I have a country filter and city filter, when use country filter, it shows all the cities in that cntry on a map;when use city filter, it only shows one city, what if i want to click a city and show all its nearby cities instead?
found this tutorial on radius filter based on office and customers but couldn't figure out how to apply it:http://kb.tableausoftware.com/articles/knowledgebase/radius-filters
in its formula
3959 * ACOS(SIN(RADIANS([Lat])) * SIN(RADIANS([Offices$_Lat]))+COS(RADIANS([Lat])) * COS(RADIANS([Offices$_Lat])) *COS(RADIANS([Offices$_Long]) - RADIANS([Long])))
it uses Offices$_Lat, but on my map, it's just lat&lon of different cities, how to modify this formula? and do i need to write some custom SQL code?
Thanks a lot in advance!
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