Modern phones support an "Enhanced 9-1-1" capability, GPS data will automatically be sent to emergency services when you dial 9-1-1 or similar emergency numbers

Modern phones support an "Enhanced 9-1-1" capability, GPS data will automatically be sent to emergency services when you dial 9-1-1 or similar emergency numbers. Would it be possible to do a reverse 9-1-1 call and then pull the E-GPS data en-masse to measure water levels?