color filled contour map 1 - 彩色した図と等深線を重ねる（グラデーション）　
  使うコマンド　　makecpt, grdimage, grdcontour, 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
cint=500                                # contour interval
limit=-10000/-500                       # contour min/max
aint=2000                               # annotation contour interval
grdfile=JTOPO1_30.grd                   # input bathymetry grid file
#
# plot
gmt begin colfilcnt
     gmt makecpt -Chaxby -T$climit -Z
     gmt grdimage $grdfile -R$region -J$proj
     gmt grdcontour $grdfile -C$cint -A$aint -L$limit -Wthinner
     gmt colorbar -DJMR -B1000a2000
     gmt coast -Di -Ggray -Wthin,black
     gmt basemap -B$ticks -B$frame
gmt end show



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