Adding miscellaneous projections to gallery (#723)

* Add Hammer projection with default central meridian

* Add Hammer projection with prime meridian as central meridian

* Update misc_hammer.py region and central meridian default

* Add misc_mollweide.py

* Add misc_winkel_tripel.py

* Add misc_robinson.py

* Add misc_eckertIV.py

* Add misc_eckertVI.py

* Remove "projection" from titles

* Add misc_sinusoidal.py

* Add misc_van_der_grinten.py

* Update examples/projections/misc/misc_sinusoidal.py

Co-authored-by: Dongdong Tian <[email protected]>

* Update examples/projections/misc/misc_van_der_grinten.py

Co-authored-by: Dongdong Tian <[email protected]>

* Update explanation of d projection for all figures

Co-authored-by: Dongdong Tian <[email protected]>

Author: willschlitzer

examples/projections/misc/misc_eckertIV.py

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+"""
+Eckert IV
+=========
+
+``Kf[central meridian]/width``: Give the optional central meridian (default is the
+center of the region) and the map width.
+"""
+import pygmt
+
+fig = pygmt.Figure()
+# Use region "d" to specify global region (-180/180/-90/90)
+fig.coast(region="d", projection="Kf12c", land="ivory", water="bisque4", frame="afg")
+fig.show()

examples/projections/misc/misc_eckertVI.py

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+"""
+Eckert VI
+=========
+
+``Ks[central meridian]/width``: Give the optional central meridian (default is the
+center of the region) and the map width.
+"""
+import pygmt
+
+fig = pygmt.Figure()
+# Use region "d" to specify global region (-180/180/-90/90)
+fig.coast(region="d", projection="Ks12c", land="ivory", water="bisque4", frame="afg")
+fig.show()

examples/projections/misc/misc_hammer.py

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+"""
+Hammer
+======
+
+``H[central meridian]/width``: Give the optional central meridian (default is the center
+ of the region) and the map width.
+"""
+import pygmt
+
+fig = pygmt.Figure()
+# Use region "d" to specify global region (-180/180/-90/90)
+fig.coast(region="d", projection="H12c", land="black", water="cornsilk", frame="afg")
+fig.show()

examples/projections/misc/misc_mollweide.py

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+"""
+Mollweide
+=========
+
+``W[central meridian]/width``: Give the optional central meridian (default is the center
+ of the region) and the map width.
+"""
+import pygmt
+
+fig = pygmt.Figure()
+# Use region "d" to specify global region (-180/180/-90/90)
+fig.coast(region="d", projection="W12c", land="tomato1", water="skyblue", frame="ag")
+fig.show()

examples/projections/misc/misc_robinson.py

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+"""
+Robinson
+========
+
+``N[central meridian]/width``: Give the optional central meridian (default is the center
+ of the region) and the map width.
+"""
+import pygmt
+
+fig = pygmt.Figure()
+# Use region "d" to specify global region (-180/180/-90/90)
+fig.coast(region="d", projection="N12c", land="goldenrod", water="snow2", frame="afg")
+fig.show()

examples/projections/misc/misc_sinusoidal.py

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+"""
+Sinusoidal
+==========
+
+``I[central meridian]/width``: Give the optional central meridian (default is the center
+ of the region) and the map width.
+"""
+import pygmt
+
+fig = pygmt.Figure()
+# Use region "d" to specify global region (-180/180/-90/90)
+fig.coast(region="d", projection="I12c", land="coral4", water="azure3", frame="afg")
+fig.show()

examples/projections/misc/misc_van_der_grinten.py

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+"""
+Van der Grinten
+===============
+
+``V[central meridian]/width``: Give the optional central meridian (default is the center
+ of the region) and the map width.
+"""
+import pygmt
+
+fig = pygmt.Figure()
+# Use region "d" to specify global region (-180/180/-90/90)
+fig.coast(region="d", projection="V12c", land="gray", water="cornsilk", frame="afg")
+fig.show()

examples/projections/misc/misc_winkel_tripel.py

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+"""
+Winkel Tripel
+=============
+
+``R[central meridian]/width``: Give the optional central meridian (default is the center
+ of the region) and the map width.
+"""
+import pygmt
+
+fig = pygmt.Figure()
+# Use region "d" to specify global region (-180/180/-90/90)
+fig.coast(region="d", projection="R12c", land="burlywood4", water="wheat1", frame="afg")
+fig.show()