1.) identification and mapping of all market stall locations using Global Positioning System (GPS) coordinates;  2.) using female market vendor stall GPS coordinates to build the sampling frame using replicates; and  3.) using maps and GPS data for recruitment of study participants.


 The location of 6,390 vendor stalls were mapped using GPS. 
GPS
1.) identification and mapping of all market stall locations using Global Positioning System (GPS) coordinates; 
Global Positioning System