street level shape files for united state

[Joseph Bussell]

The tiger line files lack geo-correctness as well as network 
connectivity.  All roads are flattened in the tiger data (no overpass or 
underpass data).  Its hard to run a routing application using that data 
as you end up taking right turns off highways into the subburbs.  
Ultimately, you get what you pay for.  The documentation is decieving 
though, as it suggests that an elevation code is in the data.  Trouble 
is that the column in unpopulated.  According to the folks who are 
supporting tiger, the data field is present, but its up to the local 
authorities to populate the values.  As near as I can tell no one has 
any funding to do that work.

my $0.02

Joe Bussell
On Time Systems


K Kuo wrote:

> Hi,
> I have been looking for the detail road network (street level) shape 
> files for US and can not find it. I am wondering if there is any free 
> data available. Is the commercial street level data like (navteq) much 
> better than tiger files (if I convert tiger file to shapefile)?
> thanks
>
> Kurt
>