Crazy Data From NASA Or Bugs In My Programs?
While I'm waiting to hear from NASA, I've started doing a QA check both of my code and the Aqua Satellite AMSU data. The above picture shows an example of some of the things I've come across. The picture shows NASA's AMSU channel 5 data for every day in January, 2008, and January, 2009 through January, 2010 for all 30 footprints (14 months total). The view along the X axis is by footprint, with an average at the end. The data was generated by my AMSUSummary program and displayed in Apple Numbers.
You can see the obvious problems with the data. Channels 17 and 18 are just whacked. Channels 25 through 30 go in the wrong direction, and channels 1 through 6 have too high a value. Compare this to the more standard picture of what such a footprint snapshot should look like, shown below.
What 30 Footprints Should Look Like.
Below is the same data again, this time the X axis represents time.
And here's daily data from December 31st, 2009. This data has been through my QA process and none of the scans for channels 24 or 25 passed QA. The QA checks to make sure none of the data is more than +/- 50% of the expected readings as defined in the literature.
So the question is, is this strange data due to bugs in my code, or is this the way the data actually looks. I've already done QA checks on my code, but for this next week, I'll be going over it again to see where the problem lies.
So for the rest of the week expect QA posts from me. In addition to checking out the code and data, these posts will give good instructions on how to use the programs I've written so far.