Define neighbours based on railway lines/roads instead of contiguity of polygons?

[Balu Pawde]

​I want to define neighbours based on the railway routes/roads instead of contiguity of polygons. I tried to import a shp file containing railway data in Geoda ​but it gives an error saying that line data is not supported. Can you help me out with this?

[Julia Koschinsky]

Hi Balu,

You can't do this in GeoDa bc it doesn't support line files but the steps to generate a gal or gwt spatial weights file based on railway routes would be:

Let's say you have rail stops that are part of a route (point file) for destinations, and for origins, centroids of building parcels or some other unit.

You can use GTFS feeds/sth like OpenTrip Planner to calculate travel times between your points of origin and destination. This will get you a matrix eg of origins in rows to destinations in columns (or an NxN matrix if you use e.g. block or tract centroids for origins and destinations).

Next step would be to convert this matrix to a gwt  weights file that you can then load into GeoDa.

If you don't need travel times but just distance, you could use the steps above with street network distance instead.

Best,

Julia

Julia Koschinsky, Ph.D.

Executive Director and Senior Research Associate

Center for Spatial Data Science

University of Chicago

https://spatial.uchicago.edu/

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From: openspa...@googlegroups.com <openspa...@googlegroups.com> on behalf of Balu Pawde <balup...@gmail.com>
Sent: Friday, June 24, 2022 7:48 AM
To: Openspace List <openspa...@googlegroups.com>
Subject: [Openspace] Define neighbours based on railway lines/roads instead of contiguity of polygons?

 

​I want to define neighbours based on the railway routes/roads instead of contiguity of polygons. I tried to import a shp file containing railway data in Geoda ​but it gives an error saying that line data is not supported. Can you help me out with this?

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[Nicolas Cadieux]

Hi,

Dis you find a solution for this?  If not, if have a python solution for you.  The problem is that I am on vacation.  I could publish the algorithm online in about a month. 

Nicolas Cadieux

https://gitlab.com/njacadieux

Le 6 juill. 2022 à 09:14, Julia Koschinsky <jkosc...@uchicago.edu> a écrit :



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