Do not need to reverse?

Dear friends,

I have a question. I used Cloud_Fraction_Liquid.ncl (see attachments) to
draw the plot for MYD08_D3.A2009001.005.2009048010832.hdf
(
ftp://ftp.hdfgroup.uiuc.edu/pub/outgoing/veer/MAP_DATA/files/LAADS/MYD/MYD08_D3/2009/001/MYD08_D3.A2009001.005.2009048010832.hdf
).

I thought I did not need to reverse the plot by using this:
lat=lat(::-1) ; use north-to-south latitude ordering

But finally the output
(MYD08_D3.A2009001.005.2009048010832_Cloud_Fraction_Liquid.pdf in the
attachments) looks wrong.

The reason I say the output is wrong is that:
>From the corresponding MYD08_D3.A2009001.005.2009048010832.hdf,
you can see:
the data in Cloud_Fraction_Liquid field has the first 30 rows full of fill
value,
and the data in YDim field is from 89.5 to -89.5.
These probably means the output plot will have blank areas in the north of
the earth. But my current output plot (in
MYD08_D3.A2009001.005.2009048010832_Cloud_Fraction_Liquid.pdf) has blank
areas in the south of the earth.

I think it should not be reversed (using the codes like lat=lat(::-1)) in
the ncl codes, but if not reverse, the plot looks wrong, could you please
tell me where came the problem? Thanks a lot.

Best,
Yi Wang

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