TO DO AN EVAD ANALYSIS:
_____________________________________________________________________

A.  What you need

    1.  An edited radar volume with reflectivity (and/or power) and
        unfolded velocity data.
    2.  An input file for the "vad-analysis" (this produces the data
        file with the rings for the EVAD analysis).
    3.  An input file for the "evad" analysis.

B.  How to run the programs (executables in /usr/local/bin)

    1.  Type:  vad-analysis < vad_input_file
        (This runs the VAD analysis which produces the data rings for
         the evad analysis, this must be done first)
    2.  Type:  evad < evad_input_file
        (This runs the evad analysis)

C.  What about the vad_input_file

    Example: (Possibly located in /usr/tsaxen/Examples)

MIT_921222_1621.puf                  (line 1)
Voutput22dec92_1621.CDF              (line 2)
Voutput22dec92_1621.log              (line 3)
Voutput22dec92_1621.prn              (line 4)
VT                                   (line 5)
DM                                   (line 6)
DT                                   (line 7)
0                                    (line 8)
0                                    (line 9)
32000                                (line 10)
2                                    (line 11)
100000                               (line 12)
30000.                               (line 13)
20000.                               (line 14)
.FALSE.                              (line 15)
2                                    (line 16)
0.                                   (line 17)
0.                                   (line 18)
0.3                                  (line 19)
30.                                  (line 20)
1.                                   (line 21)
-32768.                              (line 22)
-10.                                 (line 23)
7                                    (line 24)
8                                    (line 25)
2.                                   (line 26)
10.                                  (line 27)
1.5                                  (line 28)
1                                    (line 29)
1                                    (line 30)


1:  Name of the edited universal format radar file
2:  Name given to the binary output file which is used to do the evad analysis
3:  Name given to the ouput log file
4:  Name given to the ascii "printed" results file
5:  Variable name of the velocity field in the .uf file
6:  Variable name of the reflected power field in the .uf file (optional)
7:  Variable name of the reflectivity field in the .uf file
8:  Number of rays to skip at start of volume
9:  Number of elevations to skip at start of volume
10: Number of elevations to process
11: Numver of rings to skip at start of every elevation
12: Number of rings to process
13: Maximum horizontal range (m)
14: Maximum altitude (m)
15: Unfolding will be done (.TRUE. or .FALSE.)

    16 - 18 are only meaningful if 15 is .TRUE.

16: First ring to begin ring-to-ring unfolding
17: Wind direction at ground (deg from)
18: Wind speed at ground (m/s)
19: Maximum allowable elevation deviation (deg) (0.3 recommended)
20: Maximum azimuth gap (deg) (30 recommended)
21: Minimum velocity magnitude (m/s) (1 recommended)
22: Minimum reflected power (dBm)
23: Minimum reflectivity (dBz)
24: Number of Fourier terms in ring (7 recommended)
25: Minimum number of data points in ring (1+value in line 24 recommended)
26: Maximum residual to keep datum (std. dev.) (2 is recommended)
27: Maximum residual to keep datum (m/s) (10 is recommended)
28: Minimum std. dev. to continue cleaning data (1.5 is recommended)
29 and 30: unknown

Further details can be found in the documentation in vad_analysis.doc in

     /usr/dbx/blp/app/vad/4.0/vad

Note:  The variables described in that documentation are the same, but the
       set-up of the input files are different.  This was done by dbx to 
       modify the code to standart fortran and to be compatible with PltGKS.


D.  What about the evad_input_file

    Example: (Possibly located in /usr/tsaxen/Examples)

Voutput22dec92_1621.CDF                  (line 1)
Eoutput22dec92_1621a.CDF                 (line 2)
Eoutput22dec92_1621a.log                 (line 3)
Eoutput22dec92_1621a.prn                 (line 4)
30000.                                   (line 5)
500.                                     (line 6)
8                                        (line 7)
3                                        (line 8)
12000.                                   (line 9)
0.                                       (line 10)
25.                                      (line 11)
0.                                       (line 12)
90.0                                     (line 13)
301.1                                    (line 14)
2520.0                                   (line 15)
288.5                                    (line 16)
5600                                     (line 17)
0.65                                     (line 18)
2                                        (line 19)
0.95                                     (line 20)


1:  Name of binary input file (output from VAD analysis)
2:  Name for two output files in PltGKS format
3:  Name of output log file
4:  Name of ascii "printed" results file
5:  Maximum horizontal range of analysis (m)
6:  Depth of analysis layers (m)
7:  Minimum number of rings in a layer
8:  Minimum number of different elevations in a layer
9:  Altitude of top boundary (m above sea level)
10: Vertical air velocity at top boundary (m/s)
11: Altitude of bottom boundary (m above sea level)
12: Vertical air velocity at bottom boundary (m/s)
13: Altitude of first sounding point (m above sea level)
14: Virtual temperature at first sounding point (K)
15: Altitude of second sounding point (m above sea level)
16: Virtual temperature at second sounding point (K)
17: Altitude of third sounding point (m about sea level)
18: Air density at third sounding point (kg/m**3)
19: Plotting mode 
20: Probability within confidence limits 

Further details can be found in the documentation in evad.doc in

     /usr/dbx/blp/app/vad/4.0/evd

Same note as in C. applies.


E.  What is the final output (i.e. the format of the output file from line 4 of 
    the evad_input_file, the .prn file)


**(From evad.doc in /usr/dbx/blp/app/vad/4.0/evd)

In the first and second tables are listed the parameters that are defined in
layers.

In the first table, for each layer are listed the layer number ("Layer"), the
altitude of the bottom of the layer ("Bottom"), the altitude of the top of the
layer ("Top"),  the radar reflectivity factor in the layer ("dBZ"), the
horizontal divergence in the layer ("Div"), and the adjusted horizontal
divergence in the layer ("Div Adj"). Following the horizontal divergence and
the adjusted horizontal divergence is the standard error of the parameter
("se") and the value that, when added and subtracted from the parameter value,
gives the specified confidence limits ("+-Limits").

In the second table, for each layer are listed the layer number ("Layer"), the
altitude of the bottom of the layer ("Bottom"), the altitude of the top of the
layer ("Top"), the vertical hydrometeor velocity in the layer ("WP"), and the
hydrometeor terminal fall speed in the layer ("Term Spd").  Following the
vertical hydrometeor velocity and the hydrometeor terminal fall speed is the
standard error of the parameter ("se") and the value that, when added and
subtracted from the parameter value, gives the specified confidence limits
("+-Limits").

In the third table are listed the parameters that are defined at edges of the
layers.  For each layer are listed the level number ("Level"), the altitude
("Altitude"), the air density ("Density"), the vertical air velocity obtained
from an upward integration ("WA Up"), the vertical air velocity obtained from a
downward integration ("WA Down"), and the adjusted vertical air velocity ("WA
Adj").  Following the three vertical air velocities is the standard error of
the parameter ("se") and the value that, when added and subtracted from the
parameter value, gives the specified confidence limits ("+-Limits").