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Table 1 Detailed results of testing each mask based on three different tiers of privacy protection

From: Street masking: a network-based geographic mask for easily protecting geoprivacy

Mask & parameters K-anonymity Displacement distance (m) Landcover agreement
Area Mask Params K-25 K-50 K-100 K-200 Avg Med Min Max % of Points
Vancouver, n = 7206 Street 10 94.4 79.7 50.5 16.2 168.8 166.9 38.0 536.3 83.4
 Dist-based donut 225 94.0 82.6 55.0 10.8 168.6 175.2 57.4 225.0 83.9
 Pop-based donut 700 94.9 85.3 52.2 8.0 174.0 160.9 30.5 2814.0 84.9
Street 20 98.6 93.7 77.5 40.7 220.7 216.6 36.7 720.8 82.7
 Dist-based donut 275 97.2 91.0 73.0 36.6 206.8 215.4 73.0 274.9 82.3
 Pop-based donut 1200 98.0 94.1 80.2 39.3 228.3 210.7 52.9 4259.6 83.0
Street 30 99.0 96.6 88.2 64.7 270.2 271.1 36.7 949.8 79.7
 Dist-based donut 350 98.6 95.6 86.3 62.3 261.9 270.8 90.5 350.0 81.6
 Pop-based donut 2000 98.9 97.0 91.2 70.7 294.3 271.3 65.2 5018.7 81.4
Surrey, n = 4614 Street 10 90.3 71.0 37.5 7.7 203.5 184.6 37.6 3946.9 90.5
 Dist-based donut 225 82.0 59.2 22.1 0.4 168.8 176.0 59.1 225.0 87.2
 Pop-based donut 500 91.9 73.7 35.2 10.4 280.4 185.3 41.9 7720.1 85.0
Street 20 97.1 89.3 68.7 30.8 279.4 255.8 44.3 3946.9 88.8
 Dist-based donut 325 92.0 81.4 57.7 21.5 244.6 253.8 83.5 325.0 85.0
 Pop-based donut 1000 96.7 90.7 70.3 30.6 398.8 263.8 55.4 11165.9 81.7
Street 30 97.7 93.6 81.6 50.1 332.7 309.1 47.2 4138.3 88.4
 Dist-based donut 375 94.1 85.4 67.6 34.7 281.5 293.7 99.5 375.0 83.7
 Pop-based donut 1500 98.1 94.5 83.4 51.5 486.4 321.8 71.2 13731.0 79.4
Kamloops, n = 2433 Street 10 93.3 80.3 51.5 22.0 230.7 198.2 34.1 3901.6 75.7
 Dist-based donut 250 87.1 71.3 39.8 3.7 186.9 195.3 64.0 250.0 73.6
 Pop-based donut 400 93.7 82.4 49.6 16.7 449.8 202.8 45.4 20145.7 66.2
Street 20 97.7 92.8 77.2 45.7 320.3 280.3 32.6 5123.9 70.9
 Dist-based donut 350 93.5 83.9 64.9 31.6 260.5 270.3 90.6 349.9 68.0
 Pop-based donut 800 97.7 92.6 79.2 45.0 637.5 288.6 63.8 27807.6 63.2
Street 30 98.7 96.2 87.7 62.9 385.7 340.6 56.3 7020.7 68.6
 Dist-based donut 425 94.8 88.4 75.2 50.3 318.4 332.4 112.2 424.9 64.2
 Pop-based donut 1100 97.7 94.7 86.4 59.7 752.9 339.5 111.8 34597.7 60.8
  1. Parameters are search depth, maximum displacement distance in meters, and maximum k-anonymity for street masking, distance-based donut geomasking, and population-based donut geomasking, respectively