distance to the horizon
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Don't forget: 0. height of the observer.
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots. -- Robert Royall
also eyesight of the observer the width of the tower (if it's .5" wide, nobody will be able to see it from 19 miles out)
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Don't forget: 0. height of the observer.
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots. -- Robert Royall
And the style of shoes he's wearing (heels can be significant)
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Don't forget: 0. height of the observer.
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots. -- Robert Royall
The color of the drilling platform (0,0,255) is better then (255,0,0).
The narrow specialist in the broad sense of the word is a complete idiot in the narrow sense of the word. Advertise here – minimum three posts per day are guaranteed.
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The color of the drilling platform (0,0,255) is better then (255,0,0).
The narrow specialist in the broad sense of the word is a complete idiot in the narrow sense of the word. Advertise here – minimum three posts per day are guaranteed.
http://www.boatsafe.com/kids/distance.htm
............................. Two words you don't ever want to hear. "Fix bayonets" US Marine Corps When the pin is pulled, Mr. Grenade is not our friend.
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http://www.boatsafe.com/kids/distance.htm
............................. Two words you don't ever want to hear. "Fix bayonets" US Marine Corps When the pin is pulled, Mr. Grenade is not our friend.
http://en.wikipedia.org/wiki/Horizon
............................. Two words you don't ever want to hear. "Fix bayonets" US Marine Corps When the pin is pulled, Mr. Grenade is not our friend.
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OK, put your thinking caps on. What is the distance that one can see an object that is 250 feet tall, from the shore. acceptable answers will be an average, considering the earth is an oblate spheroid. The reason is, I would like to know how far i can put a drilling platform so it won't be seen from shore.
Tomorrow will be better than today, even better than yesterday
just paint the whole thing sky blue...then it will blend into the background ;)
Steve
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And the style of shoes he's wearing (heels can be significant)
*sigh* I meant to type the eyeheight of the observer, my brain's on vacation today, and I'm not going to get a chance to follow it in any form for 10 more days.
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots. -- Robert Royall
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just paint the whole thing sky blue...then it will blend into the background ;)
Steve
Only if you use GMs Sky Blue paint, haze grey is closer to the actual paint color, low to the horizon you always have haze effects even it's clear above.
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots. -- Robert Royall
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http://en.wikipedia.org/wiki/Horizon
............................. Two words you don't ever want to hear. "Fix bayonets" US Marine Corps When the pin is pulled, Mr. Grenade is not our friend.
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OK, put your thinking caps on. What is the distance that one can see an object that is 250 feet tall, from the shore. acceptable answers will be an average, considering the earth is an oblate spheroid. The reason is, I would like to know how far i can put a drilling platform so it won't be seen from shore.
Tomorrow will be better than today, even better than yesterday
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how far from the shore is the oil?
Sheer brilliance! :-D I salute you, Sir!
Cheers, Vıkram.
"if abusing me makes you a credible then i better give u the chance which didnt get in real" - Adnan Siddiqi.
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OK, put your thinking caps on. What is the distance that one can see an object that is 250 feet tall, from the shore. acceptable answers will be an average, considering the earth is an oblate spheroid. The reason is, I would like to know how far i can put a drilling platform so it won't be seen from shore.
Tomorrow will be better than today, even better than yesterday
Muhadeeb66 wrote:
The reason is, I would like to know how far i can put a drilling platform so it won't be seen from shore.
EAsy... place drilling platform.... if you can see it, yell at them to move it that-a-way, repeat until they cannot hear you.... pick up cell phone and call them... repeat until cell phone signal is lost... pick up nav-com satellite phone... repeat until you can't see them. Hold at that location and repeat operation morning, noon and night until you can't see it based on atmospheric lens operations which are weather specific. Hold at that location for a full year repeating as necessary for seasonal changes in atmospheric lenses.... or calculate based on spherical trig, add maximum angle of deflection for atmospheric lenses, place unit.
_________________________ Asu no koto o ieba, tenjo de nezumi ga warau. Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb) John Andrew Holmes "It is well to remember that the entire universe, with one trifling exception, is composed of others."
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The color of the drilling platform (0,0,255) is better then (255,0,0).
The narrow specialist in the broad sense of the word is a complete idiot in the narrow sense of the word. Advertise here – minimum three posts per day are guaranteed.
Deyan Georgiev wrote:
The color of the drilling platform (0,0,255) is better then (255,0,0).
the color of a drilling platform is even better as 0,0,255,0 too! alpha 0 is handy!
