DODS download and frwite

[Mark Sponsler]

Hi,
I'm confused about setting increments on control files and doing subsequent
fwrite operations.  Example:

I'm looking at the topo files from the monsoondata DODs server. In
reviewing the data on the DODs server, it indicates all files are 4800 X
6000 increments but the output from the DODs client (when it's doing the
download) displays info like:
gxstart 0 gxstop 4800
gystart 0 gystop 6000

infering 4801 (0-4800) and 6001 (0-6000) increments.

So I took a chance and did the DODs operation as follows:

  'sdfopen http://www.monsoondata.org:9090/dods/topo/E100N40'
  'set fwrite E100N40.dat'
  'set gxout fwrite'
  'set x 0 4800'
  'set y 0 6000'

Then I built control files for these data files with increments of 4801 and
6001 respectively.

Then I did an open on these files as follows:

   'open topo.ctl'
   'set x 0 4800'
   'set y 0 6000

And performed some more operations writing the output using frwite as
follows:

   'set fwrite newtopo.dat'
   'set gxout fwrite'
   'set x 0 4800'
   'set y 0 6000'

And built control files for these data files with increments of 4801 and
6001 respectively.

The Problem is if I do a 'display' on the resulting output, the results
from a few of the are skewed in the x direction.  If I play with the
control file increments by reducing the x increment by 1, all dislpays AOK.

My question is:  Am I doing something wrong or is there problems with a few
of the topo files on the server?

Thanks in advance for any assistance!