Convert projection table from reStructuredText to Markdown (#3363)

Author: yvonnefroehlich

doc/techref/index.md

@@ -8,6 +8,6 @@ visit the {gmt-docs}`GMT Technical Reference <reference.html>`.
 ```{toctree}
 :maxdepth: 1
 
-projections.rst
+projections.md
 encodings.md
 ```

doc/techref/projections.md

@@ -0,0 +1,49 @@
+---
+myst:
+  substitutions:
+    lon0: "lon{sub}`0`"
+    lat0: "lat{sub}`0`"
+    lon1: "lon{sub}`1`"
+    lat1: "lat{sub}`1`"
+    lat2: "lat{sub}`2`"
+    lonp: "lon{sub}`p`"
+    latp: "lat{sub}`p`"
+---
+
+# GMT Map Projections
+
+The table below shows the projection codes for the 31 GMT map projections:
+
+| PyGMT Projection Argument | Projection Name |
+| --- | --- |
+| **A**{{ lon0 }}/{{ lat0 }}[/*horizon*]/*width*              | {doc}`Lambert azimuthal equal area </projections/azim/azim_equidistant>` |
+| **B**{{ lon0 }}/{{ lat0 }}/{{ lat1 }}/{{ lat2 }}/*width*    | {doc}`Albers conic equal area </projections/conic/conic_albers>` |
+| **C**{{ lon0 }}/{{ lat0 }}/*width*                          | {doc}`Cassini cylindrical </projections/cyl/cyl_cassini>` |
+| **Cyl_stere**/[{{ lon0 }}/[{{ lat0 }}/]]*width*             | {doc}`Cylindrical stereographic </projections/cyl/cyl_stereographic>` |
+| **D**{{ lon0 }}/{{ lat0 }}/{{ lat1 }}/{{ lat2 }}/*width*    | {doc}`Equidistant conic </projections/conic/conic_equidistant>` |
+| **E**{{ lon0 }}/{{ lat0 }}[/*horizon*]/*width*              | {doc}`Azimuthal equidistant </projections/azim/azim_equidistant>` |
+| **F**{{ lon0 }}/{{ lat0 }}[/*horizon*]/*width*              | {doc}`Azimuthal gnomonic </projections/azim/azim_gnomonic>` |
+| **G**{{ lon0 }}/{{ lat0 }}[/*horizon*]/*width*              | {doc}`Azimuthal orthographic </projections/azim/azim_orthographic>` |
+| **G**{{ lon0 }}/{{ lat0 }}/*width*[**+a***azimuth*][**+t***tilt*][**+v***vwidth*/*vheight*][**+w***twist*][**+z***altitude*] | {doc}`General perspective </projections/azim/azim_general_perspective>` |
+| **H**[{{ lon0 }}/]*width*                                   | {doc}`Hammer equal area </projections/misc/misc_hammer>` |
+| **I**[{{ lon0 }}/]*width*                                   | {doc}`Sinusoidal equal area </projections/misc/misc_sinusoidal>` |
+| **J**[{{ lon0 }}/]*width*                                   | {doc}`Miller cylindrical </projections/cyl/cyl_miller>` |
+| **Kf**[{{ lon0 }}/]*width*                                  | {doc}`Eckert IV equal area </projections/misc/misc_eckertIV>` |
+| **Ks**[{{ lon0 }}/]*width*                                  | {doc}`Eckert VI equal area </projections/misc/misc_eckertVI>` |
+| **L**{{ lon0 }}/{{ lat0 }}/{{ lat1 }}/{{ lat2 }}/*width*    | {doc}`Lambert conic conformal </projections/conic/conic_lambert>` |
+| **M**[{{ lon0 }}/[{{ lat0 }}/]]*width*                      | {doc}`Mercator cylindrical </projections/cyl/cyl_mercator>` |
+| **N**[{{ lon0 }}/]*width*                                   | {doc}`Robinson </projections/misc/misc_robinson>` |
+| **Oa**{{ lon0 }}/{{ lat0 }}/*azimuth*/*width*[**+v**]       | {doc}`Oblique Mercator, 1: origin and azimuth </projections/cyl/cyl_oblique_mercator_1>` |
+| **Ob**{{ lon0 }}/{{ lat0 }}/{{ lon1 }}/{{ lat1 }}/*width*[**+v**] | {doc}`Oblique Mercator, 2: two points </projections/cyl/cyl_oblique_mercator_2>` |
+| **Oc**{{ lon0 }}/{{ lat0 }}/{{ lonp }}/{{ latp }}/*width*[**+v**] | {doc}`Oblique Mercator, 3: origin and pole </projections/cyl/cyl_oblique_mercator_3>` |
+| **P***width*[**+a**][**+f**[**e**\|**p**\|*radius*]][**+r***offset*][**+t***origin*][**+z**[**p**\|*radius*]] | {doc}`Polar </projections/nongeo/polar>` [azimuthal] ({math}`\theta, r`) (or cylindrical) |
+| **Poly**/[{{ lon0 }}/[{{ lat0 }}/]]*width*                  | {doc}`Polyconic </projections/conic/polyconic>` |
+| **Q**[{{ lon0 }}/[{{ lat0 }}/]]*width*                      | {doc}`Equidistant cylindrica </projections/cyl/cyl_equidistant>` |
+| **R**[{{ lon0 }}/]*width*                                   | {doc}`Winkel Tripel </projections/misc/misc_winkel_tripel>` |
+| **S**{{ lon0 }}/{{ lat0 }}[/*horizon*]/*width*              | {doc}`General stereographic </projections/azim/azim_general_stereographic>` |
+| **T**{{ lon0 }}[/{{ lat0 }}]/*width*                        | {doc}`Transverse Mercator </projections/cyl/cyl_transverse_mercator>` |
+| **U***zone*/*width*                                         | {doc}`Universal Transverse Mercator (UTM) </projections/cyl/cyl_universal_transverse_mercator>` |
+| **V**[{{ lon0 }}/]*width*                                   | {doc}`Van der Grinten </projections/misc/misc_van_der_grinten>` |
+| **W**[{{ lon0 }}/]*width*                                   | {doc}`Mollweide </projections/misc/misc_mollweide>` |
+| **X***width*[**l**\|**p***exp*\|**T**\|**t**][/*height*[**l**\|**p***exp*\|**T**\|**t**]][**d**] | {doc}`Linear </projections/nongeo/cartesian_linear>`, {doc}`logarithmic </projections/nongeo/cartesian_logarithmic>`, {doc}`power </projections/nongeo/cartesian_power>`, and time |
+| **Y**{{ lon0 }}/{{ lat0 }}/*width*                          | {doc}`Cylindrical equal area </projections/cyl/cyl_equal_area>` |