Erratum

This article refers to:

Alternating scanning orders and combining algorithms to improve the efficiency of flow accumulation calculation

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:

$\mathrm{\Theta }(N\times k)\approx \mathrm{\Theta }(bN\mathrm{l}\mathrm{o}\mathrm{g}N)$

This has now been corrected in the online version eliminating the extra component, √a² + b².

Taylor & Francis apologises for this error.