The Impact of Data Aggregation on Potential Accessibility Values - Geoinformatics for Intelligent Transportation - page 227

express road in the north-eastern environs of Warsaw and a motorway bypass of
Minsk Mazowiecki 50 km to the east of Warsaw (Fig. 1 ).
Comparisons of potential accessibility values resulting from the individual
models are presented in Fig. 2 . The differences reach a maximum of almost 50 %
and mostly affect the environs of Warsaw, which is a direct consequence of the
“ of mass from the city centre (in the M1 model) towards peripheral, res-

idential districts with high population densities (Fig. 2 a). As a result, the distance to
the highly populated districts of Warsaw from suburban municipalities is smaller
and the accessibility values in the M2 model are higher. Moreover, there is a clear
positive correlation between increasing distance from Warsaw and diminishing
differences in Ai values. The differences are also more visible where accessibility

sprawl ”

Fig. 2 Differences in potential accessibility values. a Ai(M2) − Ai(M1), b Ai(M3) − Ai(M1), c Ai

(M2) − Ai(M3)