A first approach, for analyses conducted at the individual level,
is to correct measures of multiplace environmental exposures.
Theoretically, it is relevant to determine spatial accessibility to
resources from so-called anchor points (Chaix et al., 2012c;
Flamm and Kaufmann, 2006; Kestens et al., 2010a), i.e., places
with important material and symbolic meaning for the individuals,
around which they organize their daily activities, and/or
where they are relatively constrained to go