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{de Sousa}, L., F. Nery, R. Sousa, and J. Matos. "Assessing the accuracy of hexagonal versus square tiled grids in preserving DEM surface flow directions}." In Proceedings of the 7th International Symposium on Spatial Accuracy Assessment in Natural Resources and Environmental Sciences (Accuracy 2006), edited by M. Caetano and M. Painho, 191-200. Lisbon: Instituto Geográphico Português, 2006.