_________________________ Asu no koto o ieba, tenjo de nezumi ga warau. Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb) John Andrew Holmes "It is well to remember that the entire universe, with one trifling exception, is composed of others."
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molesworth wrote:
You should also be adjusting for atmospheric refraction!
That's true, if you want complete precision, but I was going for an approximation...
Graham Bradshaw wrote:
That's true, if you want complete precision
it really is not that difficult. We've been doing angle of deflection for visible and IR for ages. :) handy when you start in optics. :)
_________________________ Asu no koto o ieba, tenjo de nezumi ga warau. Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb) John Andrew Holmes "It is well to remember that the entire universe, with one trifling exception, is composed of others."
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Muhadeeb66 wrote:
how far i can put a drilling platform so it won't be seen from shore.
If your the kind of person with the authority to be positioning a drilling platform, you should probably already know this. (Or at least have people working for you who can tell you). Or are you considering building an illegal drilling platform at don't want the police on the shore to spot it? :laugh:
Simon
Simon Stevens wrote:
If your the kind of person with the authority to be positioning a drilling platform, you should probably already know this.
I only place ships, and **I** know this, can visualize, calculate it in real-time and map it with tidal fluctuations for the next month....
_________________________ Asu no koto o ieba, tenjo de nezumi ga warau. Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb) John Andrew Holmes "It is well to remember that the entire universe, with one trifling exception, is composed of others."
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I don't suppose you know how to derive those formulas...
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots. -- Robert Royall
dan neely wrote:
I don't suppose you know how to derive those formulas...
what do you need? tangential visibility on the WGS-84 ellipsoid or Clarke-1866 ellipsoid? :-D
_________________________ Asu no koto o ieba, tenjo de nezumi ga warau. Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb) John Andrew Holmes "It is well to remember that the entire universe, with one trifling exception, is composed of others."
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You haven't given enough information for me to give you a completely correct answer. I'll need: 1. direction you are looking, and your lattitude (the Earth is not spherical, as you say) 2. position of Sun and Moon (for the tides) 3. current air pressure (also affects sea level) 4. Wind speed and direction (for waves) :laugh:
Graham Bradshaw wrote:
current air pressure (also affects sea level)
air-pressure, and temperature also affect the incident of refraction for the atmosphere. It isn't an illusion, some days you can see part way over the common horizon, especially on cold mornings when the pressure is right. :)
_________________________ Asu no koto o ieba, tenjo de nezumi ga warau. Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb) John Andrew Holmes "It is well to remember that the entire universe, with one trifling exception, is composed of others."
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*sigh* I meant to type the eyeheight of the observer, my brain's on vacation today, and I'm not going to get a chance to follow it in any form for 10 more days.
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots. -- Robert Royall
dan neely wrote:
eyeheight
eyeheight sir! :-D
dan neely wrote:
my brain's on vacation today, and I'm not going to get a chance to follow it in any form for 10 more days.
com'on... if I can survive a 6 hour meeting with my sanity more or less the same (we won't say normal here), you can swing it! :-D mental vacation is better than none at all! :-D
_________________________ Asu no koto o ieba, tenjo de nezumi ga warau. Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb) John Andrew Holmes "It is well to remember that the entire universe, with one trifling exception, is composed of others."
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just paint the whole thing sky blue...then it will blend into the background ;)
Steve
Steve Mayfield wrote:
just paint the whole thing sky blue...then it will blend into the background
just paint it alpha 0 and glBlendFunc(GL_SRC_ALPHA,GL_ONE); :) it always worked for me.
_________________________ Asu no koto o ieba, tenjo de nezumi ga warau. Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb) John Andrew Holmes "It is well to remember that the entire universe, with one trifling exception, is composed of others."
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dan neely wrote:
I don't suppose you know how to derive those formulas...
what do you need? tangential visibility on the WGS-84 ellipsoid or Clarke-1866 ellipsoid? :-D
_________________________ Asu no koto o ieba, tenjo de nezumi ga warau. Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb) John Andrew Holmes "It is well to remember that the entire universe, with one trifling exception, is composed of others."
I'd settle for deriving the perfect sphere approximation model actually. Working off an ellipsoid doesn't help when the only data I have is planet/moon/large asteroid/etc has a radius of Y. Also there's a reasonable chance I'll be able to remember how to derive the spherical model when I need it again...
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots. -- Robert Royall