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Posted by usenet on October 15, 2007, 1:46 am
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Hi everyone. I'm pursuing a long-time interest of writing a program
that can take GIS data and plan new transit routes for cities. No, it
will never be as good as what the experts can do, but the goal is that
it can examine thousands of "what-if" scenarios to glean some new
observations. If it were really successful, we might be able to make
some of today's backroom transportation planning more of a
community-owned open-source process.
I've had early success with my experiments; now it's time for real
data. I'm hoping the group can help me find a city or county for
which the following data is available.
1. Origin/Destination data
Ideally, I'd have a lat/long coordinate for every person's origin and
destination throughout the day. Peak hour travel would be fine, too.
I am assuming I can't get that much of a detailed model, so I am
prepared to make my own. To do that, I would need 3 sets of data:
A] TAZ data, such as a table with OriginTaz, DestTaz, Quantity, for
each TAZ pair.
B] I would also need the descriptions of all the TAZs. It probably
exists in a shape file, but I specifically need to extract that into
the format I understand, which would be a collection of lines that
determine the edges. Something of the form [(x,y), (x,y)], [(x,y),
(x,y)], ... for each TAZ.
C] A listing of all the buildings or parcels in the area so I can
assign trips to each parcel. Something like
Parcel #: 123
Type: Residential
Units: 1
Lat, Lon, [TAZ]:
Parcel #: 124
Type: Multi-family
Units: 4
Lat, Lon, [TAZ]:
Parcel #: 125
Type: Commercial-Retail
Sq ft: 5,500
Lat, Lon, [TAZ]:
Parcel #126
Type: Commercial-Office
Sq ft: 28,000
Lat, Lon, [TAZ]:
Parcel #127
Type: Industrial
Sq ft: 2,200
Lat, Lon, [TAZ]:
etc.
2. Land use grid
The second half of this would be a land-use mode. For me, I am
breaking the metro area into a grid, and I need to determine what is
happening at each location. I store this data in a database as a
single entry for each point.
I think the easiest way to get this info is for me to prioritize the
available layers (e.g., roads are on top, water features next, ....),
then ask for a large image of the result. If there are unique colors
for the image, I can work through the image pixel by pixel to create
the database I need. The only difficulty is that I'd like each pixel
to represent 10 meters, so either the image will be huge, or we'd have
to break the metro up into a set of images.
If you're still reading, I appreciate it. If you can identify a city
/ metro area where I can get this data in the form I need, please let
me know.
Jeral
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Posted by Jean H. on October 15, 2007, 2:12 pm
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> 1. Origin/Destination data
> Ideally, I'd have a lat/long coordinate for every person's origin and
> destination throughout the day. Peak hour travel would be fine, too.
Many cities have this... but it is very difficult to obtain it, for
obvious privata life protection issues. If you are a scholar though, it
might be a bit easier but still pretty difficult. In anyways, I doubt
you would get the coordinates...
> C] A listing of all the buildings or parcels in the area so I can
> assign trips to each parcel. Something like
>
> Parcel #: 123
> Type: Residential
> Units: 1
> Lat, Lon, [TAZ]:
> 2. Land use grid
> The second half of this would be a land-use mode. For me, I am
> breaking the metro area into a grid, and I need to determine what is
> happening at each location. I store this data in a database as a
> single entry for each point.
>
> I think the easiest way to get this info is for me to prioritize the
> available layers (e.g., roads are on top, water features next, ....),
> then ask for a large image of the result. If there are unique colors
> for the image, I can work through the image pixel by pixel to create
> the database I need. The only difficulty is that I'd like each pixel
> to represent 10 meters, so either the image will be huge, or we'd have
> to break the metro up into a set of images.
For point C and 2: you can use cadastral data! Also, most big cities
already have land-use maps... just contact the GIS / planning
department.
Good luck.
Jean
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Posted by usenet on October 17, 2007, 11:38 am
Please log in for more thread options On Mon, 15 Oct 2007 18:12:07 +0000 (UTC), "Jean H."
Thanks, Jean. I had approached some city GIS departments in the past,
and they were pretty limited in the choices they offered, short of
paying $60-$100/hr for custom work. I was hoping to find some vast
repository online.
I do have a contact in the transit planning department nearby. Maybe
I can find a sympathetic ear.
Jeral
>> 1. Origin/Destination data
>> Ideally, I'd have a lat/long coordinate for every person's origin and
>> destination throughout the day. Peak hour travel would be fine, too.
>
>Many cities have this... but it is very difficult to obtain it, for
>obvious privata life protection issues. If you are a scholar though, it
>might be a bit easier but still pretty difficult. In anyways, I doubt
>you would get the coordinates...
>
>> C] A listing of all the buildings or parcels in the area so I can
>> assign trips to each parcel. Something like
>>
>> Parcel #: 123
>> Type: Residential
>> Units: 1
>> Lat, Lon, [TAZ]:
>
>> 2. Land use grid
>> The second half of this would be a land-use mode. For me, I am
>> breaking the metro area into a grid, and I need to determine what is
>> happening at each location. I store this data in a database as a
>> single entry for each point.
>>
>> I think the easiest way to get this info is for me to prioritize the
>> available layers (e.g., roads are on top, water features next, ....),
>> then ask for a large image of the result. If there are unique colors
>> for the image, I can work through the image pixel by pixel to create
>> the database I need. The only difficulty is that I'd like each pixel
>> to represent 10 meters, so either the image will be huge, or we'd have
>> to break the metro up into a set of images.
>
>
>For point C and 2: you can use cadastral data! Also, most big cities
>already have land-use maps... just contact the GIS / planning
>department.
>
>Good luck.
>Jean
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