code: func HasZoomParameter(queryString string) bool {
  	qs := strings.TrimSpace(queryString)
  	if !strings.HasPrefix(qs, "q=") {
  		return false
  	}
  	qs = strings.TrimPrefix(qs, "q=")
  	fields := strings.Fields(qs)
  	for _, v := range fields {
  		if geo.IsLocMapPredicate(v) {
  			return true
  		}
  	}
  	return false
  }
docs: // HasZoomParameter returns whether queryString is the "q" parameter of a search
  // query, and whether that parameter contains a map zoom (map predicate).