Re: OT: interesting global warming quote found elsewhwere

In article <8664b$48a1b466$23628@xxxxxxxxxxxxxxxxx>,
|||newspam|||@nezumi.demon.co.uk says...
Joerg wrote:
Martin Brown wrote:
Joerg wrote:
Don Klipstein wrote:

Those lines explain seasonal adjustment and another filter, and
methodology for getting filtered output through gaps in the raw data.

The "raw data" (determination of CO2 concentration for the month
without seasonal adjustment) is shown in column 5.

I think it's reasonable to show how the data looks with reasonable
filtering, such as subtracting the AC signal component with period
of 1 year. Especially if the unfiltered data is also shown.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Bingo! Your last sentence says it all.

These 1-D data are relatively easy to interpret. But most bulk raw
data is not - even for experts. Think about PET scans or MRI for example.

Some of the experiments I have done produced so much data and all in
the Fourier domain that noone could ever hope to look at it all
manually let alone "check it". You could write a program though. At
the time my datasets were pushing the limits. Calibrate and process it
with a Fourier transform or a better inverse method and the image
becomes obvious. Unless the target image is very simple not even an
expert can do a mental Fourier inverse by looking at the raw data.

Then there is still the problem of displaying an image with huge
dynamic range on the printed page with a limited 80:1 contrast ratio
if you are lucky (we never really solved that one).

Sure, but something like sea levels aren't that difficult. You need to
run some long averaging. But my request for the raw data was not
honored. Which I kind of expected.

Why do you think that these researchers should be at your beck and call
to provide you with raw data? Do you send circuit diagrams out to any
Tom, Dick or Harry that demands to see how something works?

I guess it all depends on who PAID for the data to be collected.
If it is MY tax dollars at work, or subsidized by MY tax dollars, I
certainly would expect them to have some type of prepared set of files
available for access under the freedom of information act.
In fact if it (the "results" of the data) were used by MY government to
dictate any type of public policy, I would expect the same.


But if you look in the right places a lot of the NASA TOPEX Poseidon
data is available online for FTP. eg.
Why work for something that might already have been bought and paid for?


http://podaac.jpl.nasa.gov/DATA_CATALOG/topex.html

I wish you luck reading through it. And if you particularly want access
to prevalidated early data you could register with them.


Sea levels are bit tricky too. Currents and water temperature, density
and atmospheric pressure together with the phase angle between moon and
sun considerably distort the equipotential surface. As well as the
obvious twice daily tides the tidal range has roughly monthly periodicity.

All the more reason to have more than one brain going over the numbers.

.

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