New roundabouts appear oval in Cartouche

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New roundabouts appear oval in Cartouche

Postby AlanOfTheBerg » Tue Jan 04, 2011 12:34 am

Hello all,

I am curious about why, when I create a roundabout, it appears to be oblong in Cartouche, stretched East-to-West. At least, it appears that way in Cartouche. And so I try to fix it to make it look round, but then it looks screwed up in the client.

Now, most of my mapping work is done around the 45th parallel, 1/2 way between equator and polar cap. Could this be happening because of the apparent North-South "flattening" when going from spherical to cartesian, and over-compensating for the longer distances between longitudes? Am I even making any sense with this post? I'm confusing myself. :)

I just know that in Cartouche, my roundabouts look oval, but they are (closer to) round in the client.
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Re: New roundabouts appear oval in Cartouche

Postby AlanOfTheBerg » Tue Jan 04, 2011 5:51 pm

harling wrote:We have a few perfectly circular roundabouts in my area, and in the aerial photographs they are ovals due to the angle at which they were taken.

Thanks for confirming.

rl_pl wrote:Is it because you have one of the wide screen displays which became popular lately and your graphic card resolution does not match its aspect?

:D It is widescreen, but the resolution is set to match at 1680x1050, which isn't quite 16:9. At home it's 1920x1080.
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Re: New roundabouts appear oval in Cartouche

Postby CBenson » Tue Jan 04, 2011 11:57 am

rl_pl wrote:Is it because you have one of the wide screen displays which became popular lately and your graphic card resolution does not match its aspect?


I keep my display in portrait orientation and my roundabouts come out oblong stretched east to west too.
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Re: New roundabouts appear oval in Cartouche

Postby harling » Tue Jan 04, 2011 6:20 am

AlanOfTheBerg wrote:I am curious about why, when I create a roundabout, it appears to be oblong in Cartouche, stretched East-to-West... Could this be happening because of the apparent North-South "flattening" when going from spherical to cartesian...?

That was my assumption. We have a few perfectly circular roundabouts in my area, and in the aerial photographs they are ovals due to the angle at which they were taken. By matching the width of the circle, the height turns out correct. It's more tricky to get it right when the roundabout is not perfectly circular, but after a couple you get the hang of it.
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Re: New roundabouts appear oval in Cartouche

Postby rlpl » Tue Jan 04, 2011 10:23 am

Is it because you have one of the wide screen displays which became popular lately and your graphic card resolution does not match its aspect?
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