You can adapt this according to your needs.
you just have to use loops to make a serires of comparations. Also you have to know how to messure the the distance using longitude and latitude.
Check if this works.
loc=360*rand(20,2)-180;
lonlat=360*rand(5,2)-180;
closest=zeros(size(lonlat,1),3);
aux=zeros(size(loc,1),1);
R=6373; %Km
for i=1:size(lonlat,1)
lon2=lonlat(i,1); lat2=lonlat(i,2);
for j=1:size(loc,1)
lon1=loc(j,1); lat1=loc(j,2);
dlon = lon2 - lon1;
dlat = lat2 - lat1 ;
a = (sin(dlat/2))^2 + cos(lat1) * cos(lat2) * (sin(dlon/2))^2;
c = 2 * atan2( sqrt(a), sqrt(1-a) ) ;
d = R * c; %where R is the radius of the Earth
aux(j)=d;
end
idx=find(aux==min(aux(:)));
closest(i,1:2)=loc(idx,:);
closest(i,3)=aux(idx);
end
I made use some random lons and lats, the algorithm to calculate the distance was taken from this site.
closest is the result matrix, which has the closest coordinate from loc for each coordinate lonlat respectively, [lon lat min(distance)]
Hope it works
