From: "Dr. Gerrit Hoogenboom" <[log in to unmask]>
To: Multiple recipients of list DSSAT <[log in to unmask]>
Date:         Sun, 23 Apr 1995 13:58:57 EDT
Subject:      New model graphics in DSSAT
 
This week there seemed to have been some confusion about the graphics
options in the new DSSAT v3.
 
1. When you select the GRAPH option under Models, the list of variables
you see displayed under GROWTH, WATER, NITROGEN etc. is controlled by the
individual output files of the crop models.
 
2.  The current models have two output options : a "short" one which displays
11 variables, and a "long" one which can display up to 46 variables per
indvidual option (GROWTH, WATER, etc.).
 
 
3.  This output option is set by a "switch" in the control section of
fileX.  You modify this switch through XCREATE or an editor.  Another
option is to use option 12 "Output Control" of Sensitivity Analysis in
the models.
 
4.  The measured variables displayed in the graph are read from fileT.  The
linkage between fileT and the crop model output files is through a file called
DATA.CDE which contains header codes and definitions.  You can access this
file in DSSAT through DATA - Background - Codes.  The codes used in fileT
need to match the codes of the crop model files to able to compare simulated
and measured data.
 
5.  The "user-selected" variables under "graph" of the model selection
allows you to combine variables normally displayed in different sections
such as Growth, Water, Nitrogen, etc.  For instance in this option you can
combine root length density and water content for each individual soil layer.
 
6.  If you feel that the variables displayed under the "long" option of the
models is inadequate or does not match your measured variables, you need
to contact one of the model developers or modify the model code yourself.
We feel that we have covered most of the variables the models can predict
under the long option in each specific section.
 
7.  A probabily unknown feature to many of you is the use of the graphics
program for display of measured data ONLY.  If you select Experiment
under the DATA section, and then select Utilities - Graphs, you can
display your measured data :
DATA --> Experiment --> Utilities --> Graphs
 
You first need to select your field data file before you will be able to
graph your data.
 
8.  If you want to graph data for which there is no code in the DATA.CDE
file, you can modify this file as explained earlier :
DATA --> Background --> Codes --> Data
 
 
If any of these options is unclear, please let me know.
 
Gerrit
 
 
 
Dr. Gerrit Hoogenboom                |  Dept. of Biol. and Agric. Eng.
Assistant Professor                  |  Georgia Station
Internet : GHOOGEN @                 |  The University of Georgia
           GAES.GRIFFIN.PEACHNET.EDU |  Griffin, Georgia 30223-1797 USA
                                                 PHONE: (404)-228-7216
                                                 FAX:   (404) 228-7218