GPS World had an interesting article about the use of existing maps to correct GPS signals used to locate pedestrians.
GPS World Article "City Walk"
The basic idea is to use the existing information about road networks and 2D building footprints to correct for crappy GPS signal reception and multipath problems. I thought this was a really cool concept.
It was odd to think of correcting GPS with an existing map when surveyor's commonly create the map with GPS. It presents a sort of "Which came first - the chicken or the egg?" problem.
I am intrigued by the idea of using high quaility survey data to correct GPS signals. For example: You could perform a survey of building footprints in a city's downtown using conventional optical survey instruments that could then be used for highly accurate positioning of pedestrians and vehicles via recreation grade GPS receivers.
The Sunburned Surveyor
GPS World Article "City Walk"
The basic idea is to use the existing information about road networks and 2D building footprints to correct for crappy GPS signal reception and multipath problems. I thought this was a really cool concept.
It was odd to think of correcting GPS with an existing map when surveyor's commonly create the map with GPS. It presents a sort of "Which came first - the chicken or the egg?" problem.
I am intrigued by the idea of using high quaility survey data to correct GPS signals. For example: You could perform a survey of building footprints in a city's downtown using conventional optical survey instruments that could then be used for highly accurate positioning of pedestrians and vehicles via recreation grade GPS receivers.
The Sunburned Surveyor
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