A Survey done through comprehensive tool such as ESS Pro 10, The tool takes into account information such as area, capacity ( number of devices), applications, type of walls and pillars and type of Access Points. Predictive survey are very cost effective and quicker than traditional onsite surveys.
We have used predictive site surveys to successfully deploy APs at: Offices, Educational Institutes, Hospitals, Hotels and Manufacturing units. Predictive site surveys are very accurate.
For latency sensitive applications, onsite survey is a preferred option.