Advances in Fuzzy Systems

Research Article

A Geometric Fuzzy-Based Approach for Airport Clustering

Table 6

Clustering results without prefixing the number of clusters. Criterion: yearly movements.


Metrics	ED	FHD	KD

Cluster 1 (centre: Roma FCO)
≤20%	30, 19, 18, 36	30, 19, 18, 36	30, 19, 18, 36
20%–40%	4, 10, 20, 29, 5, 22	4, 10, 20, 29, 5, 22	4, 10, 20, 29, 5, 22
>40%	26, 9, 37, 32, 3, 34, 21, 13, 17, 1, 16, 8, 35, 33, 15, 2, 27, 28, 25, 23, 7, 12, 24, 6, 14, 11, 38, 31	26, 9, 37, 32, 3, 34, 21, 13, 17, 1, 16, 8, 35, 33, 15, 2, 27, 28, 25, 23, 7, 12, 24, 6, 14, 38, 11, 31	26, 9, 37, 32, 3, 34, 21, 13, 17, 1, 16, 8, 35, 33, 15, 2, 27, 28, 25, 23, 7, 12, 24, 6, 14, 38, 11, 31

Cluster 2 (centre: Torino)
≤20%	32, 3, 37	32, 3, 37	32, 3, 37
20%–40%	20, 10, 36, 9, 34, 4	20, 10, 36, 9, 34	20, 10, 36, 9, 34
>40%	1, 26, 19, 30, 18, 29, 22, 5, 17, 8, 33, 15, 13, 16, 27, 14, 16, 12, 7, 11, 25, 35, 31, 38, 28, 2, 23, 24, 6	4, 1, 26, 19, 18, 30, 29, 22, 5, 17, 8, 33, 15, 13, 16, 27, 14, 16, 12, 7, 11, 25, 35, 31, 38, 28, 2, 23, 6, 24	4, 1, 26, 19, 18, 30, 29, 22, 5, 17, 8, 33, 15, 13, 16, 14, 27, 16, 12, 7, 11, 25, 35, 31, 38, 28, 2, 23, 6, 24

Cluster 3 (centre: Lamezia Terme)
≤20%	17, 8, 34	17, 8, 34	17, 8, 34
20%–40%	33, 9, 15, 26, 22, 1, 29	33, 9, 15, 26, 22, 1, 29	33, 9, 15, 26, 22, 1, 29
>40%	21, 37, 3, 5, 20, 32, 10, 4, 14, 27, 36, 17, 30, 18, 19, 7, 13, 12, 11, 25, 16, 31, 38, 35, 28, 23, 2, 6, 34	21, 37, 3, 5, 20, 32, 10, 4, 14, 27, 36, 17, 30, 18, 19, 7, 13, 12, 11, 25, 16, 38, 31, 35, 28, 23, 6, 2, 34	21, 37, 5, 3, 20, 32, 10, 4, 14, 27, 36, 17, 30, 18, 19, 7, 13, 12, 11, 25, 16, 38, 31, 35, 28, 23, 2, 6, 34

Cluster 4 (centre: Pescara)
≤20%	25	25	25
20%–40%	7, 27, 38, 12, 31	7, 27, 38, 12, 31	7, 27, 38, 12, 31
>40%	28, 16, 11, 23, 13, 6, 14, 15, 24, 2, 33, 35, 8, 17, 5, 22, 26, 34, 9, 29, 1, 20, 37, 21, 4, 3, 32, 10, 18, 30, 36, 19	28, 16, 11, 13, 23, 6, 14, 15, 24, 2, 33, 35, 8, 17, 5, 22, 26, 9, 34, 29, 1, 20, 37, 21, 4, 3, 32, 10, 18, 30, 19, 36	28, 16, 11, 13, 23, 6, 14, 15, 24, 2, 33, 35, 8, 17, 5, 22, 26, 9, 34, 29, 1, 20, 37, 21, 4, 3, 32, 10, 30, 18, 19, 36

Cluster 5 (centre: Crotone)
≤20%	11	11	11
20%–40%	32, 14, 31, 7, 27, 15	32, 14, 31, 7, 27, 15	32, 14, 31, 7, 27, 15
>40%	38, 25, 33, 8, 17, 16, 28, 13, 23, 6, 24, 2, 34, 35, 26, 1, 22, 9, 5, 29, 21, 37, 20, 3, 32, 4, 10, 18, 36, 30, 19	38, 25, 8, 33, 17, 16, 28, 13, 23, 6, 24, 2, 34, 35, 26, 22, 1, 9, 5, 29, 21, 37, 20, 3, 32, 4, 10, 18, 36, 19, 30	38, 25, 8, 33, 17, 16, 28, 13, 23, 6, 24, 2, 34, 35, 26, 22, 1, 9, 29, 5, 21, 37, 20, 3, 4, 32, 10, 18, 36, 19, 30