Geolocation SQL query not finding exact location

Question

I have been testing my geolocation query for some time now and I haven\'t found any issues with it until now.

I am trying to search for all cities within a given ra

Answer 1

In your first query, I believe you've inverted the longitudes in the subtraction. The Spherical Law of Cosines is:

d = acos(sin(lat1)*sin(lat2) + cos(lat1)*cos(lat2)*cos(long2−long1))*R

If lat1 is substituted with tblcity.latitude, long1 must be substituted with tblcity.longitude. I think you've accidentally substituted long2 in your query. Does this one work better?

SELECT tblcity.city, tblcity.latitude, tblcity.longitude, 
truncate((degrees(acos( sin(radians(tblcity.latitude)) 
* sin(radians(45.266708)) 
+ cos(radians(tblcity.latitude)) 
* cos(radians(45.266708)) 
* cos(radians(-73.616257 - tblcity.longitude) ) ) ) 
* 69.09*1.6),1) as distance 
FROM tblcity HAVING distance < 10 ORDER BY distance desc 

I haven't looked into your second query yet, but hopefully that helps.