Advances in Fuzzy Systems

Research Article

A Geometric Fuzzy-Based Approach for Airport Clustering

Table 4

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


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, 26, 9	4, 10, 20, 29, 5, 22, 9, 26	4, 10, 20, 29, 5, 9, 22, 26
>40%	37, 32, 3, 34, 21, 13, 17, 1, 16, 8, 35, 33, 15, 2, 27, 25, 28, 23, 7, 12, 24, 6, 14, 11, 31, 38	37, 32, 3, 34, 21, 13, 17, 1, 16, 8, 35, 33, 15, 2, 27, 25, 28, 23, 7, 12, 24, 6, 14, 11, 38, 31	37, 32, 3, 34, 21, 13, 17, 1, 16, 8, 35, 33, 15, 27, 2, 25, 28, 23, 7, 12, 24, 6, 14, 38, 11, 31

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

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

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

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