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Where to start with Linear Referencing?

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08-24-2012 08:36 AM
ThomasColson
MVP Alum
I realize this is a newbie quetion, but....we recently collected event data for 200 miles of roads on an 800000 ac campus. Included is very dense distance data measured with a digitally calibrated wheel, features (signs, culverts, rails), and 30,000 mile-points. I am somewhat overwhelmed by the plethora of transportation data models and Online documentation, which seems more targeted for municipal tranportation (we're in the sticks here!). What would be a good ESRI resource I can start with, where I can trim out all of the "bling" except for lines, routes, and events? One issue is that while no expense was spared on accurately measuring distance, apparantly we got a discount on the GPS attached to the wheel. We pulled centerlines from 6 in air photo, but the event points matched to the event measurements range from 1 ft to 20 ft from the road centerline. With snapping, this shouldn't be much of an issue except at the start and end points of each road segment, where this is a horizontal shift left or right, as well as a linear shift either a few feet before the segment start, or a few feet after it starts. What would be the best way to correct this (as best as possible without manually shifting 30,000 points). Thanks for any direction.
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BrianYoung1
Deactivated User
Not sure if this is helpful.  You should be able to snap your mile points to your center lines like you said.  I would give the center lines estimated mile points (Start/End) and create a route in the Linear Referencing ToolBox.  Then used the snapped mile points and center lines to Calibrate the Route under the Linear Referencing ToolBox.  Your center line mile points (M Values) would then match the ones you collected.  You can then dynseg all your signs and rail crossings to your center lines.
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