For web-based surveys, Google Surveys reports on the inferred age and gender of respondents based on the websites users visit. Location is derived from the users’ IP addresses.
Please note that it's possible to miscategorize users. For example, if a household uses a shared computer, we may categorize a user based on the combined interests of the household.
Certain surveys, such as local surveys, may be used to get feedback about a location you’ve recently visited and request permission for these responses to be posted publicly.