Time series
Time stamps
Meta-data:
Common legends for many raster maps
The general idea is to:
- Calculate the overall min/max covering all maps with "r.info -r"
- Create a full-scale color table with "r.colors rules=" on the first map
- Copy that color table to other maps in the series with "r.colors rast="
- Draw legend to color table extent with "d.legend range=min,max"
Example using Pathfinder AVHRR SST data:
MAP_PATTERN='*.s0451pfv50-sst*degC.q4'
# find overall min/max
ALL_MIN=999999
ALL_MAX=-999999
for MAP in `g.mlist rast pattern=$MAP_PATTERN` ; do
eval `r.info -r $MAP`
ALL_MAX=`echo "$max $ALL_MAX" | awk '{if ($1 > $2) print $1; else print $2}'`
ALL_MIN=`echo "$min $ALL_MIN" | awk '{if ($1 < $2) print $1; else print $2}'`
done
echo "all_min=$ALL_MIN all_max=$ALL_MAX"
ONETHIRD=`echo $ALL_MIN $ALL_MAX | awk '{print ($2 - $1)/3.0 + $1}'`
TWOTHIRD=`echo $ALL_MIN $ALL_MAX | awk '{print 2*($2 - $1)/3.0 + $1}'`
# create full-scale color table for first map
FIRST_MAP=`g.mlist rast pattern=$MAP_PATTERN | head -n 1`
r.colors $FIRST_MAP color=rules << EOF
$ALL_MIN blue
$ONETHIRD cyan
$TWOTHIRD yellow
$ALL_MAX red
EOF
# apply color table to all other maps
for MAP in `g.mlist rast pattern=$MAP_PATTERN` ; do
r.colors $MAP rast=$FIRST_MAP
done
# draw
for MAP in `g.mlist rast pattern=$MAP_PATTERN` ; do
d.rast -o $MAP
d.legend $MAP range=$ALL_MIN,$ALL_MAX
done
- For ps.map use the colortable instruction's "range" parameter.
Animation
- see the Movies wiki page
Development
- SQL database support for a raster map timeseries is discussed in the Time series development wiki page.