Unexpected result from wmline command

Hello,

I want to plot a line connecting latitude and longitudes on map using wmline command. When I use the command i get and extra straight line connecting the start and end co-ordinates. How to avoid that line?

Regards,

Nachiket

Answer 1

[Walter Roberson]

That does not happen in my tests, such as

cities = shaperead('worldcities.shp', 'UseGeoCoords', true, ... 
    'Selector', ... 
    {@(v)(ismember(v, {'London', 'Paris', 'Berlin'})), 'Name'});
lat = [cities.Lat]; 
lon = [cities.Lon];
wmline(lat,lon)

That suggests that your first and last lat and lon are the same.

[Nachiket Wadwankar]

Attached is the mat file of my co-ordinates. As suggested I checked, my first and last lat-lon are different.

[Walter Roberson]

Duplicate coordinates.

I recommend plotting your latitude and longitude individually; you will see a big jump half way through.

>> [Longitude([1, end/2]),Latitude([1, end/2])]

ans =

                -90.402756                40.9385799
                -90.402756                40.9385799

[Nachiket Wadwankar]

Actually my data was incorrect.

@Walter Roberson Thank you for your response