Patent ID: 7536254

Claim:
A traffic information estimating system, comprising: a past information database for storing past information, which is collected with respect to any road links in a predetermined area; a current information database for storing current traffic information with respect to any road links in the predetermined area; base calculating means for calculating a plurality of bases each of which is correlation information for approximating traffic information of each of the road links in the predetermined area by a linear sum using a plurality of the correlation information among the road links based on the past information stored in the past information database, by using a principal component analysis with missing data; a weighting coefficient calculating means for calculating a weighting coefficients of each of the bases for approximating the current traffic information which is stored in the current information database by linear sum of the bases; and a traffic information estimating means for calculating the estimated traffic information for a link where the current traffic information is lacking based on the bases calculated by the base calculating means and the weighting coefficient.