Table 3 |
||||||||||||||||
|
Resolution estimates of four GPS instruments derived from four transportation modes in three built environment types |
||||||||||||||||
|
Walking Tests |
||||||||||||||||
|
Fraction of points within each buffer (%) |
||||||||||||||||
|
Mixed Density |
Open Sky |
Urban Canyon |
||||||||||||||
|
|
||||||||||||||||
|
GPS ID |
N |
Sats HDOP |
PDOP |
N |
± 5 m |
± 3.5 m |
± 2 m |
N |
± 5 m |
± 3.5 m |
± 2 m |
N |
± 5 m |
± 3.5 m |
± 2 m |
|
|
|
||||||||||||||||
|
6 |
824 |
8.9 |
1.47 |
3.08 |
419 |
91.4 |
78.5 |
53.0 |
189 |
100.0 |
98.9 |
85.7 |
216 |
71.3 |
64.8 |
52.8 |
|
14 |
821 |
8.6 |
1.96 |
2.70 |
412 |
52.4 |
40.8 |
27.4 |
203 |
95.1 |
82.8 |
53.2 |
206 |
43.2 |
35.9 |
20.9 |
|
15 |
702 |
9.9 |
1.43 |
2.87 |
355 |
84.5 |
73.0 |
53.8 |
167 |
98.8 |
97.6 |
87.4 |
180 |
62.2 |
56.1 |
43.3 |
|
23 |
826 |
9.1 |
1.51 |
3.02 |
418 |
87.1 |
80.1 |
61.5 |
189 |
98.9 |
94.2 |
81.0 |
219 |
61.2 |
56.6 |
41.1 |
|
|
||||||||||||||||
|
Mean |
800 |
9.2 |
1.68 |
2.88 |
403 |
74.5 |
63.2 |
44.5 |
190 |
96.9 |
90.8 |
72.0 |
206 |
57.0 |
49.2 |
35.0 |
|
|
||||||||||||||||
|
Bicycle Tests |
||||||||||||||||
|
6 |
294 |
8.7 |
1.58 |
2.61 |
140 |
90.0 |
74.3 |
47.9 |
81 |
100.0 |
97.5 |
76.5 |
73 |
50.7 |
34.2 |
16.4 |
|
14 |
297 |
9.1 |
1.52 |
2.49 |
141 |
73.8 |
58.2 |
38.3 |
80 |
98.8 |
97.5 |
87.5 |
76 |
53.9 |
43.4 |
30.3 |
|
15 |
296 |
8.2 |
1.61 |
2.66 |
135 |
78.5 |
65.9 |
41.5 |
81 |
98.8 |
91.4 |
64.2 |
76 |
60.5 |
42.1 |
25.0 |
|
23 |
293 |
8.4 |
1.55 |
2.53 |
139 |
82.0 |
61.2 |
38.1 |
82 |
98.8 |
90.2 |
70.7 |
72 |
50.0 |
41.6 |
20.8 |
|
|
||||||||||||||||
|
Mean |
295 |
8.6 |
1.57 |
2.57 |
138 |
81.0 |
64.9 |
41.4 |
81 |
99.1 |
94.1 |
74.7 |
74 |
53.7 |
40.3 |
23.1 |
|
|
||||||||||||||||
|
Automobile Tests |
||||||||||||||||
|
6 |
454 |
10.1 |
1.28 |
2.69 |
296 |
94.3 |
87.5 |
69.6 |
63 |
92.1 |
76.2 |
49.2 |
95 |
83.2 |
69.5 |
60.0 |
|
14 |
454 |
9.9 |
1.27 |
2.65 |
296 |
94.9 |
83.1 |
63.9 |
63 |
92.1 |
82.5 |
55.6 |
95 |
84.2 |
72.6 |
53.7 |
|
15 |
452 |
10.1 |
1.25 |
2.56 |
294 |
78.6 |
70.1 |
51.7 |
63 |
92.1 |
82.5 |
61.9 |
95 |
77.9 |
75.8 |
58.9 |
|
23 |
454 |
10.1 |
1.25 |
2.59 |
296 |
88.2 |
80.1 |
56.4 |
63 |
92.1 |
81.0 |
57.1 |
95 |
85.3 |
74.7 |
54.7 |
|
|
||||||||||||||||
|
Mean |
454 |
10.0 |
1.26 |
2.62 |
295 |
89.0 |
80.2 |
60.4 |
63 |
92.1 |
80.5 |
55.9 |
95 |
82.6 |
73.1 |
56.8 |
|
|
||||||||||||||||
|
Transit Bus Tests |
||||||||||||||||
|
6 |
1076 |
9.7 |
1.45 |
2.46 |
827 |
72.8 |
58.4 |
37.2 |
249 |
73.1 |
57.0 |
36.1 |
||||
|
14 |
885 |
8.8 |
1.52 |
2.57 |
618 |
60.0 |
43.9 |
23.3 |
267 |
64.4 |
50.2 |
27.3 |
||||
|
15 |
767 |
7.5 |
1.31 |
2.16 |
552 |
69.4 |
55.1 |
36.2 |
215 |
61.9 |
47.4 |
31.2 |
||||
|
23 |
929 |
7.2 |
1.34 |
2.24 |
725 |
70.5 |
55.3 |
37.2 |
204 |
62.3 |
44.6 |
27.0 |
||||
|
|
||||||||||||||||
|
Mean |
918 |
8.3 |
1.41 |
2.37 |
680 |
65.0 |
50.3 |
31.6 |
237 |
60.2 |
45.8 |
28.1 |
||||
|
|
||||||||||||||||
|
Rainham et al. International Journal of Health Geographics 2008 7:59 doi:10.1186/1476-072X-7-59 |
||||||||||||||||
