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19990525: "Raw" AREA files corrupted?

>From: "Marek J. Kmiecik" <address@hidden>
>Organization: SUNYA/ASRC
>Keywords: 199905251943.NAA10577 Unidata-Wisconsin AREA

Marek,

>Are some of the "raw" AREA files representing "visual" images from
>GOES-8 and GOES-10 Satellites that are broadcasted
>from your Center (AREA0[7-8][0-5][0-9]) corrupted?
>Mainly, my suspect "AREA" files are:
> -rw-r--r--   1 10000    10000      231632 May 23 18:20 AREA0744
>-rw-r--r--   1 10000    10000      231632 May 23 18:20 AREA0745
>-rw-r--r--   1 10000    10000      269768 May 23 12:21 AREA0735
>-rw-r--r--   1 10000    10000      269768 May 23 12:21 AREA0736
>-rw-r--r--   1 10000    10000     1146896 May 23 14:20 AREA0740
>-rw-r--r--   1 10000    10000     1146896 May 23 14:20 AREA0739
>-rw-r--r--   1 10000    10000     1833344 May 23 15:19 AREA0741
>-rw-r--r--   1 10000    10000     2271908 May 23 07:40 AREA0809
>-rw-r--r--   1 10000    10000     2271908 May 23 07:39 AREA0808
>-rw-r--r--   1 10000    10000     2271908 May 23 11:21 AREA0734
>-rw-r--r--   1 10000    10000     2310044 May 23 09:38 AREA0811
>-rw-r--r--   1 10000    10000     2386316 May 23 13:39 AREA0815
>-rw-r--r--   1 10000    10000     2422016 May 23 12:38 AREA0814
>-rw-r--r--   1 10000    10000     2422016 May 23 11:39 AREA0813
>-rw-r--r--   1 10000    10000     2422016 May 23 15:39 AREA0817
>The sizes of these files(in bytes) are even less then the size of
>data they should represent according to the formula:
>map_size = dir[8]*(dir[9] + dir[14]); 

There were some problems with the images broadcast on May 21 and 22 as
is indicated in an email we received from Dave Dempsey of San Francisco
State University:

>From: Dave Dempsey <address@hidden>
>Organization: San Francisco State University
>Keywords: 199905241722.LAA00737 Unidata-Wisconsin imagery

>I notice that SSEC's neartime satellite image archive lacks GOES images
>for the period 23Z May 21 through 18Z May 22, and that the GOES-10
>visible images in the archive for 14Z, 16Z, 17Z, 19Z, 22Z, and 23Z May
>23 are at least partly truncated. As luck would have it, these images
>cover part of a 2.5-day coastal surge along the West Coast, one of the
>most spectacular that I've ever seen. It would be AWFULLY nice to
>construct a case study, but the GOES-10 visible satellite imagery is
>crucial for that.

I send a note to SSEC to see if they could back fill their archive
with corrected images and got the following reply:

"We managed to recover the to the neartime directory, the goes8 and goes10 data
that was lost over the weekend. Let us know if there are any anomallies."

I sent this information to Dave D. who then noted:

>From address@hidden  Tue May 25 12:50:36 1999
Thanks--I got the same message and retrieved the missing images. Most of the
images from 5/23, however, were not replaced and remain corrupted. I let them
know that.

I would guess that Dave's comment about corrupted images from May 23 are
the same ones that you are showing in the list above.  Since Dave let SSEC
know about those images, it is possible (likely?) that they will back fill
the archive with good images that span your need.

If you are not already aware of this, I want to let you know that Unidata
sites can access the data sent in the Unidata-Wisconsin datastream
that has been archived at SSEC by following the instructions in:

Unidata WWW HomePage
http://www.unidata.ucar.edu/
  Access to Archived Data
  http://www.unidata.ucar.edu/data/recovery.html
    Unidata-Wisconsin Archive
    http://www.unidata.ucar.edu/data/unirec.html

The access information you will need is:

machine: unidata.ssec.wisc.edu
user: XXXXXX
pass: XXXXXX
directory: neartime - for recent images
           urequest - for images reloaded onto disk as per user requests

>     Thank You,

I hope that this helps...

>             -Marek Kmiecik  
>````````````````````````````````````````````````````````````
>` Marek Kmiecik                                                   `    
>       
>` Scientific Programmer                                           `
>` State University of New York at Albany                   `
>` Center for Environmental Science & Technology Management `
>` Atmospheric Sciences Research Center                    ` 
>`                                                         `            
>` 251 Fuller Rd.                                          `
>` Albany, NY 12203                                        `
>` e-mail: address@hidden                  `
>` Tel: (518)437-8719                                      `
>` Fax: (518)437-8758                                      `
>` http://lunch.asrc.cestm.albany.edu/~marek               ` 
>`                                                         `
>````````````````````````````````````````````````````````````

Tom Yoksas