Apply suggestions from code review

Co-authored-by: Meghan Jones <meghanj@hawaii.edu>

Author: willschlitzer

pygmt/src/grdlandmask.py

@@ -18,7 +18,7 @@
 @use_alias(
     G="outgrid",
     R="region",
-    I="increment",
+    I="spacing",
     r="registration",
 )
 @kwargs_to_strings(R="sequence")
@@ -42,7 +42,7 @@ def grdlandmask(**kwargs):
     outgrid : str or None
         The name of the output netCDF file with extension .nc to store the grid
         in.
-    increment : str
+    spacing : str
         *xinc*\ [**+e**\|\ **n**][/\ *yinc*\ [**+e**\|\ **n**]].
         *x_inc* [and optionally *y_inc*] is the grid spacing. **Geographical
         (degrees) coordinates**: Optionally, append a increment unit. Choose
@@ -75,7 +75,7 @@ def grdlandmask(**kwargs):
           ``outgrid``)
     """
     if "I" not in kwargs.keys() or "R" not in kwargs.keys():
-        raise GMTInvalidInput("Region and increment must be specified.")
+        raise GMTInvalidInput("Region and spacing must be specified.")
 
     with GMTTempFile(suffix=".nc") as tmpfile:
         with Session() as lib:

pygmt/tests/test_grdlandmask.py

@@ -14,7 +14,7 @@ def test_grdlandmask_outgrid():
     Creates a grid land mask with an outgrid argument.
     """
     with GMTTempFile(suffix=".nc") as tmpfile:
-        result = grdlandmask(outgrid=tmpfile.name, increment=1, region=[-5, 5, -5, 5])
+        result = grdlandmask(outgrid=tmpfile.name, spacing=1, region=[-5, 5, -5, 5])
         assert result is None  # return value is None
         assert os.path.exists(path=tmpfile.name)  # check that outgrid exists
         result = (
@@ -27,7 +27,7 @@ def test_grdlandmask_no_outgrid():
     """
     Test grdlandmask with no set outgrid.
     """
-    temp_grid = grdlandmask(increment=1, region=[-5, 5, -5, 5])
+    temp_grid = grdlandmask(spacing=1, region=[-5, 5, -5, 5])
     assert temp_grid.dims == ("lat", "lon")
     assert temp_grid.gmt.gtype == 1  # Geographic grid
     assert temp_grid.gmt.registration == 0