(OAD) Document for Ozone Mapping and Profiler Suite ... - NASA

where
OAD – OMPS TC EDR D37031
Rev C5
Page 17
*
R ( P)
P
I � Ia
( I � I
�
meas � �
T � Sb
meas
P P P
P
I a � I0
� I1
cos� � I 2 cos 2�
2) Use Lagrange interpolation to determine R * for the given terrain pressure.
3) Set the cloud fraction , f * , equal to 0.
If It < Imeas < Ic:
1) Calculate cloud fraction according to:
I
f * �
I
2) If there is snow or ice on the ground:
�
meas
c
� I
� I
a. Assume there are no clouds
b. Calculate a reflectivity for the 1.0, 0.7, 0.4, and 0.1 pressure tables
using
( )
*
*
* Imeas
� Ia
R �
T � Sb
Imeas
� Ia
c. Use Lagrange interpolation and the terrain pressure to get the terrain
reflectivity
If Imeas > Ic:
1) Compute R* for the 1.0, 0.7, 0.4, and 0.1 atm tables:
where
R
�
*
meas � �
T � Sb
meas
t
t
a
P
a
I � Ia
( I � I )
P P P
P
I � I � I � � I cos 2�
2) Use Lagrange interpolation to obtain R*
3) Set f* = 1.
4) If snow or ice is present
a
0
1
cos 2
a. Assume there are no clouds
b. Calculate a reflectivity for the 1.0, 0.7, 0.4, and 0.1 pressure tables using
R
�
*
meas � �
T � Sb
meas
)
I � Ia
( I � I )
c) Use Lagrange interpolation and the terrain pressure to get the terrain
reflectivity
a