site_id  replicate  lat      lon      
1        1          29.4436  -89.8998  
1        2          29.4436  -89.8998  
1        3          29.4436  -89.8998  
2        1          29.4417  -89.9013  
2        2          29.4417  -89.9013  
2        3          29.4417  -89.9013  
3        1          29.4414  -89.9026  
3        2          29.4414  -89.9026  
3        3          29.4414  -89.9026