color image map - 水深に応じて彩色した図をつくる 

  使うコマンド  makecpt, grdimage, colorbar, coast,  basemap



bash スクリプト例
#  plot bathymetry color fill map

# parameter setting
region=130/145/25/35                    # map region east/west/south/north
proj=M10                                # map projection and scale
ticks=a5f1g5                            # boundary tick info
frame=WSne+tcolor_fill                     # boundary frame info
climit=-8000/0/1000                  # color table min/max/interval
grdfile=JTOPO1_30.grd                   # input bathymetry grid file
cptfile=haxby_grad.cpt                  # color table
psfile=colfil.ps                  # output postscript file name
#
# making color table
gmt makecpt -Chaxby -T$climit -Z > $cptfile
#
# plot
gmt begin colfil
  gmt makecpt -Chaxby -T$climit -Z  
  gmt grdimage $grdfile -R$region -J$pr oj
  gmt colorbar -DJMR -B1000a2000
  gmt coast -Di -Ggray -Wthi n,black
  gmt basemap -B$ticks -B$frame
gmt end show


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