Adding cylindrical projections to gallery (#727)

* Add cyl_transverse_mercator.py
* Add cyl_universal_transverse_mercator.py
* Changing land color to red in cyl_mercator.py to match GMT docs example; changing units from US to SI
* Add cyl_equidistant.py
* Add cyl_equal_area.py
* Add cyl_miller.py

examples/projections/cyl/cyl_equal_area.py

@@ -0,0 +1,18 @@
+"""
+Cylindrical equal-area
+======================
+
+``Ylon0/lat0/width``: Give central meridian ``lon0``, the standard parallel ``lat0``, and the figure ``width``.
+"""
+import pygmt
+
+fig = pygmt.Figure()
+# Use region "d" to specify global region (-180/180/-90/90)
+fig.coast(
+    region="d",
+    projection="Y35/30/12c",
+    water="dodgerblue",
+    shorelines="thinnest",
+    frame="afg",
+)
+fig.show()

examples/projections/cyl/cyl_equidistant.py

@@ -0,0 +1,18 @@
+"""
+Cylindrical equidistant
+=======================
+
+``Qwidth``: Give the figure ``width``.
+"""
+import pygmt
+
+fig = pygmt.Figure()
+# Use region "d" to specify global region (-180/180/-90/90)
+fig.coast(
+    region="d",
+    projection="Q12c",
+    land="tan4",
+    water="lightcyan",
+    frame="afg",
+)
+fig.show()

examples/projections/cyl/cyl_mercator.py

@@ -8,5 +8,5 @@
 import pygmt
 
 fig = pygmt.Figure()
-fig.coast(region=[0, 360, -80, 80], frame="afg", land="gray", projection="M0/0/8i")
+fig.coast(region=[0, 360, -80, 80], frame="afg", land="red", projection="M0/0/12c")
 fig.show()

examples/projections/cyl/cyl_miller.py

@@ -0,0 +1,18 @@
+"""
+Miller cylindrical
+==================
+
+``J[lon0/]width``: Give the optional central meridian ``lon0`` and the figure ``width``.
+"""
+import pygmt
+
+fig = pygmt.Figure()
+fig.coast(
+    region=[-180, 180, -80, 80],
+    projection="J-65/12c",
+    land="khaki",
+    water="azure",
+    shorelines="thinnest",
+    frame="afg",
+)
+fig.show()

examples/projections/cyl/cyl_transverse_mercator.py

@@ -0,0 +1,19 @@
+"""
+Transverse Mercator
+===================
+
+``T[lon0/][lat0/]width``: Give central meridian ``lon0``, the latitude of the
+origin ``lat0`` (optional), and the figure width.
+"""
+import pygmt
+
+fig = pygmt.Figure()
+fig.coast(
+    region=[20, 50, 30, 45],
+    projection="T35/12c",
+    land="lightbrown",
+    water="seashell",
+    shorelines="thinnest",
+    frame="afg",
+)
+fig.show()

examples/projections/cyl/cyl_universal_transverse_mercator.py

@@ -0,0 +1,19 @@
+"""
+Universal Transverse Mercator
+=============================
+
+``U[UTM Zone/][lat0/]width``: Give UTM Zone ``UTM Zone``, and the figure width.
+"""
+import pygmt
+
+fig = pygmt.Figure()
+# UTM Zone is set to 52R
+fig.coast(
+    region=[127.5, 128.5, 26, 27],
+    projection="U52R/12c",
+    land="lightgreen",
+    water="lightblue",
+    shorelines="thinnest",
+    frame="afg",
+)
+fig.show()