Spatial LRS

Question

Hi,
I am new to Oracle Spatial and Linear Referencing System. I checked with the user guide, and found very limited functions available such as: define, clip, split, concatenate, scale a geometric segment, locate a point on a geometric segment etc.
My question is whether or not LRS supports additional analysis functionality such as event overlay?
Here is an example: one route is from 0 to 100 miles; from 20 to 50 miles is a pavement road, from 30 to 80 miles has high traffic accidents. Can we retrieve road (from where to where mile post information) that is pavement and has high traffic accidents?
A SQL statement might be:
select * from route table where event = 'pavement' and event = 'high traffic accidents'.
Thanks a lot.
Feng Lu
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Answer 1

Hi Feng Lu,
This might require more than one table.
For instance, you might have a table called roads that includes lrs information as well as attribute data (road name, etc) and a key that other tables can join on.
To do what you are trying to do, you might have additional tables, such as an accidents table that contains an entry for every accident, with information such as where the accident happened as a measure value only, a pointer using the key back to the road the accident happened on, and perhaps other information such as accident cause, etc.
Another additional table you might have is a road_condition table, with information about road condition such as: condition, start measure for that condition, end measure for that condition, when the last time the road was inspected, and a key back to the roads data.
The you could query the database getting whatever information is required from the three tables.
Hope this helps,
dan