[Talk-us] TIGER 2007 files

Mon Jul 21 20:37:29 BST 2008

You can use the layer-switcher on the map on the right to overlay the 2007
TIGER data on top of OSM. :)

Beau

On Mon, Jul 21, 2008 at 12:31 PM, mike.onines at juno.com <mike.onines at juno.com>
wrote:

> Nice proof of concept, that was fast.
>
> Looks like they also added turning circles and representations for
> cul-de-sacs as well.  I wonder where they made their data pull to get the
> level of detail the 2007 file for your area seems to indicate.
>
>
> As a thought, overlaying the datasets on each other might be useful for
> tracing the improvements into OSM.  There would have to be some color coding
> and transparency in order to allow you to differentiate between old and new.
>
> The next step would be automatic difference highlighting, although the
> criteria for what counts as different enough to highlight, and the algorithm
> to use to compare the datasets would be tricky.
>
>  -Mike
> ____________________________________________________________
> Golf Vacation around the world. Click Now.
>
> http://thirdpartyoffers.juno.com/TGL2131/fc/Ioyw6iifDoFciNzUEdF5yoGCbQBcT1RHzWrgmwWN6hECQpfXk0fN14/
> And a screenshot, because everybody loves screenshots.
>
>
> Beau
>
> On Sun, Jul 20, 2008 at 11:21 PM, Beau Gunderson <beau at beaugunderson.com>
> wrote:
>
>> I unzipped the King County edges file and made do with that. Here's my
>> proof of concept:
>>
>>    http://beaugunderson.com/osm/
>>
>> The first map controls the second in terms of panning and zooming.
>>
>> You can see that the 2007 data is leaps and bounds ahead of the TIGER data
>> that got imported (at least in this area). The freeway interchanges were
>> very bad and quite low resolution before, they're now quite good.
>>
>> The map is centered on 47.61038, -122.20068; just East of Seattle.
>>
>>
>> Beau
>>
>>
>> On Sun, Jul 20, 2008 at 9:28 PM, Beau Gunderson <beau at beaugunderson.com>
>> wrote:
>>
>>> I just tried to create the tool you proposed but the TIGER shapefiles are
>>> 8gb zipped and after downloading them I've only got 6gb free on my
>>> webserver. :)
>>>
>>> To download all the shapefiles you can use:
>>>
>>>    # wget -r -A "*edges*" ftp://ftp2.census.gov/geo/tiger/TIGER2007FE/
>>>
>>> After that I was going to write a script to create a Mapnik XML file with
>>> them all in it and then display that with OpenLayers side-by-side with the
>>> current OSM map using Mapstraction and this as a reference:
>>>
>>>    http://www.mapstraction.com/ljn.php
>>>
>>> Maybe someone with more space can give it a try... I'm still clearing
>>> space on my server so I may get farther along at some point!
>>>
>>>
>>> Beau
>>>
>>>
>>> On Sun, Jul 20, 2008 at 6:39 PM, mike.onines at juno.com <
>>> mike.onines at juno.com> wrote:
>>>
>>>> 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" <beau at beaugunderson.com> 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 <dave at sr71.net> wrote:
>>>>
>>>>> On Thu, 2008-07-17 at 21:10 +0000, mike.onines at juno.com 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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>>>>>
>>>>
>>>>
>>>>
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>>
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