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Most traditional metrics compare origin-destination (OD) matrices based on the deviations of individual OD flows and often neglect OD matrix structural information within their formulations. Limited metrics exist in literature for the structural comparison of OD matrices. One such metric is mean structural similarity index (MSSIM) that computes statistics on groups of OD pairs defined by local sliding windows. However, MSSIM can result in different values based on the choice of the size of the window. In literature, no clear consensus has been reported on the level of acceptability of the window size and the resulting MSSIM values. Addressing this need, we propose the concept of geographical window, and develop geographical window based structural similarity index (GSSI) that exploits OD matrix structure by computing statistics on the group of OD pairs that are geographically correlated. Compared to traditional …