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Subject: how to judge if an arc of a great circle crosses a quadrangle and calculate the positions of the intersects of on a sphere surface From: Ha Date: 12 Mar, 2010 10:43:07 Message: 1 of 16 
The story below happens on Earth surface. 
Subject: how to judge if an arc of a great circle crosses a quadrangle From: Walter Roberson Date: 12 Mar, 2010 10:58:34 Message: 2 of 16 
Ha wrote: 
Subject: how to judge if an arc of a great circle crosses a quadrangle From: Ha Date: 12 Mar, 2010 11:42:08 Message: 3 of 16 
Walter Roberson <roberson@hushmail.com> wrote in message <hnd6or$jlu$1@canopus.cc.umanitoba.ca>... 
Subject: how to judge if an arc of a great circle crosses a quadrangle and calculate the positions of the intersects of on a sphere surface From: Roger Stafford Date: 12 Mar, 2010 22:34:06 Message: 4 of 16 
"Ha " <scifiles@126.com> wrote in message <hnd5rr$4eq$1@fred.mathworks.com>... 
Subject: how to judge if an arc of a great circle crosses a quadrangle and From: TideMan Date: 13 Mar, 2010 00:01:25 Message: 5 of 16 
On Mar 13, 11:34 am, "Roger Stafford" 
Subject: how to judge if an arc of a great circle crosses a quadrangle and calculate the positions of the intersects of on a sphere surface From: Matt J Date: 13 Mar, 2010 00:27:08 Message: 6 of 16 
"Ha " <scifiles@126.com> wrote in message <hnd5rr$4eq$1@fred.mathworks.com>... 
Subject: how to judge if an arc of a great circle crosses a quadrangle and calculate the positions of the intersects of on a sphere surface From: Roger Stafford Date: 13 Mar, 2010 01:40:23 Message: 7 of 16 
"Matt J " <mattjacREMOVE@THISieee.spam> wrote in message <hnem4s$b39$1@fred.mathworks.com>... 
Subject: how to judge if an arc of a great circle crosses a quadrangle and calculate the positions of the intersects of on a sphere surface From: Ha Date: 14 Mar, 2010 12:52:06 Message: 8 of 16 
hi, guys. thanks for all your suggestions and discussions. I have looked throug and I'll read them carefully soon. All the points I'm considering are places in an area on the Earth surface with the longest distance up to ~5 degrees (~560km) and mean distance ~20km. Thus, only the smaller arc of a great circle is to be considered. 
Subject: how to judge if an arc of a great circle crosses a quadrangle and calculate the positions of the intersects of on a sphere surface From: Matt J Date: 14 Mar, 2010 13:10:05 Message: 9 of 16 
"Ha " <scifiles@126.com> wrote in message <hnim5l$6ga$1@fred.mathworks.com>... 
Subject: how to judge if an arc of a great circle crosses a quadrangle and calculate the positions of the intersects of on a sphere surface From: Roger Stafford Date: 14 Mar, 2010 16:52:05 Message: 10 of 16 
"Ha " <scifiles@126.com> wrote in message <hnim5l$6ga$1@fred.mathworks.com>... 
Subject: how to judge if an arc of a great circle crosses a quadrangle and calculate the positions of the intersects of on a sphere surface From: Ha Date: 16 Mar, 2010 03:04:05 Message: 11 of 16 
"Matt J " <mattjacREMOVE@THISieee.spam> wrote in message <hnin7d$mv0$1@fred.mathworks.com>... 
Subject: how to judge if an arc of a great circle crosses a quadrangle and calculate the positions of the intersects of on a sphere surface From: Ha Date: 16 Mar, 2010 03:05:20 Message: 12 of 16 
"Roger Stafford" <ellieandrogerxyzzy@mindspring.com.invalid> wrote in message <hnj47l$7st$1@fred.mathworks.com>... 
Subject: how to judge if an arc of a great circle crosses a quadrangle From: Ha Date: 16 Mar, 2010 03:22:08 Message: 13 of 16 

Subject: how to judge if an arc of a great circle crosses a quadrangle From: Walter Roberson Date: 16 Mar, 2010 03:49:09 Message: 14 of 16 
Ha wrote: 
Subject: how to judge if an arc of a great circle crosses a quadrangle From: Walter Roberson Date: 16 Mar, 2010 06:06:16 Message: 15 of 16 
>Ha wrote 
Subject: how to judge if an arc of a great circle crosses a quadrangle From: Ha Date: 16 Mar, 2010 06:46:06 Message: 16 of 16 
Walter Roberson <roberson@hushmail.com> wrote in message 
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