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Calculating radius width
This is a discussion on Calculating radius width within the MapPoint 2006/2009 Discussion forums, part of the Map Forums category; Hi friends, If i draw a radius and i right click,how do i find out programatically,that a particular latitude and ...
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12-02-2006
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| Re: Calculating radius width
Hi, - 1 arc second is exacly 1 sea mile on equator and in latitude - in longitude if not on equator multiply with Cos(latitude) So you know the center of the circle, and you can calculate the distance. Wait, I give you a peace of code that calculate the distance to 2 point. It is in one of my boardcomputers to calculate birds view distance. It is in c but you can easy convert it. Dont mind the bearing, you need de distance: Code: u_16 get_bearing(double lat1, double lon1, double lat2, double lon2, u_32* miles)
{
double lat = lat2 - lat1;
double lon = (lon2 - lon1) * cos(deg2rad((lat1 + lat2) / 2));
double dist = hypot(lat, lon);
double bear = rad2deg(acos(lat / dist));
if (nv->par.km)
*miles = (u_32)(dist * 60 * 10 * 1.852);
else
*miles = (u_32)(dist * 60 * 10 * 1.852 / 1.609);
if (lon < 0) // Western direction
bear = 360 - bear;
return bear;
}
__________________ rgds, Wilfried Mestdagh www.mestdagh.biz MapPoint coding demo Order MapPoint 2009 with Routing and User Tools Spreadsheet         |
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| Tags |
| calculating, radius, width |
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