In this paper we propose a simple method which analyses the similarity of river networks with different spatial resolutions. We use the coordinates and upstream catchment areas at major confluent points in order to represent the features of river networks. Turning counter- clockwise around the river network from the estuary, we arrange confluent points into one string. The sets of the one-dimensional data obtained from river networks are compared by using DP matching. The method is successfully applied to the Hayakawa river (a branch of the Fujigawa river): the fine-resolution network is made from 50mDEM, and it is rescaled into coarser spatial resolutions.
