[Proj] Slightly off-topic: The phantom island that is real

support.mn at elisanet.fi support.mn at elisanet.fi
Wed Nov 28 04:31:35 PST 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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