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Table 1 Comparison of positional errorsa (in meter) of addresses located by two automatic geocoding methods

From: Accuracy of two geocoding methods for geographic information system-based exposure assessment in epidemiological studies

Method of geocoding Level of accuracy (accuracy code) N addresses (%) Median distance to the reference method location (IQR) in meters Min-max, in meters Distance in meters, N adresses (%)
[0–25] [26–50] [51–100] [101–400] [401–800] >800
Method Ab (Batch Geocoder) Not found (0) 8 (0.4) 5919.5 (815.4–5639076.5) 117.7–5679417.1 2 (25.0) 6 (75.0)
City (4) or Postal code (5) 405 (18.2) 108.2 (0.0–787.3) 0.0–35204.7 160 (39.5) 13 (3.2) 26 (6.4) 60 (14.8) 48 (11.9) 98 (24.2)
Street segment (6) 363 (16.3) 0.0 (0.0–108.1) 0.0–519630.8 226 (62.3) 18 (5.0) 25 (6.9) 41 (11.3) 10 (2.8) 43 (11.8)
Address (8) or Point of interest (9) 1448 (65.1) 0.0 (0.0–0.0) 0.0–292249.4 1241 (85.7) 58 (4.0) 66 (4.6) 56 (3.9) 7 (0.5) 20 (1.4)
Total 2224 (100.0) 0.0 (0.0–37.2) 0.0–5679417.1 1627 (73.2) 89 (4.0) 117 (5.3) 159 (7.1) 65 (2.9) 167 (7.5)
Method B (ArcGis Locator) Postal code (6) or Town Hall (5) 377 (15.5) 788.9 (114.0–1845.1) 0.3–8545.1 53 (14.1) 11 (2.9) 25 (6.6) 44 (11.7) 56 (14.9) 188 (49.9)
Locality (4) or Street segment (3) 558 (23.0) 110.3 (26.7–320.6) 0.0–14477.6 132 (23.7) 55 (9.9) 82 (14.7) 174 (31.2) 47 (8.4) 68 (12.2)
Interpolated address (2) or Address (1) 1490 (61.4) 12.5 (6.0–35.6) 0.0–3951.9 1000 (67.1) 237 (15.9) 133 (8.9) 100 (6.7) 5 (0.3) 15 (1.0)
Total 2425 (100.0) 26.5 (8.0–134.8) 0.0–14477.6 1185 (48.9) 303 (12.5) 240 (9.9) 318 (13.1) 108 (4.5) 271 (11.2)
  1. apositional error was determined by calculating Euclide an distance (in meter) between addresses located by each automatic method (method A and method B) of geocoding regarding to a reference method (method R)
  2. bthe administrative division of territories in France did not allow obtaining addresses geocoded to district and state levels (level 2), county (level 3) and intersection of streets (level 7). No addresses have been geocoded to the country level