[postgis-users] Postgis linear referencing
carl.anderson at vadose.org
Wed Mar 10 20:36:11 PST 2004
On 03/09/2004 05:17:21 PM, Christoph Spoerri wrote:
> I don't know much about the internal of geocoding and never really
> used with
> the exception of mapquest ;), but the system you describe sounds more
> like a
> geocoding system. Something that PostGIS could use as well and (in my
> opinion) seems harder to implement than a LR system.
> Please let me know if I'm wrong here,
I have some very specific ideas about LR systems, that may not always
be in concert with the current industry wisdom.
The common uses of a LR System is to
generate and show line segments created dynamically from
the roads network.
create points representing features along the LR System
allow the user to retrieve the LR distance from a point along
so the first element might be a
(grass cutting | paving | speed limit | street address ) list and
look a little like
On from to
Wilson Rd Jailette Rd Terry Way 50km/h
Wilson Rd 500m before Porter Ln 500m after Sunset Ct 40km/h
Wilson Rd 6997 Wilson Rd Johns Pkwy 60km/h
Wilson Rd Km Post 5.25 Km Post 2.55 90Km/h
so Street name matching is definately a part of the tools
as is relating Intersections to LR offsets (system length)
as is correlating street addresses to a Mile/Km Post measure
as is correlating before and after relationship to system
directions and intersections
We are well on our way to this goal, but co-venturers are welcome
There is a North Carolina DOT System Inventory (of roads) that you,
at Duke Univ, could lay our hands on. building a suite of tools that
can process that list, is part of what I would consider LRS support.
BTW you correctly see street addresses as a complex form of a LRS,
not the most complex I can think of BTW. because people can relate
to Street Addresses in a natural and intuitve way, not including
support for them would leave tools wanting.
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