Re: Import error

[Salvador Cuñat]

Good night Michele.

On Wed, Nov 21, 2018 at 12:56:56PM +0100, Michele Di Cristo wrote:
> Good morning
> When I import my logbook with "smtk2ssrf" I get this error message
> "Warning: different number of gases (2) and cylinders (1)". All imported
>
The warning is quite common in galileo devices. I tcomes from
libedivecomputer detecting more gases set than cylinders. It shouldn't
harm.
> dives have the wrong location.
> For example: the 691 was at "Lago di Bracciano - Trevignano" while on
> subsurface appears "Tremiti, Punta della misericordia" (the dive No. 369)
>
Can you please confirm if you are using 4.8.4 version running on
windows?. I can't reproduce the issue on my own logs using linux
binaries built from sources.

> In addition, in the dive 691 I marked only one bookmark (and you can see in
> the graph) but on the subsurface many more appear.
>
Some alarms and warnings from galileo are not correctly parsed by
libdivecomputer and are reported as bookmarks. While in shallow water,
marks usually match safety-stop begining. Other common situation is
fast-ascent warnings.
In your dive, while hovering the mouse over the 1st marker, the info box
should display "segnalibro 1" while the other should display just
"segnalibro" translation.  You can simply edit or remove the added
markers right clicking on the mark.

Please confirm the SO and version you are using, so I can test on my
own files.

Best regards.

Salva.
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Re: Temperature vs. depth

[Linus Torvalds]

On Wed, Nov 21, 2018 at 6:43 AM Lutz Vieweg  wrote:
>
> They are slow responding in air, but under water, it usually takes just a few 
> seconds
> for them to change.

That's definitely not true.

I looked at my dive profiles, and I see things like "it took five
minutes for the temperature to stabilize".

This obviously depends on the dive computer and some will be much
better than others, but I really don't think the "temperature by
depth" can work in general. You're much better off looking at the time
progression, and just eye-balling how it matches with depth.

For example, looking at my dives in Bonaire, there was a clear
thermocline at around 105 ft on one dive, but almost all the other
dives were pretty much "constant water temperature", so I can clearly
look at just that dive.

And I had four dive computers with me on that dive:

 - the Suunto EON Core tracks depth pretty closely, and with a delay
of only about one minute. The profile looks sane and the temperature
profile matches is well with a 0.1°C resolution, just delayed a bit.
For nice slow descent/ascent, the one-minute delay is probably not
even all that noticeable.

 - the Garmin Descent Mk1 only gives you 1°C resolution, but like the
EON Core, it seems to be fairly quick to react (again, looking at the
profile, I'd say "roughly one minute" delay). But the 1C resolution
means that it's fairly noisy.

 - The Aqualung i770R  gives 1°F resolution,m but the delay looks like
it's about three minutes.

 - The Shearwater Perdix AI similarly gives 1°F resolution with a
three-minute delay.

The reason I say that the delay can be up to five minutes is that I
look at the Shearwater profiles, and on the dives where water
termperature was pretty much constant, it quite commonly takes about
five minutes for the sensor to stabilize from the air temperature.

Looking around at other dive trips:

 - Maui has almost no temperature gradients by recreational depths

 - Okinawa had temperature gradients, but the biggest ones seem to be
only indirectly about depth. The shore dives show a big temperature
gradient in shallow waters, but it looks like it's less about
"shallow" and more about "close to shore".

 - some of my dives show temperature fluctuations that seem to have
nothing to do with either surface or depth, and seem to be more about
currents etc

Basically, on the data I have, I don't really see anything that
indicates that doing some depth-to-temperature mapping makes much
sense. The thermoclines obviously *do* exist, but when they are clear
they are quite visible from the existing time-based model, and most of
the time they aren't clear at all and certainly not easy to associate
with depth because of delays and other noise.

  Linus
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Re: Temperature vs. depth

[Lutz Vieweg]

On 11/21/2018 09:32 AM, Jan Mulder wrote:
I feel that, while an interesting idea, this will not be tremendously useful. I see 2 main reasons 
for this. 1) Only fresh water dives show relevant thermoclines, and dives at sea tend to have a very 
limited temperature change over depth (over the typical range of diving depths).


I have experiences very pronounced thermoclines in the sea,
- in the gulf of Oman
- on many shores in Indonesia
- even at Isla del Cocos


And 2), more important, I think that a lot of DCs have a very poor temperature 
sensor (as in slow responding).


They are slow responding in air, but under water, it usually takes just a few 
seconds
for them to change.


