earthdistance

I'm using Postgresql 9.3 and iv'e installed cube and earthdistance extensions. I'm trying to follow this tutorial , so i have a simple events table with 4 fields: id, name, lat, lng. Now i'm trying to run this query, to get all events within 1 km radius: SELECT events.id, events.name FROM events WHERE earth_box(31.789225, 34.789612, 1000) @> ll_to_earth(events.lat, events.lng); but i keep getting this error: 20:59:34 Kernel error: ERROR: function earth_box(numeric, numeric, integer) does not exist HINT: No function matches the given name and argument types. You might need to add explicit type

I am studying pArk Apple sample code, and how it is works. anyone knows how convert the latitude and longitude to ECEF coordinates, and Covert ECEF to ENU coordinates centered at given lat, lon functions are work? I just want to understand what is going on in this function! thanks. void latLonToEcef(double lat, double lon, double alt, double *x, double *y, double *z) { double clat = cos(lat * DEGREES_TO_RADIANS); double slat = sin(lat * DEGREES_TO_RADIANS); double clon = cos(lon * DEGREES_TO_RADIANS); double slon = sin(lon * DEGREES_TO_RADIANS); double N = WGS84_A / sqrt(1.0 - WGS84_E * WGS84

Since I'm new to opencv, I don't know how to use the cv.CalcEMD2 function with numpy arrays. I have two arrays: a=[1,2,3,4,5] b=[1,2,3,4] How can I transfer numpy array to CVhistogram and from Cvhistogram to the function parameter signature ? I would like anyone who answers the question to explain any used opencv functions through the provided solution. "EMD" == earth mover's distance . Update:- also ,It will be helpful if anyone can tell me how to set the cv.CalcEMD2 parameter i.e "signature" using numpy array!! Note:- * For those who may be interested in this question ,This answer needs more