Add polar and cartesian to -A description for grdbarg (#8230)

TO be similar to grdvector and prepare for long options polar and cartesian
GenericMappingTools · Dec 30, 2023 · 98cacce · 98cacce
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diff --git a/doc/rst/source/supplements/windbarbs/grdbarb.rst b/doc/rst/source/supplements/windbarbs/grdbarb.rst
@@ -69,8 +69,8 @@ Optional Arguments
 .. _-A:
 
 **-A**
-    The grid files contain (speed, theta) wind components instead of
-    (u, v) components [Default is (u, v)].
+    The grid files contain polar (speed, theta) wind components instead of
+    Cartesian (u, v) components [Default is (u, v)].
 
 .. |Add_-B| replace:: |Add_-B_links|
 .. include:: ../../explain_-B.rst_

diff --git a/src/windbarbs/grdbarb.c b/src/windbarbs/grdbarb.c
@@ -110,7 +110,7 @@ GMT_LOCAL int usage (struct GMTAPI_CTRL *API, int level) {
 	GMT_Usage (API, 1, "\n<gridx> <gridy> are grid files with the two wind components.");
 	GMT_Option (API, "J-");
 	GMT_Message (API, GMT_TIME_NONE, "\n  OPTIONAL ARGUMENTS:\n");
-	GMT_Usage (API, 1, "\n-A Grids have (speed, theta) components [Default is (u, v) components].");
+	GMT_Usage (API, 1, "\n-A Grids have polar (speed, theta) components [Default is Cartesian (u, v) components].");
 	GMT_Option (API, "B-");
 	GMT_Usage (API, 1, "\n-C[<cpt>]");
 	GMT_Usage (API, -2, "Color palette file to convert wind speed to colors. Optionally, name a master cpt "