Potato Earth (.gif) !!! ?

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Potato Earth (.gif) !!! ?

Postby mavericko » Tue May 14, 2013 4:57 am

Image

Source:
http://www.asu.cas.cz/~bezdek/vyzkum/ro ... _globe/#1c

Just wondering, about what could be the practical use of this picture ..!!

But then I longed to see a picture of Earth, with the water vaporized out! Is there such a picture ?
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Re: Potato Earth (.gif) !!! ?

Postby Hammer_Time » Tue May 14, 2013 5:19 am

Ah, so that is the earth without the water...it is sorta potato-shaped... :specs:

I prefer potatos like this though:

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Re: Potato Earth (.gif) !!! ?

Postby Celt » Tue May 14, 2013 6:31 am

This isn;t a picture of earth without water it is a graphical representail of the gravitational differentiation on the curface of the earth, i.e. the blue is where the effect of gravity is slightly lower and red is where it is slightly higher. This is important if you want to make very precise measurements, but also can reveal some of the earth geomagnetic substructure.
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Re: Potato Earth (.gif) !!! ?

Postby DIREWOLF75 » Tue May 14, 2013 9:55 am

Celt wrote:This isn;t a picture of earth without water it is a graphical representail of the gravitational differentiation on the curface of the earth, i.e. the blue is where the effect of gravity is slightly lower and red is where it is slightly higher. This is important if you want to make very precise measurements, but also can reveal some of the earth geomagnetic substructure.

Thank you. I was wondering somewhat in that direction but couldn´t find anything to confirm or deny.

And of course, i live in a red area(or in that direction at least)... :roll: :fist:
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Re: Potato Earth (.gif) !!! ?

Postby Hammer_Time » Tue May 14, 2013 3:31 pm

Ah, now that makes more sense...

Still looks like a potato though! :)
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Re: Potato Earth (.gif) !!! ?

Postby Fuzz » Tue May 14, 2013 6:14 pm

Celt, its actually not a gravitation anomaly map, its a Geoid height, which is based on I believe deviation from average. Its important for things like GPS, map datums, elevation maps etc. Its not strictly an elevation map because it takes into account the "potato" shape of the Earth. its obviously exaggerated but it shows the Earth is not round, and for accurate measurements, we need to take this into account. If you are trying to model the Earth on a map, you need a representation of this built into your calculations.

For reference, this is the gravity anomaly map Celt was referencing:
http://earthobservatory.nasa.gov/Features/GRACE/Images/geoids_sm.jpg
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Re: Potato Earth (.gif) !!! ?

Postby Celt » Tue May 14, 2013 6:58 pm

Ok I was simplifying . . . Do you really think I want to go into a description of equipotential surfaces with H_T? LOL
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Re: Potato Earth (.gif) !!! ?

Postby Fuzz » Tue May 14, 2013 7:09 pm

Well, you never know! Plus it says Geoid Height right on there! :D
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Re: Potato Earth (.gif) !!! ?

Postby Hammer_Time » Tue May 14, 2013 8:53 pm

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:lol:
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Re: Potato Earth (.gif) !!! ?

Postby Celt » Tue May 14, 2013 10:44 pm

Yes but how many people understand that terminology . . .
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Re: Potato Earth (.gif) !!! ?

Postby Sauron_Daz » Tue May 14, 2013 11:18 pm

Hammer_Time wrote:Ah, so that is the earth without the water...it is sorta potato-shaped... :specs:

I prefer potatos like this though:

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Many of us do..
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Re: Potato Earth (.gif) !!! ?

Postby Sauron_Daz » Tue May 14, 2013 11:19 pm

DIREWOLF75 wrote:
Celt wrote:This isn;t a picture of earth without water it is a graphical representail of the gravitational differentiation on the curface of the earth, i.e. the blue is where the effect of gravity is slightly lower and red is where it is slightly higher. This is important if you want to make very precise measurements, but also can reveal some of the earth geomagnetic substructure.

Thank you. I was wondering somewhat in that direction but couldn´t find anything to confirm or deny.

And of course, i live in a red area(or in that direction at least)... :roll: :fist:


Me too..
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Re: Potato Earth (.gif) !!! ?

Postby Sauron_Daz » Tue May 14, 2013 11:19 pm

Celt wrote:Ok I was simplifying . . . Do you really think I want to go into a description of equipotential surfaces with H_T? LOL

:lol: :lol:
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Re: Potato Earth (.gif) !!! ?

Postby Hammer_Time » Wed May 15, 2013 2:29 pm

Celt wrote:Yes but how many people understand that terminology . . .


What that means?? :mrgreen: :lol:
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Re: Potato Earth (.gif) !!! ?

Postby Fuzz » Wed May 15, 2013 4:54 pm

Celt wrote:Yes but how many people understand that terminology . . .


Sorry, as the Geographic Operations Director, I just kinda assumed everyone did. :twisted:
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Re: Potato Earth (.gif) !!! ?

Postby Celt » Thu May 16, 2013 4:07 am

Come on, you should have remembered that Sauron only understands the middle bits of the earth . . .
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Re: Potato Earth (.gif) !!! ?

Postby Sauron_Daz » Thu May 16, 2013 6:48 am

They're yummie..
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Re: Potato Earth (.gif) !!! ?

Postby Hammer_Time » Thu May 16, 2013 10:14 am

:lol:
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Re: Potato Earth (.gif) !!! ?

Postby Sauron_Daz » Thu May 16, 2013 10:31 pm

Fuzz wrote:
Celt wrote:Yes but how many people understand that terminology . . .


Sorry, as the Geographic Operations Director, I just kinda assumed everyone did. :twisted:


Not very scientific.. :incoming:
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Re: Potato Earth (.gif) !!! ?

Postby Fuzz » Fri May 17, 2013 4:23 am

Maybe you should take a closer look at my title...
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