Hi Monica,

If both the runs have the same resolution then i think you just have to "set lat lat1 lat2" and "set lon lon1 lon2" in Grads, before defining "a1" and also "a2".

Faisal

Dear users,

I have two different files CHE that come from two different runs with different numbers of pixels:

One for iy=200 and jx = 200    and one for iy=185 and jx = 200.

Now, if I want to plot the aerosol optical depth map of the differences between the AOD from the first run and AOD from the second one using :

a1=ave(ave(aext8,z=1,z=18)*18,t=1,t=4) and

a2=ave(ave(aext8,z=1,z=18)*18,t=1,t=4)

dif=a1-a2

I have the error message:

Operation error: Incompatable grids
Dimension ranges aren't equivalent
Dimension = 0
1st grid range = -15 756   2nd = 1 771
Error ocurred at column 6
DEFINE error: Invalid expression.

Is there a way to plot the AOD differences for a lat-lon area that are common to the two files CHE?

Thank you fory your help!!

PhD.Monica Santese
CMCC - Physics Department - University of Salento
via Arnesano - 73100 Lecce, Italy

e-mail: monica.santese@le.infn.it
phone: +39-0832-297502 (office)
             +39-0832-297481 (laboratory)
fax:       +39 -0832-297505
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