Stereographic map with small extension

Q&A
2

You need to use map scale rather than map width and so some calculations, e.g.

gmt begin arctic_map png
	W1=$(gmt mapproject -R0/360/65/90 -Js0/90/72/1:25000000 -Ww)
	H1=$(gmt mapproject -R0/360/65/90 -Js0/90/72/1:25000000 -Wh)
	W2=$(gmt mapproject -R0/360/55/90 -Js0/90/72/1:25000000 -Ww)
	H2=$(gmt mapproject -R0/360/55/90 -Js0/90/72/1:25000000 -Wh)
	dx=$(gmt math -Q $W1 $W2 SUB 2 DIV =)
	dy=$(gmt math -Q $H1 $H2 SUB 2 DIV =)
    gmt coast -R0/360/65/90 -Js0/90/72/1:25000000 -Dh -Wthinnest,black -Ir/faint,lightblue -B0
    gmt coast -EGL,IS+c -R0/360/55/90 -X${dx} -Y${dy}
    gmt coast -Dh -Wthinnest,red -Ir/faint,lightblue
    gmt coast -Q
gmt end show
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