[Proj] Slightly off-topic: The phantom island that is real
support.mn at elisanet.fi
support.mn at elisanet.fi
Wed Nov 28 07:31:35 EST 2012
Hehe,
the phantom military vessel theory is not totally excluded..
if there is a place that is 1400 m deep water when
a research vessel visited it and old maps show
whatever and so do new.. and nobody can 100%
confirm anything.. so I would put a military vessel
of what ever size as one of the possibilities..
until better researched
regards: Janne.
------------------------------------------------------------------------
Daniel Strebe [strebe at aol.com] kirjoitti:
> At 30_km x 6_km that would be one mighty aircraft carrier! Also, it shows up
> on 19th century maps, same shape, which would makes it a doubly impressive
> aircraft carrier.
>
> Best,
> --daan
>
> -----Original message-----
> From: support.mn at elisanet.fi
> To: proj at lists.maptools.org
> Sent: Tue, Nov 27, 2012 13:17:34 GMT+00:00
> Subject: Re: [Proj] Slightly off-topic: The phantom island that is real
>
> Hello,
>
> well it might also be a hiding place for a military vessel ..
> for example a large aircratft carrier ..
> that would explain the reason why it time
> to time disappears and comes back?
>
> at least the "sand island" top view is very
> much like an aircraft carrier? ;)
>
> http://static.ddmcdn.com/gif/aircraft-carrier-top-view.gif
>
> regards: Janne.
>
> -----------------------------------------------------------------------------
> -----------------------
>
> strebe at aol.com kirjoitti:
> >
> > Joaquim: Thank you for the explanation. But I think all you have done is
> confirm that the region is probably a large sand bar, sometimes submerged or
> partially submerged. There seems to be two reasons data is so sparse there:
> frequent cloud cover hindering remote sensing, and very shallow water that
> makes soundings by ship impossible.
> >
> > Here is a representative sample of MODIS data that I culled from USGSs
> Global Visualization Viewer:
> > http://commons.wikimedia.org/wiki/File:MODIS-MCD43A4-02-2004.png
> >
> > The particular MODIS data set is MCD43A4 (MODIS/Terra+Aqua Nadir
> BRDF-Adjusted Reflectance 16-Day L3 Global 500m SIN Grid). If you cycle
> through the months and years, you can clearly see that MODIS usually sees
> something there but sometimes does not. That means (to me) that sometimes
> the sand bar is submerged too far for the satellite to detect it but usually
> is shallow enough to yield a signal. None of the data are consistent with
> deep water.
> >
> > Regards,
> > daan Strebe
> >
> >
> >
> >
> > -----Original Message-----
> > From: J. Luis <jmfluis at gmail.com>
> > To: strebe <strebe at aol.com>
> > Sent: Sat, Nov 24, 2012 6:36 am
> > Subject: Re: [Proj] Slightly off-topic: The phantom island that is real
> >
> >
> > Daan
> >
> > Although we never phrased it out in those mails, it's quite obvious
> that what appears to an island in the SRTM+ is nothing but an
> interpolation artifact introduced by a constrain imposed the coastline
> itself. Notice how close the coastline and the 1 m meter contour lines
> are. Furthermore the maximum height in the SRTM+ data is 1m meter, which
> is obviously very suspicious. I'll add it also that the 'Walter' that
> appears in one of those mails is Walter Smith from the Smith & Sandwell
> bathymetry.
> >
> > HOWEVER, that does not rule out the possibility that the island
> exists. Only says that there is no reliable data to constrain the grid
> construction at that location. The 1400 m difference also puzzled me a
> bit and moved by your mail I searched also the MODIS data for Sea Surface
> Temperature ... and the mystery continues MODIS does not seam to find
> water over there. See the image that I posted in GMT mailing list.
> >
> >
> https://listserv.hawaii.edu/cgi-bin/wa?A2=ind1211&L=GMT-HELP&D=0&T=0&P=116217
>
> >
> > Regrads
> >
> > Joaquim
> >
> >
> > I dont follow your assertion. The e-mail you cite states the
> island DOES appear in GTOPO30 and SRM30+. I see the same
> thing. When I look at the raw values in SRTM30 Plus, the
> entire area of the island consists of sea-level DEM
> values. Plus, NASA Blue Marble satellite imagery
> clearly shows shallow water over the entire 30_km x
> 6_km area that is called
Sandy Island
on
> innumerable maps.
> >
> > Whether or not there is an
island
there (as opposed to a
> barely submerged sandbar) is perhaps open to
> debate or depends on the tides. But the crew of the
> research vessel is claiming 1,400_m soundings,
> which just does
> not coincide with that area at all
> >
> >
> >
> >
> > Regards,
> > daan Strebe
> >
> >
> >
> >
> >
> >
> > -----Original Message-----
> > From: J. Luis <jmfluis at gmail.com>
> > To: PROJ.4 and general Projections Discussions
> <proj at lists.maptools.org>
> > Cc: strebe <strebe at aol.com>
> > Sent: Fri, Nov 23, 2012 6:40 pm
> > Subject: Re: [Proj] Slightly off-topic: The phantom island
> that is real
> >
> >
> > We discussed that on the GMT list too and no, the island
> does NOT exist in the SRTM+ or GTOPO30 series
> >
> > See for example
> >
> https://listserv.hawaii.edu/cgi-bin/wa?A2=ind1211&L=GMT-HELP&D=0&T=0&P=107015
>
> >
> > Joaquim
> >
> >
> > The crew of a research ship claims to have undiscovered a
> large island in the South Pacifics Coral Sea near New
> Caledonia, called Sandy Island. The news feeds have
> picked up on this and its making its way around the
> geeksphere with great rapidity. Here is an example article:
> >
> http://phys.org/news/2012-11-aussie-scientists-un-discover-pacific-islandhtm
> l
> >
> > However, it is quite clear from satellite imagery and
> multiple data sources that the
island
in fact
> exists, though possibly it is a barely submerged sandbar.
> Yet the crew claims depths there are around 1,400 meters
> >
> > Obviously the ship was not where they say it was. The
> question is, how did the crew of this research vessel
> convince themselves they were sailing in the same
> area? I dont think a datum mismatch can account for this,
> given the size of the sandbar.
> >
> > I have started a thread here:
> >
> http://mapthematics.com/forums/viewtopic.php?f=10&t=469
> >
> > Enjoy!
> > daan Strebe
> >
> >
> >
> >
> >
> >
> >
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> >
> >
> >
> >
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