latitude-longitude

Given a set of latitude and longitude points, how can I calculate the latitude and longitude of the center point of that set (aka a point that would center a view on all points)? EDIT: Python solution I've used: Convert lat/lon (must be in radians) to Cartesian coordinates for each location. X = cos(lat) * cos(lon) Y = cos(lat) * sin(lon) Z = sin(lat) Compute average x, y and z coordinates. x = (x1 + x2 + ... + xn) / n y = (y1 + y2 + ... + yn) / n z = (z1 + z2 + ... + zn) / n Convert average x, y, z coordinate to latitude and longitude. Lon = atan2(y, x) Hyp = sqrt(x * x + y * y) Lat = atan2(z

Is there a fast way to convert latitude and longitude coordinates to State codes in R? I've been using the zipcode package as a look up table but it's too slow when I'm querying lots of lat/long values If not in R is there any way to do this using google geocoder or any other type of fast querying service? Thanks! Here is a function that takes a data.frame of lat-longs within the lower 48 states, and for each point, returns the state in which it is located. Most of the function simply prepares the SpatialPoints and SpatialPolygons objects needed by the over() function in the sp package, which

Does anyone know of a way, in Java, to convert an earth surface position from lat, lon to UTM (say in WGS84)? I'm currently looking at Geotools but unfortunately the solution is not obvious. No Library, No Nothing. Copy This! Using These Two Classes , You can Convert Degree(latitude/longitude) to UTM and Vice Versa! private class Deg2UTM { double Easting; double Northing; int Zone; char Letter; private Deg2UTM(double Lat,double Lon) { Zone= (int) Math.floor(Lon/6+31); if (Lat<-72) Letter='C'; else if (Lat<-64) Letter='D'; else if (Lat<-56) Letter='E'; else if (Lat<-48) Letter='F'; else if (Lat

How long can latitude and longitude be? I am getting very long lengths sent by a Windows Phone device: Latitude=-63572375290155 Longitude=106744840359415 This is exceeding my table column size and I am getting errors. The valid range of latitude in degrees is -90 and +90 for the southern and northern hemisphere respectively. Longitude is in the range -180 and +180 specifying coordinates west and east of the Prime Meridian, respectively. For reference, the Equator has a latitude of 0°, the North pole has a latitude of 90° north (written 90° N or +90°), and the South pole has a latitude of -90°.