for this you have to find key of that value first then you can unset that key from array.
you can get latitude and longitude by using google map api
you can do this easily by using java script function
(1)got to your bin directory from command prompt cd C:xamppmysqlbin (2)Now use following command mysqldump -u username -p yourdbname > mysqlfilename.sql
(1)go to admin panel http://yoursite.com/wp-admin (2)go to Setting-> General Setting (3)Select “Anyone can register” option (4)saved settings