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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