add -p option

gmtsph-global.sh

@@ -13,14 +13,15 @@ overwrite=0
 labels=("longitude (degree)" "latitude (degree)")
 plotgrad=0
 clon=0
+polyfile='null'
 # 从命令行获取参数
-while getopts "hi:r:u:c:a:G:l:g" arg
+while getopts "hi:r:u:c:a:G:l:p:g" arg
 do
 	case $arg in
 		h)
 			printf "simple global wide data mapping using GMT script. The template accepts a grid (.nc .grid) file as input and outputs a .png and a .eps file. \
 For futher explanations, please look for GMT's manuscripts.\nAuthor: Yi Zhang (zhangyi.cugwuhan@gmail.com)\n" 
-			printf "usage: ${0##*/} -i<grid-data> [-r<xmin>/<xmax>/<ymin>/<ymax>] [-l<lon>] [-u<unit>] [-c<cpt-file>] [-a<x-label>,<y-label>] [-g] [-G<grad-data>]\n"
+			printf "usage: ${0##*/} -i<grid-data> [-r<xmin>/<xmax>/<ymin>/<ymax>] [-l<lon>] [-u<unit>] [-c<cpt-file>] [-a<x-label>,<y-label>] [-g] [-G<grad-data>] [-p<polygon-file>]\n"
 			printf "%s\t%s\n" "-i" "input grid file"
 			printf "%s\t%s\n" "-r" "data range. The template will ditect the input data range automaticly, the use of this option will overwrite the range."
 			printf "%s\t%s\n" "-l" "central longitude value of the plot, the default value is 0"
@@ -29,6 +30,7 @@ For futher explanations, please look for GMT's manuscripts.\nAuthor: Yi Zhang (z
 			printf "%s\t%s\n" "-a" "axis labels. The deafults are x (m) and y (m)."
 			printf "%s\t%s\n" "-g" "use grdgradient. The default is false."
 			printf "%s\t%s\n" "-G" "provide a different input grid data for the use of grdgradient. This should be used with the '-g' option at the same time"
+			printf "%s\t%s\n" "-p" "plot polygons via a file."
 			exit 0;;
 		i)
 			data=$OPTARG;;
@@ -47,6 +49,8 @@ For futher explanations, please look for GMT's manuscripts.\nAuthor: Yi Zhang (z
 			plotgrad=1;;
 		G)
 			gridData=$OPTARG;;
+		p)
+			polyfile=$OPTARG;;
 		?)
 			printf "error: unknow argument\nuse -h option to see help information\n"
 			exit 1;;
@@ -91,6 +95,9 @@ else
 	else
 		gmt grdimage ${data} -R${range} -C${cptfile} -Bxag+l"${labels[0]}" -Bpya40g40+l"${labels[1]}" -JN${clon}/2i -K -P > $psfile
 	fi
+	if [[ $polyfile != 'null' ]]; then
+		gmt psxy $polyfile -JN${clon}/2i -R${range} -L -K -O >> $psfile
+	fi
 	#-C${cptfile}+Uk 使用km（色标单位除1000
 	#如果unit等于km则在cptfile后面添加+Uk
 	if [[ ${unit} == 'km+Uk' ]]; then