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Nevertheless, a spherical or ellipsoidal surface can be defined by two coordinates, call them x/y or longitude/latitude as you wish. Begin at a given point on the surface, and rotate that point independently around two perpendicular axes of rotation. This yields a pair of "axes". Along one axis, x is zero. Along the other axis, y is zero.
For coordinates captured using a GPS, or by any means, longitude is the X value and latitude is the Y value. These are for a geographic coordinate system and have units of degrees. Alternatively your GPS may be set to return values for eastings and northings using a projected coordinate system with units often in meters (can be feet, etc).
I want to convert GPS location (latitude, longitude) into x,y coordinates. I found many links about this topic and applied it, but it doesn't give me the correct answer! I am following these steps to test the answer: (1) firstly, i take two positions and calculate the distance between them using maps.
the y-axis goes through (0,90); and the z-axis goes through the poles. The conversion is: x = R * cos(lat) * cos(lon) y = R * cos(lat) * sin(lon) z = R *sin(lat) Where R is the approximate radius of earth (e.g. 6371 km). If your trigonometric functions expect radians (which they probably do), you will need to convert your longitude and latitude ...
When you google "latitude/longitude" you get 10 times more results than "longitude/latitude". This I find very confusing as "x/y" seems 20 times more common than "y/x". But on a map Latitude is on the Y axis and longitude on the X.
y = (total height of image in px) * (90 - longitude) / 180. note: when using negative longitude of latitude make sure to add or subtract the negative number i.e. + (-92) or - (-35) which would actually be -92 and +35. You now have your X and Y to plot on your image. More information can be found about this formula and the map type here:
After reading about the formulas to convert the longitude/latitude to X/Y coordinate, I end up with the following code:- private static final int EARTH_RADIUS = 6371; private static final double FOCAL_LENGTH = 500; ...
A second approach is to convert the longitude and latitude to (x, y, z) coordinates in 3d space. If you approximate the earth's surface as a sphere, then the formulae should be. x = cos(lat) * cos(lon) y = cos(lat) * sin(lon) z = sin(lat) where lon and lat are in radians. In this case however, z=-1 is the south pole, z=1 is the north pole, x=1 ...
The arctan2(y,x) function would output the longitude of the point if they were expressed in a polar orthographic or geocentric coordinate system, but I doubt this is the case here. My crs guess for the point would be UTM Zone 17N, but feet instead of meters. This would translate to 34.12139764, -77.89539463, near 6001 Appomattox Dr, Wilmington ...
13. Latitudes and longitudes exist on a spherical globe. Map X and Y coordinates exist on a (theoretically) flat map. To convert between them, you need to "project" the spherical coordinates onto the flat map. There are many different ways to do projections. Some are optimised for particular regions.