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| Subject: | GISList: SUM: Street Addresses |
| Date: |
02/13/2002 07:37:18 AM |
| From: |
Craig von Hagen |
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HI,
Thanks to Jan for his response
Original question
Does anybody have experience in the above in places other than the USA
where the address formats are sometimes different and street data is not of
the best quality?
Answers
I did some work on this back home in Norway in 1999. I just had to dig up my
report first before I could answer you.
Let me tell you how things work in Norway, or better said, worked, since
they may have changed over the past 3 years:
What I did was to develop a routing application that linked an MS Access
database of visiting nurses' clients to ArcView Network Analyst (AVNA).
Here's how it ended up:
All streets need to have a name or a unique identifier. All public access
roads in Norway have a name, and even most private roads, so that part was
covered. Then, every house/building in Norway is spatially referenced,
usually by building or lot centroid, and also by referenced by address.
Given the street names ( A Street), the buildings address (## A street) and
the spatial co-ordinates (address point) of the building it was fairly easy
to make the routing work. However, the routing algorithm in AVNA always
sought to route the path on the road nearest to the particular address point
(spatial join), which in some case was not it's real address road. Example:
a house with address on street A is spatially closer to street B, thus
street B will be chosen for the path, and may lead to wrong results. The
only way to solve this is to manually move the address point so that it is
closest to its address road.
House numbering is consecutive in Norway: 1, 3, 5, 7...odd numbers to the
left, and 2, 4, 6, 8 ...even numbers to the right. Consequently you have to
know the number range from along any particular arc to do routing without
the address point as identifier, but with the address point this is not
necessary. There are standards for rural areas as to how many house numbers
per kilometer, something on the order of 100 numbers per kilometer. Thus,
linear referencing will produce an approximate result, although I never
tried that.
Jan Husdal
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