On 10/10/2016 17:34, Robert Helling wrote:
The previous gas pressure graph was pretty precise and I could read the
exact compartment gas pressures from the graph and relate them to the
gradient factor (accepting there was no calibrated Y axis). I prefer
information that is as precise as possible, therefore this preference.
In contrast, for the heat map the colours are more qualitative, but I
still prefer as precise an interpretation of the colours as possible.
Therefore just a general notion of blue to red is not sufficient. For
instance, if I have a deco stage with orange in it, I want to understand
whether the inert gas pressures were very close to the M-value or not.
If the heat map cannot provide that information, it would not serve any
purpose for me. Therefore my strong preference for a much more explicit
interpretation of the heat map. Because of this, it took me some time to
get to terms with the heat map. In addition, if I have never seen a heat
map and I am reading the user manual for the first time, I would like to
have the full explanation, not only a notional summary. The user manual
is most useful for divers using these facilities of Subsurface for the
first time. If I were that diver, I would have preferred the 'full
On 10.10.2016, at 17:22, Willem Ferguson
give me a more precise indication of the unclear areas?
It was simply the shire number of references to part A, part B then
again A then C. Maybe the abstract letters don’t help. Could you use
more descriptive names every now and then?
In the end, it’s not so complicated: The heat map show how much gas is
in the tissues compared to the ambient pressure, all this as a
function of time. Blue colors mean less gas in the tissue and thus
on-gasing, green to red mean excess gas in the tissue to various
degrees and thus off-gassing. Fast to slow tissues from top to bottom.
Lots of yellow and red mean lots of seed for possible DCS. This is the
general idea, the more detailed version should be obvious from the
figures (I would hope). I would think being less explicit in the text
would help (because the reader needs to digest less information).
What do you think?
I hope my approach appears sane.
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