Yeah, I knew trying to do sequential pulls would create a number of
coordination issues, I just didn't know what the plan was. I figured someone
smarter than me had figured out a cool way to do it, like keying on the
tiger_reviewed tag and automatically replacing centerline data that hadn't been
reviewed with the revised entity in TIGER. Things could still get messy where
a user has added new subdivisions features before the TIGER data release with
the official position data for those streets. You'd need some sort of way to
flag street centerlines that are too close to be reasonable, or cross, or
whatever, and somehow keep it from flagging every divided highway in the
system. Doesn't sound fun.
The idea of creating tools for users to pull thier county of interest and
compare the new TIGER with OSM might be useful. I thought I saw where Steve C
had done a comparison of OSM's centerline info with Google/NAVTEQ's info for an
area of interest in an automated way (although I could certainly be mistaken on
that point). A highlight tool for OSM vs. new TIGER for a county sized region
with arial imagery in the background would be an awesome tool to rapidly scan
for things that may have been missed...or areas where TIGER is really out of
the loop :-)
All in all I'm in awe of the data conversion process that has already taken
place. I've been playing around with the streets in my city (Stockton, CA) and
I can't imagine having a situation similar to the UK where every single street
had to be loaded by hand from scratch! Thanks Dave for the great work!
-Mike
-- Beau Gunderson [EMAIL PROTECTED] wrote:
Another alternative may be to be for the people working in an area they care
about to do those steps manually. I'm very interested in the Seattle data
because the TIGER data that's there now has some definite gaps. :)
Beau
On Sun, Jul 20, 2008 at 2:56 AM, Dave Hansen [EMAIL PROTECTED] wrote:
On Thu, 2008-07-17 at 21:10 +, [EMAIL PROTECTED] wrote:
Is the Census Bureau going to continue to make regular (ie. annual or
semi-annual) data releases of street centerline data, or does the 2007
TIGER/Line Shapefile release represent the end of the project?
I can't imagine this will be their last release. I'm sure they'll
continuei
If they plan on releasing incremental updates, is there an OSM plan in
place for pulling from their updated information each time they
release? or was the 2006 data intended to be a baseline that would
then be improved and maintained only by OSM users?
It was a real pain to import one static data set onto a blank slate. I
can't even imagine trying to:
1. Read the new features
2. Find out what those were mapped as in 2006 when we pulled the TIGER
data
3. Figure out where those features went in OSM
4. Figure out if those features have been updated
5. Which copy is better
6. Update those features in a safe manner and at a speed that would
allow us to complete by the time the next data set is out.
Seriously, I always saw TIGER as a one-time thing. If someone is really
interested in doing this, I don't want to stop them. But, as the dude
who did a pretty big chunk of the work for the original import, I can
say that I don't really even have the time to begin on this one. :)
What we might be able to do is find holes in the original data and see
if those holes have been filled in. That might be a reasonably simple
place to start if someone is interested.
-- Dave
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