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. 2007 Mar 16;6:12. doi: 10.1186/1476-072X-6-12

Table 4.

Supplemental geocoding results using satellite images

Original geocoding result Single-stage only Multi-stage only Both methods
Number selected 40 372 1000 (a random sample)
Number (%) matched by Google Earth Pro 24 (60) 233 (63) 962 (96)
Distance to single-stage geocoded location, meters
 10th percentile 17 . 10
 25th percentile 57 . 19
 50th percentile (median) 172 . 38
 75th percentile 871 . 83
 90th percentile 3402 . 162
 Proportion > 1000, % 25.0 . 1.5
Distance to multi-stage geocoded location, meters
 10th percentile . 6 6
 25th percentile . 8 11
 50th percentile (median) . 30 32
 75th percentile . 67 65
 90th percentile . 153 125
 Proportion > 1000, % . 3.9 1.8