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Sample Noaaport Statistics

MBytes Frames Products Bytes/Frame
22 14835 4260 1491
20 11605 4369 1683
78 30013 4331 2591
22 12778 4444 1710
21 12200 4250 1683
71 27933 4115 2529
26 15064 4886 1696
23 12366 4405 1825
71 28194 4333 2528
41 18216 4720 2273
34 15641 4740 2147
75 30556 4824 2455
KBytes Frames Products
74 49 14
65 39 15
259 100 14
73 43 15
68 41 14
236 93 14
85 50 16
75 41 15
238 94 14
138 61 16
112 52 16
250 102 16

The data in the table on the left is taken at five minutes intervals during one hour. The table on the right is a calculated average per second. The columns in the table on the left side represent the following quantities:

  1. the total number of bytes received in each interval (in Mega bytes)
  2. the total number of frames in the interval
  3. the total number of products in the interval
  4. the first column divided by the second column, i.e., the average size of each frame (in bytes).

Taking averages here can be a bit misleading. For example, some of the satellite images are made of more than 3000 frames, some of the frames being very small (because they are transmitted in compressed form), and some of average size. Thus while this table suggests that each product contains, on average, a few (4 or 5 ) frames, there are exceptions that deviate substantially from this pattern.

Nevertheless, to get an idea indicative of how much a noaaport system can stress the computer, the per-second average of these quantities is given in table on the right-hand side. It is important to keep in mind that, as already mentioned, some products are made of several (2-4) thousand frames, and to be able to not miss a single one imposes a significant requirement on the computer assigned to this job.