| Re: Divide the world into hexagons [message #72918] |
Tue, 19 October 2010 01:18  |
jkeller
Messages: 35
Registered: October 2009
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Member |
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On Oct 18, 7:33 pm, Ed Hyer <ejh...@gmail.com> wrote:
> Thanks Ken!
>
> Looks like there's some relevant code out there in MATLAB:
>
> http://people.sc.fsu.edu/~jburkardt/m_src/sphere_grid/sphere _grid.html
>
> But still a lot of work to turn that into even a rudimentary Earth
> coordinate system.
>
> What I am actually hoping to get out of this is a cheap way to bin
> observations into equal-size areas across the globe. This does not
> require a full geoid or other complications.
>
> --Edward H.
>
A while back I wrote IDL code to plot such a grid. If you are
interested I could send you a copy.
Sincerely,
Jan
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| Re: Divide the world into hexagons [message #72920 is a reply to message #72918] |
Mon, 18 October 2010 10:33  |
MarioIncandenza
Messages: 231
Registered: February 2005
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Senior Member |
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Thanks Ken!
Looks like there's some relevant code out there in MATLAB:
http://people.sc.fsu.edu/~jburkardt/m_src/sphere_grid/sphere _grid.html
But still a lot of work to turn that into even a rudimentary Earth
coordinate system.
What I am actually hoping to get out of this is a cheap way to bin
observations into equal-size areas across the globe. This does not
require a full geoid or other complications.
--Edward H.
On Oct 18, 9:02 am, "Kenneth P. Bowman" <k-bow...@null.edu> wrote:
> In article
> < 3493fa57-c263-4cdb-a375-8f06146cd...@42g2000prt.googlegroups .com >,
> Ed Hyer <ejh...@gmail.com> wrote:
>
>> I recall reading a paper some time back where the rectangular lat/lon
>> grid was replaced with a hexagonal grid, whose polygons did not change
>> size with distance from the poles. Does anyone know where there might
>> be some code to create these grids? Not thinking specifically of
>> graphics, although any routine that could generate the graphical part
>> could also do the part I'm interested in.
>
>> Any leads welcome,
>
>> --Edward H.
>
> There are a number of global meteorological models that use a
> grid based on an icosahedron, which has 20 faces, each face is an
> identical equilateral triangle.
>
> Try googling "icosahedral atmospheric model", e.g.,
>
> http://www.wrfportal.org/CIRA-Magazine-GIMTool.pdf
>
> Note that the resulting grid is not perfectly uniform. Most cells
> are hexagons. Some cells near the vertices of the original
> icosahedron are pentagons. Also, it is not possible to make the
> hexagons complete regular, but they are close.
>
> Ken Bowman
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| Re: Divide the world into hexagons [message #72924 is a reply to message #72920] |
Mon, 18 October 2010 09:02 |
Kenneth P. Bowman
Messages: 585
Registered: May 2000
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Senior Member |
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In article
<3493fa57-c263-4cdb-a375-8f06146cd67c@42g2000prt.googlegroups.com>,
Ed Hyer <ejhyer@gmail.com> wrote:
> I recall reading a paper some time back where the rectangular lat/lon
> grid was replaced with a hexagonal grid, whose polygons did not change
> size with distance from the poles. Does anyone know where there might
> be some code to create these grids? Not thinking specifically of
> graphics, although any routine that could generate the graphical part
> could also do the part I'm interested in.
>
> Any leads welcome,
>
> --Edward H.
There are a number of global meteorological models that use a
grid based on an icosahedron, which has 20 faces, each face is an
identical equilateral triangle.
Try googling "icosahedral atmospheric model", e.g.,
http://www.wrfportal.org/CIRA-Magazine-GIMTool.pdf
Note that the resulting grid is not perfectly uniform. Most cells
are hexagons. Some cells near the vertices of the original
icosahedron are pentagons. Also, it is not possible to make the
hexagons complete regular, but they are close.
Ken Bowman
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| Re: Divide the world into hexagons [message #93880 is a reply to message #72918] |
Mon, 14 November 2016 20:50 |
chnicoloso
Messages: 1
Registered: November 2016
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Junior Member |
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On Tuesday, October 19, 2010 at 1:18:28 AM UTC-7, jkeller wrote:
> On Oct 18, 7:33 pm, Ed Hyer <ejh...@gmail.com> wrote:
>> Thanks Ken!
>>
>> Looks like there's some relevant code out there in MATLAB:
>>
>> http://people.sc.fsu.edu/~jburkardt/m_src/sphere_grid/sphere _grid.html
>>
>> But still a lot of work to turn that into even a rudimentary Earth
>> coordinate system.
>>
>> What I am actually hoping to get out of this is a cheap way to bin
>> observations into equal-size areas across the globe. This does not
>> require a full geoid or other complications.
>>
>> --Edward H.
>>
>
> A while back I wrote IDL code to plot such a grid. If you are
> interested I could send you a copy.
>
> Sincerely,
> Jan
Hello!
I came across your post. Would you be able to send me a copy as well?
Thank you!
Best,
Christian
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