Figure 1.
The number of satellites and dilution of position measurements (PDOP and HDOP) for
September 25, 2007, at a central location in urban Halifax, Nova Scotia. DOP values
of less than 2 are more desirable.
Rainham et al. International Journal of Health Geographics 2008 7:59 doi:10.1186/1476-072X-7-59
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