map out=$MAP.ps in=- EOF
raster $MAP
eps 10% 10%
epsfile locator_$MAP.eps
scale 0.2
end
text 65 7365000 Landuse for $MAP_TITLE
end
end
EOF
then you can use shell variable replacement within the instruction file.
another way is to have a shell script write a bunch of files instead of
running ps.map directly; or just make a master instruction file then copy
it a bunch of times and tweak each individually. that last way is a pain
if you decide to change anything though, as you have to make the edit
in every copy of the file.
you can put the non changing bits in a template file and then do like:
for MAP in `g.mlist` ; do
ps.map out=test.ps in=- EOF
raster $MAP
eps ..
epsfile region.$MAP
end
`cat common_instructions.txt`
end
EOF
3. Legend symbology for different landcover categories within a single
polygon vector. As a workaround, I separate landcover categories as
separate vector layers.
you can keep them all in the same file, just repeat the vareas command
but limit by SQL query each time, and set the label for each vareas
as needed. see example here:
http://grass.osgeo.org/wiki/Psmap_fill_patterns
http://grass.osgeo.org/wiki/AreaFillPatterns
4. Tips and tricks for different annotations.
you'd have to be more specific about what you mean. many tips here:
http://grass.osgeo.org/wiki/Ps.map
http://grass.osgeo.org/wiki/IconSymbols#North_Arrows
see also ps.output in wiki addons.
5. Combine different ps.map output into one map.
see
http://grass.osgeo.org/wiki/Ps.map_scripts#Multiple_raster_images
feel free to add anything useful to those wiki pages.
Hamish
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