How to calculate the middle point between two points on the Earth in matlab?
47 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Ray Lee
am 9 Jul. 2015
Kommentiert: Ted Shultz
am 20 Aug. 2019
Given the latitudes and longitudes of two points, how to get the middle point efficiently?
My trouble is there are millions of point pairs to calculate....
2 Kommentare
James Tursa
am 9 Jul. 2015
Bearbeitet: James Tursa
am 9 Jul. 2015
Middle point on a great circle arc assuming a sphere? Or something else?
How is your data stored?
Akzeptierte Antwort
Mohammad Abouali
am 10 Jul. 2015
Bearbeitet: Mohammad Abouali
am 10 Jul. 2015
Go to this page you will find bunch of useful formula. The one that you are looking for is called "midpoint" on that page. You have the JavaScript code, but implementation is rather easy
% lat1,lat2,lon1,lon2 should be in radian
Bx = cos(lat2) * cos(lon2-lon1);
By = cos(lat2) * sin(lon2-lon1);
latMid = atan2(sin(lat1) + sin(lat2), ...
sqrt( (cos(lat1)+Bx)*(cos(lat1)+Bx) + By*By ) );
lonMid = lon1 + atan2(By, cos(lat1) + Bx);
1 Kommentar
Ted Shultz
am 20 Aug. 2019
Here is the matlab code of the formula provided by Mohammad, but all in degrees. Often lat/lon are in degrees, so this nearly identical code my be easier to use.
function [latMid, lonMid] = midpointLatLon(lat1, lon1, lat2, lon2)
% midpoint of two lat long cord on a sphere, all units are deg
Bx = cosd(lat2) * cosd(lon2-lon1);
By = cosd(lat2) * sind(lon2-lon1);
latMid = atan2d(sind(lat1) + sind(lat2), ...
sqrt( (cosd(lat1)+Bx)*(cosd(lat1)+Bx) + By*By ) );
lonMid = lon1 + atan2d(By, cosd(lat1) + Bx);
Weitere Antworten (1)
Ted Shultz
am 20 Aug. 2019
There is a built in function in the matlab mapping toolbox that does what I think you are looking for: meanm
Mean location of geographic coordinates
Syntax
[latmean,lonmean] = meanm(lat,lon)
[latmean,lonmean] = meanm(lat,lon,units)
[latmean,lonmean] = meanm(lat,lon,ellipsoid)
0 Kommentare
Siehe auch
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!