| Re: Calculation of intersection on map [message #71667] |
Wed, 14 July 2010 06:49  |
Kenneth P. Bowman
Messages: 585
Registered: May 2000
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Senior Member |
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In article
<780593a9-2c5b-44fe-9905-d3a06c89c436@i18g2000pro.googlegroups.com>,
bjkuk <bjkuk12@gmail.com> wrote:
> Dear All,
> I am looking for pre-made routine or proramming tips to get
> intersection. I would like to calculate intersection from given two
> positions(A and B)
>
> If we know Latitude and Longitude of Point-A and Point-B, also the
> azimuth angles of Point-A and Point-B from the North. if azimuth
> angles is not parellel, those two lines will be cross. How do I
> calcuate this intersection point (cross point) precisely?
>
> Sincerely Yours
> B.J.Kuk
Have a look at "Intersection of two paths given start points
and bearings" on this page
http://www.movable-type.co.uk/scripts/latlong.html
BTW, the bearing lines always intersect,even if the azimuth
angles are the same. A proper bearing line follows a great
circle. On a sphere, great circles either are
the same circle, or they intersect at two antipodal points.
Ken Bowman
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| Re: Calculation of Intersection on Map [message #71752 is a reply to message #71670] |
Wed, 14 July 2010 16:15  |
bjkuk
Messages: 16
Registered: July 2010
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Junior Member |
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On 7월14일, 오후9시01분, Bruce Bowler <bbow...@bigelow.org> wrote:
> On Tue, 13 Jul 2010 23:55:55 -0700, bjkuk set fingers to keyboard and
> typed:
>
>> Dear All,
>> I am looking for pre-made routine or proramming tips to get
>> intersection. I would like to calculate intersection from given two
>> positions(A and B)
>
>> If we know Latitude and Longitude of Point-A and Point-B, also the
>> azimuth angles of Point-A and Point-B from the North. if azimuth angles
>> is not parellel, those two lines will be cross. This triangulation
>> mathmatics looks simple. however it is not easy to make code. How do I
>> calcuate this intersection point (cross point) precisely? or Is there
>> any pre-made routine?
>
>> Sincerely Yours
>> B.J.Kuk
>
> When ever I need formulae regarding navigation, I head to this website...
>
> http://williams.best.vwh.net/avform.htm
>
> I suspect you want the link that points to "Intersection of two radials"
>
> Bruce
Bruce!
Thank you for web-site introducing. I referred it.
B.J. Kuk
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| Re: Calculation of intersection on map [message #71753 is a reply to message #71667] |
Wed, 14 July 2010 16:14 |
bjkuk
Messages: 16
Registered: July 2010
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Junior Member |
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On 7월14일, 오후10시49분, "Kenneth P. Bowman" <k-bow...@null.edu> wrote:
> In article
> < 780593a9-2c5b-44fe-9905-d3a06c89c...@i18g2000pro.googlegroup s.com >,
>
> bjkuk <bjku...@gmail.com> wrote:
>> Dear All,
>> I am looking for pre-made routine or proramming tips to get
>> intersection. I would like to calculate intersection from given two
>> positions(A and B)
>
>> If we know Latitude and Longitude of Point-A and Point-B, also the
>> azimuth angles of Point-A and Point-B from the North. if azimuth
>> angles is not parellel, those two lines will be cross. How do I
>> calcuate this intersection point (cross point) precisely?
>
>> Sincerely Yours
>> B.J.Kuk
>
> Have a look at "Intersection of two paths given start points
> and bearings" on this page
>
> http://www.movable-type.co.uk/scripts/latlong.html
>
> BTW, the bearing lines always intersect,even if the azimuth
> angles are the same. A proper bearing line follows a great
> circle. On a sphere, great circles either are
> the same circle, or they intersect at two antipodal points.
>
> Ken Bowman
Thanks lot Ket Bowman.
The site you mentioned is very useful for me.
B.J. Kuk
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