Thanks, David. I think you pointed to the way forward. I would just add
that the information does not have to all be in the same central database
to be useful, if there are reliable ways to link the attribution from one
database with features or attributes in another. US DOT carries
information about major US highways, and State DOTs about state maintained
roads, and city street departments about those they are responsible for.
No one has the whole picture.
Charles Dingman, Geographer/301-763-1120
4H040, Geography Division
US Census, 4600 Silver Hill Rd Stop 7400
Washington, DC 20233-7400
"Johnson, Steven
E"
<johnson_steven_e To
@bah.com> <[email protected]>
Sent by: cc
geowanking-bounce
[EMAIL PROTECTED] Subject
RE: [Geowanking] Map Image APIs
04/25/2007 12:02
PM
Please respond to
[EMAIL PROTECTED]
burri.to
David et al,
I've mostly lurked on this list, but this a good opportunity for me to
de-lurk and offer some clarification...
The Census Bureau uses the transportation geography in support of its
central mission, which is the constitutionally-mandated census and
demographic profiles, -not transportation applications. Thus, it's very
difficult for the Census Bureau to justify the added expense of collecting
turn restrictions, speed limits, and so forth.
On the other hand, state DOT's and USDOT have far more need for those
attributes that support routing and network connectivity. So, your second
line of questioning, with regard to helping to create the intergovernmental
relationships necessary to add on to the TIGER geography may be a better
focus for discussions on this list. Where does it make sense for USDOT (and
state DOT's) to team up with Census to add this level of attribution? How
would this process be governed and how would the governance process insure
that the missions of both Census and DOT were met? Lastly, how can this
list be used to generate and advance the kind of collaborative partnerships
that could enhance TIGER and other national data resources?
Hope this helps brings the discussion into sharper focus,
Steven
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of David William
Bitner
Sent: Wednesday, April 25, 2007 11:03 AM
To: [email protected]
Subject: Re: [Geowanking] Map Image APIs
Charles,
I understand that routing improvements are not in the budget as they are
not required for any Census operations. However, The Census Bureau must
realize that they produce the only publicly available nationwide dataset of
this type that has far broader applications than their own internal
business needs. What can we do as a community to try to help secure
funding or to create relationships with other government agencies (federal
or otherwise) to whom these enhancements would be valuable? With a dataset
as import as this street data is, we need to make sure that we keep the
blinders off.
David
On 4/24/07, [EMAIL PROTECTED] < [EMAIL PROTECTED]>
wrote:
I don't think there will be any further releases of TIGER/Line Files (see
http://www.census.gov/geo/www/tiger/future/future_tl.html), though the
information will be released in several other forms, once or twice a
year.
The underlying database will have more accurate coordinate information
for
more counties, as the MAF/TIGER Accuracy Improvement Program completes,
but
new data that would help with routing, such as turn restrictions, speeds,
and one-way streets, are not included. They are not in the budget, and
not
required by any planned operation that would justify them in the budget.
Charles Dingman, Geographer/301-763-1120
4H040, Geography Division
US Census, 4600 Silver Hill Rd Stop 7400
Washington, DC 20233-7400
"Tom Longson
(nym)"
<[EMAIL PROTECTED]
To
m> [email protected]
Sent by:
cc
geowanking-bounce
[EMAIL PROTECTED]
Subject
Re: [Geowanking] Map Image APIs
04/24/2007 05:09
PM
Please respond to
[EMAIL PROTECTED]
burri.to
>From what I understand using TIGER for routing is a bad idea because
TIGER
doesn't say which roads are one way, on ramps, off ramps, etc. Could be
potentially dangerous, although very cool regardless. I personally love
this...
"Graphserver will return an itinerary between any two connected vertices,
even if the itinerary is absurd. In this case traveling by bus and foot
from downtown Seattle to deep within the foothills of the Cascade
Mountians
involves an eight-hour hike from one of the most remote bus stops in the
county." - http://graphserver.sourceforge.net/img/absurd_route_large.png
Anyone have info when the next release of TIGER is expected, and if it
will
have more data to solve some of these routing problems?
Tom Longson
________________
CAR&D / Cars.com
On 4/24/07, Paul Ramsey < [EMAIL PROTECTED]> wrote:
Ryan Sarver wrote:
> We run mapserver internally and I was trying to avoid it as a
> consumer-facing app could be pretty taxing on the system. It's much
more
> fun to use someone else's resources :). But its sounding like that
might
> be my best bet.
Robust at a software level, not so much at a "good answers" level.
Using
TIGER for routing is contraindicated.
--
Paul Ramsey
Refractions Research
http://www.refractions.net
[EMAIL PROTECTED]
Phone: 250-383-3022
Cell: 250-885-0632
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