Add missing aliases to grdproject

pygmt/src/grdproject.py

@@ -16,15 +16,20 @@
 
 @fmt_docstring
 @use_alias(
+    C="center",
+    D="spacing",
+    E="dpi",
+    F="scaling",
     G="outgrid",
     J="projection",
     I="inverse",
+    M="unit",
     R="region",
     V="verbose",
     n="interpolation",
     r="registration",
 )
-@kwargs_to_strings(R="sequence")
+@kwargs_to_strings(C="sequence", R="sequence")
 def grdproject(grid, **kwargs):
     r"""
     Change projection of gridded data between geographical and rectangular.
@@ -58,6 +63,51 @@ def grdproject(grid, **kwargs):
         geographical [Default is False].
     {J}
     {R}
+    center : str or list
+        [*dx/dy*]
+        Let projected coordinates be relative to projection center [Default
+        is relative to lower left corner]. Optionally, add offsets in the
+        projected units to be added (or subtracted when `inverse` is set) to
+        (from) the projected coordinates, such as false eastings and
+        northings for particular projection zones [0/0].
+    spacing : str
+        *xinc*\ [**+e**\|\ **n**][/\ *yinc*\ [**+e**\|\ **n**]]
+        Set the grid spacing for the new grid. [Default is the same number of
+        output nodes as there are input nodes]. Optionally append a suffix
+        modifier.
+        **Geographical (degrees) coordinates**: Append
+        **m** to indicate arc minutes or **s** to indicate arc seconds. If one
+        of the units **e**, **f**, **k**, **M**, **n** or **u** is appended
+        instead, the increment is assumed to be given in meter, foot, km, Mile,
+        nautical mile or US survey foot, respectively, and will be converted to
+        the equivalent degrees longitude at the middle latitude of the region.
+        If *y_inc* is given but set to 0 it will be reset equal to *x_inc*;
+        otherwise it will be converted to degrees latitude.
+        **All coordinates**: If **+e** is appended
+        then the corresponding max *x* (*east*) or *y* (*north*) may be 
+        slightly adjusted to fit exactly the given increment [by default the 
+        increment may be adjusted slightly to fit the given domain]. Finally, 
+        instead of giving an increment you may specify the *number of nodes* 
+        desired by appending **+n** to the supplied integer argument; the 
+        increment is then
+        recalculated from the number of nodes and the domain.
+        **Note**: If `region` is used then the grid spacing (and registration)
+        have already been initialized; use `spacing` and `registration` to
+        override the values.
+    dpi : int
+        Set the resolution for the new grid in dots per inch.
+    scaling : str
+        [**c**\|\ **i**\|\ **p**\|\ **e**\|\ **f**\|\
+        **k**\|\ **M**\|\ **n**\|\ **u**].
+        Force 1:1 scaling, i.e., output or output data are in
+        actual projected meters [**e**]. To specify other units, append
+        **f** (foot), **k** (km), **M** (statute mile), **n** (nautical
+        mile), **u** (US survey foot), **i** (inch), **c** (cm), or **p**
+        (point).
+    unit : str
+            Append **c**, **i**, or **p** to indicate that cm, inch, or point
+            should be the projected measure unit. Cannot be used with 
+            `scaling`.
     {V}
     {n}
     {r}