[Dart-dev] [4414] DART/trunk/obs_sequence/obs_sequence_tool.html: Add a comment about how observations on the time boundaries

[nancy at ucar.edu]

Revision: 4414
Author:   nancy
Date:     2010-07-06 15:49:13 -0600 (Tue, 06 Jul 2010)
Log Message:
-----------
Add a comment about how observations on the time boundaries
are handled, and add a reminder about where the filter
assimilation window starts relative to the assimilation
data time (i.e. +1 sec on the window start time).

Modified Paths:
--------------
    DART/trunk/obs_sequence/obs_sequence_tool.html

-------------- next part --------------
Modified: DART/trunk/obs_sequence/obs_sequence_tool.html
===================================================================
--- DART/trunk/obs_sequence/obs_sequence_tool.html	2010-07-02 17:23:09 UTC (rev 4413)
+++ DART/trunk/obs_sequence/obs_sequence_tool.html	2010-07-06 21:49:13 UTC (rev 4414)
@@ -141,6 +141,17 @@
    gregorian_cal      = .true.
 /
 </pre>
+The time range is inclusive on both ends;
+observations with times equal to the boundary times will 
+be copied to the output.
+To split a single input file up into proper subsets
+(no replicated observations), the first time of the following
+output sequence should be +1 second from the last time of the previous 
+output sequence.   If the goal is to match an observation sequence file
+with an assimilation window during the execution of the 
+<em class="program">filter</em> program, the windows should be centered 
+around the assimilation time starting at minus 1/2 the window time 
+plus 1 second, and ending at exactly plus 1/2 the window time.
 
 <A NAME="keepobs"></A>
 <h3>Subset by Observation Type</h3>