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Shi, X. and Yao, Y., 2015. Alternating scanning orders and combining algorithms to improve the efficiency of flow accumulation calculation. International Journal of Geographical Information Science, http://dx.doi.org/10.1080/13658816.2015.1027209
When the above article was first published online, Equation (6) has an extra component, √a2 + b2, which is not present in the original manuscript. Equation (6) should only appear like this:
This has now been corrected in the online version eliminating the extra component, √a2 + b2.
Taylor & Francis apologises for this error.