Changes between Version 1 and Version 2 of OMI_use_global_obs

Timestamp:

Nov 25, 2020, 3:07:51 PM (4 years ago)

Author:

lnerger

Comment:

--

OMI_use_global_obs

@@ -17 +17 @@
   SUBROUTINE PDAFomi_set_domain_limits(lim_coords)
 
-    REAL, INTENT(in) :: lim_coords(2,2)     !< geographic coordinate array (1: longitude, 2: latitude)
-                                            !< ranges: longitude (-pi, pi), latitude (-pi/2, pi/2)
+    REAL, INTENT(in) :: lim_coords(2,2)     !< coordinate array (1: longitude, 2: latitude)
+                                            !< geographic range: longitude (-pi, pi), latitude (-pi/2, pi/2)
+                                            !< Cartesian range: (x) coordinate grows from left to right; (y) from bottom to top
 }}}
 here `lim_coords` are
- - (1,1) coordinate of the western edge of the domain
- - (1,2) coordinate of the eastern edge of the domain
- - (2,1) coordinate of the northern edge of the domain
- - (2,2) coordinate of the southern edge of the domain
-thus, (:,1) specifies the north-western corner of the sub-domain and (:,2) the souther-estern corner.
+{{{
+           (2,1)
+   (:,1)+---------+
+        |         |           - (1,1) coordinate of the western (or left) edge of the domain 
+        |         |           - (1,2) coordinate of the eastern (or right) edge of the domain 
+  (1,1) |         | (1,2)     - (2,1) coordinate of the northern (or upper) edge of the domain
+        |         |           - (2,2) coordinate of the southern (or lower) edge of the domain
+        |         |
+        +---------+(:,2)
+           (2,2)
+}}}
+thus, (:,1) specifies the north-western corner of the sub-domain and (:,2) the souther-estern corner. The first (x) coordinate grows from left to right, while the second coordinate (y) increases from bottom to the top.
 
 If the model grid is not decomposed in cardinal directions, but e.g. rotated, the coordinates should specife the extrema. Thus, lim_coords(1,1) would be the coordinate of the northernmost grid point of a domain.