[postgis-users] PostGIS Capabilities

[Tyler Mitchell]

> I agree with you opinion. However, the bridge data (point shape file) is 

> created based on the highway data.  The highway data has LRS (linear 
> referencing system) to locate the point (or event) on the highway.  The 
> bridge data is created via LRS.  Therefore, it should be exactly on the 
> highway. 

I hadn't considered this possibility in my tirade last night. Interesting.

> the precision of the coordinates might be changed when I converted 
> shapefile to PostGIS db table.

It'd be interesting to compare the precision of the coordinates.

> Actually, ArcGIS give you the option field about buffer distance.  I 
> used 0 value for the buffer distance.  And, in ArcGIS, even if I zoom in 

> as far as possible, the points (bridge) are on the line. 

For academia sake, I wonder what you'd see if you export from postgis back 
into shape and compare the precise locations in ArcMap.

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