TY - JOUR A1 - Gu, Y. A1 - Kraak, M.-J. A1 - Engelhardt, Y. T1 - Revisiting flow maps: a classification and a 3D alternative to visual clutter JO - Proc. Int. Cartogr. Assoc. J1 - ICA-Proc VL - 1 SP - 51 EP - Y1 - 2018/05/16 PB - Copernicus Publications SN - 2570-2092 UR - https://ica-proc.copernicus.org/articles/1/51/2018/ L1 - https://ica-proc.copernicus.org/articles/1/51/2018/ica-proc-1-51-2018.pdf DO - 10.5194/ica-proc-1-51-2018 ER -