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28-02-2021, 23:59
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#1
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Registered User
Join Date: Sep 2010
Location: Boat in Greece
Boat: Lagoon 400
Posts: 1,432
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Different projection for world mapping
https://earthsky.org/earth/astrophys...sign-world-map
Quote from the article:
You know the old problem of how to portray the round globe of Earth on a flat map? Now a trio of map experts has worked together to solve this problem. Their new map is 2-sided and round.
__________________
Mark, S/Y Bat-Yam
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02-03-2021, 17:47
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#2
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Registered User
Join Date: Mar 2011
Location: Southport CT
Boat: Sabre 402
Posts: 2,728
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Re: Different projection for world mapping
NOAA (USA) is getting ready to discontinue printed maps, so new projection isn't likely to change things much for us unless Garmin puts it on their screens.
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02-03-2021, 17:58
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#3
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Marine Service Provider
Join Date: Dec 2010
Location: Little Compton, RI
Boat: Cape George 31
Posts: 3,009
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Re: Different projection for world mapping
When you zoom in, though, a transverse Mercator projection is still going to be preferable in most latitudes. This is only useful as a whole-earth thing. But it's cool.
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Ben
zartmancruising.com
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02-03-2021, 21:42
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#4
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Registered User
Join Date: Sep 2010
Location: Boat in Greece
Boat: Lagoon 400
Posts: 1,432
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Re: Different projection for world mapping
I put it here as a general issue of interest to people interested in charting/navigation, not as something that will be implemented in the near future.
As to printed maps mentioned above, it does not matter. All our electronic charts are based on Mercator projection. So if the community will accept the new projection (I do not think it will...) it will be implemented also on our MFD's.
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Mark, S/Y Bat-Yam
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02-03-2021, 23:20
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#5
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Registered User
Join Date: Nov 2013
Location: Port Moresby,Papua New Guinea
Boat: FP Belize Maestro 43 and OPBs
Posts: 12,891
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Re: Different projection for world mapping
Doe that mean that around the equator you'll have to keep looking at the back of your chartplotter to get the full picture?
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03-03-2021, 00:21
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#6
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Registered User
Join Date: Sep 2010
Location: Boat in Greece
Boat: Lagoon 400
Posts: 1,432
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Re: Different projection for world mapping
Quote:
Originally Posted by StuM
Doe that mean that around the equator you'll have to keep looking at the back of your chartplotter to get the full picture?
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Well, I am not sure...
As it is a circular projection on flat surface I do not think that looking at the back will be helpful.
But - if we discard the flat screens of current MFD's and install globes in the cockpit....
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Mark, S/Y Bat-Yam
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03-03-2021, 00:43
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#7
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Registered User
Join Date: May 2014
Boat: Shuttleworth Advantage
Posts: 2,260
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Re: Different projection for world mapping
Sailing across the equator will really be like falling off the edge of the world.
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03-03-2021, 04:52
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#8
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Registered User
Join Date: Nov 2013
Location: Port Moresby,Papua New Guinea
Boat: FP Belize Maestro 43 and OPBs
Posts: 12,891
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Re: Different projection for world mapping
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03-03-2021, 17:06
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#9
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Registered User
Join Date: Nov 2019
Location: Gold Coast, Australia
Boat: Farr 43`
Posts: 479
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Re: Different projection for world mapping
Wow! - the earth really is flat.
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03-03-2021, 17:44
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#10
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Registered User
Join Date: Jul 2018
Location: SF Bay Area
Boat: Other people's boats
Posts: 1,108
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Re: Different projection for world mapping
Hmm... that's an interesting definition of "solve". If they're going to complain about how things appear to far apart on other maps, I'm curious how far this makes the UK appear from Argentina.
Since some might find it interesting, here's how the distortion works. Just bear in mind that they're stopping at the equator to avoid worst of it.
Azimuthal equidistant projection with Tissot's indicatrix
Kurubu, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons
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03-03-2021, 18:25
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#11
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Registered User
Join Date: Nov 2013
Location: Port Moresby,Papua New Guinea
Boat: FP Belize Maestro 43 and OPBs
Posts: 12,891
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Re: Different projection for world mapping
Quote:
I'm curious how far this makes the UK appear from Argentina.
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Depends on what line you follow over the edge to get to it.
Quote:
Originally Posted by requiem
Since some might find it interesting, here's how the distortion works. Just bear in mind that they're stopping at the equator to avoid worst of it.
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They're not "stopping" at the equator, thery're flipping to the other side so that the distortion decrease again back to zero as you approach the centre. Maximum distortion actually occurs at the equator.
And of course, you don't need to use the equator as the edge, you can use whatever great circle best suits your specific situation.
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03-03-2021, 19:33
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#12
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Registered User
Join Date: Oct 2016
Location: Vancouver Island
Boat: Hullmaster 27
Posts: 1,043
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Re: Different projection for world mapping
It's not exactly new either ...
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03-03-2021, 20:22
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#13
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Registered User
Join Date: Jul 2018
Location: SF Bay Area
Boat: Other people's boats
Posts: 1,108
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Re: Different projection for world mapping
Quote:
Originally Posted by StuM
They're not "stopping" at the equator, thery're flipping to the other side so that the distortion decrease again back to zero as you approach the centre. Maximum distortion actually occurs at the equator.
And of course, you don't need to use the equator as the edge, you can use whatever great circle best suits your specific situation.
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An interesting view; my mental picture was flipped around to have them stopping there and "restarting" from the south pole.
Your other comment makes me think that if you could easily change the centre point, and thus the great circle split, you would have a convenient means of working out great circle courses and distances. Then again, this implies software rather than paper, in which case why not simply do the maths?
This might actually be a convenient visualisation for planning longer passages, e.g. in OpenCPN, as the ranges to far destinations would remain consistent to the eye.
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03-03-2021, 21:09
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#14
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Registered User
Join Date: Nov 2013
Location: Port Moresby,Papua New Guinea
Boat: FP Belize Maestro 43 and OPBs
Posts: 12,891
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Re: Different projection for world mapping
Quote:
Originally Posted by Kelkara
It's not exactly new either ...
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Wow, 1672.
Thanks for that, I'd never come across that map before. Very interesting!
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03-03-2021, 23:48
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#15
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Registered User
Join Date: Sep 2010
Location: Boat in Greece
Boat: Lagoon 400
Posts: 1,432
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Re: Different projection for world mapping
Quote:
Originally Posted by requiem
An interesting view; my mental picture was flipped around to have them stopping there and "restarting" from the south pole.
Your other comment makes me think that if you could easily change the centre point, and thus the great circle split, you would have a convenient means of working out great circle courses and distances. Then again, this implies software rather than paper, in which case why not simply do the maths?
This might actually be a convenient visualisation for planning longer passages, e.g. in OpenCPN, as the ranges to far destinations would remain consistent to the eye.
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It probably will be more mathematically efficient to choose different center points for each voyage.
But, on the other hand, we all hold sort if mental picture of the world in our minds, based on long time of using maps/charts. It will be difficult to get used to a different projection each time.
I see it frequently during sailing. Some people sail with North up chart on the MFD and some like the Head up. And you cannot persuade anyone to switch to the other option.
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