But I've got a different suggestion for visualization: Instead of abusing the 
X-Axis
for something not time, just paint a background-color gradient (like from blue 
to purple or yellow)
instead of the current linear light-to-dark-blue background color gradient, to visualizes the 
temperature at depth.


Regards,

Lutz Vieweg




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Re: Temperature vs. depth

[tormento]

Or, simpler, put depth instead of time on x-axis and have all other
variables showed in function of it...

Il giorno mer 21 nov 2018 alle 12:35 Benjamin  ha
scritto:

> I really like the idea. Depending on where in the sea, the thermoclines
> can be felt here, especially in the Mediterranean.
>
>
>
> On Wed, 21 Nov 2018 at 12:23, Willem Ferguson <
> willemfergu...@zoology.up.ac.za> wrote:
>
>> On 2018/11/21 07:55, Robert Helling wrote:
>> > Hi,
>> >
>> > yesterday, I had an hour of time and I played around with an idea that
>> > I would like to get some feedback on (I already showed it to my wife
>> > and she absolutely hated it).
>> >
>> > The idea is not to show the temperature as a function of time as we
>> > currently do it but rather plot it against depth. I find it much less
>> > interesting what the temperature was 28 minutes into the dive but
>> > rather want to know what was the temperature at 12m of depth and in
>> > particular like to see the positions of thermoclines. So here is a
>> > mock up:
>>
>> I love your idea.
>>
>> wf
>>
>>
>>
>> --
>> This message and attachments are subject to a disclaimer.
>>
>> Please refer to
>> http://upnet.up.ac.za/services/it/documentation/docs/004167.pdf
>>  for
>> full
>> details.
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Re: Temperature vs. depth

[Benjamin]

I really like the idea. Depending on where in the sea, the thermoclines can
be felt here, especially in the Mediterranean.


On Wed, 21 Nov 2018 at 12:23, Willem Ferguson <
willemfergu...@zoology.up.ac.za> wrote:

> On 2018/11/21 07:55, Robert Helling wrote:
> > Hi,
> >
> > yesterday, I had an hour of time and I played around with an idea that
> > I would like to get some feedback on (I already showed it to my wife
> > and she absolutely hated it).
> >
> > The idea is not to show the temperature as a function of time as we
> > currently do it but rather plot it against depth. I find it much less
> > interesting what the temperature was 28 minutes into the dive but
> > rather want to know what was the temperature at 12m of depth and in
> > particular like to see the positions of thermoclines. So here is a
> > mock up:
>
> I love your idea.
>
> wf
>
>
>
> --
> This message and attachments are subject to a disclaimer.
>
> Please refer to
> http://upnet.up.ac.za/services/it/documentation/docs/004167.pdf
>  for
> full
> details.
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Re: Temperature vs. depth

[Willem Ferguson]

On 2018/11/21 07:55, Robert Helling wrote:

Hi,

yesterday, I had an hour of time and I played around with an idea that 
I would like to get some feedback on (I already showed it to my wife 
and she absolutely hated it).


The idea is not to show the temperature as a function of time as we 
currently do it but rather plot it against depth. I find it much less 
interesting what the temperature was 28 minutes into the dive but 
rather want to know what was the temperature at 12m of depth and in 
particular like to see the positions of thermoclines. So here is a 
mock up:


I love your idea.

wf



--
This message and attachments are subject to a disclaimer.

Please refer to 
http://upnet.up.ac.za/services/it/documentation/docs/004167.pdf 
 for
full 
details.

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Re: Temperature vs. depth

[Jan Mulder]

On 21-11-2018 08:48, Dirk Hohndel wrote:


On Nov 20, 2018, at 9:55 PM, Robert Helling > wrote:


yesterday, I had an hour of time and I played around with an idea that 
I would like to get some feedback on (I already showed it to my wife 
and she absolutely hated it).






My point is - I think this is worth more investigation.
An optional graph to the left of the main graph (the overlay seems odd). 
Easy to turn on and off with a button.

I'm curious to hear what others think, but this does seem quite interesting.
Oh, and I'd do it as a scatter plot...



I feel that, while an interesting idea, this will not be tremendously 
useful. I see 2 main reasons for this. 1) Only fresh water dives show 
relevant thermoclines, and dives at sea tend to have a very limited 
temperature change over depth (over the typical range of diving depths). 
And 2), more important, I think that a lot of DCs have a very poor 
temperature sensor (as in slow responding). That is, as you correctly 
said, already visible in the 1 mock up dive (and I believe that the used 
OSTC has a very decent, as in quick responding, temperature sensor).


In cave diving, water temperatures are relatively constant, but when 
there is a difference, the most interesting, is the place where that is, 
so directly related to time, like we have now. So no added value there.


--jan
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