Cacluate the Rectangle coordinates on spherical surface

Hi,ALL

Thanks for your help.

There are two points with given coordinates.

So, let me connect with the two points to make a line( called center Line).

now, the rectangle is:(let me do assume)

There are two sides which are parallel.

and the distance between center Line and each parallel side is the same, let me assume it as 50 meters.

and the other two sides are vertical the line.

what I want to get are the coordinates of the rectangle corner.

(for example: left low corner coordindates and right upper corner coordinates)

Thanks in advanced

[611 byte] By [lvguangchuana] at [2007-10-2 16:39:30]