[Talk-us] Adding Tiger 2011 Data

Toby Murray toby.murray at gmail.com
Thu Mar 1 03:11:00 GMT 2012

I pulled up this area in JOSM:

Something definitely went wrong here that you need to figure out and fix.

1) A lot of the ways are not connected to each other. This means they
are not usable for routing. In JOSM junction nodes show up as bigger
squares. One should exist anywhere one road intersects another. Just
having a node at the same location so it looks connected is not
enough. You need to merge the two nodes into one junction node.

2) there are duplicate nodes. These are what is creating the red
circles in P2. Somehow you duplicated most of the nodes in the area.
Once, they are there as the member of a way. Then there is a second
copy in the exact same location but it is not a member of any way,
just an empty node.

3) Some of the ways are over-noded. For example, North Orangetip Drive
is a short, straight street. It only needs 3 nodes to represent it.
One at the south end, one where it connects to West Leafwing Drive and
one where it connects to West Greenstreak Drive. But you imported it
with 29 nodes. The same goes for several roads right around it.

Imports are hard to get right.


On Wed, Feb 29, 2012 at 8:40 PM, Clifford Snow <clifford at snowandsnow.us> wrote:
> On Wed, Feb 29, 2012 at 6:06 PM, Josh Doe <josh at joshdoe.com> wrote:
>> Please don't any more for a bit. Share with the list your recent
>> changesets, and the scripts you are using to convert the files. Also see the
>> manual conflation article on the wiki for my process. I can send a link when
>> I'm at a desktop.
> I'm not using scripts.  It is all manual cut and past as described in the
> manual conflation wiki article.  After copying the tiger data, the new way
> needs to be assigned the appropriate highway type, in my case it is all
> residential.  Then the name needs to be added.  Copying in the tiger data
> gives a Key value of FULLNAME.  The FULLNAME is copied into a name key.
>  With the street names in this area of Tucson, the direction, i.e. N is
> expanded and the suffix, ln, dr, pl, etc. also need expanding.   As you
> mention in the wiki, the new ways need to be connected to the existing ways.
> Examples of the nodes as they appear in Potlatch2 can be seen in my google+
> photo album.
> Clifford
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