faq 34471966

Mapping between parcels and TAZs

by Sashi Gurram on 2015-09-03 09:47:54

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Dear All,

 

I know this is not a MATSim specific question, but had to turn to this forum after exhausting my other alternatives.

I am trying to simulate the visitor and freight traffic using MATSim. The visitor and freight traffic is reported in O-D tables at a TAZ resolution. However, I also have parcel information that I want to use. Obviously, each TAZ contains several parcels. So, the question is, how do I choose the origin and destination parcels from the corresponding origin and destination TAZs.

I could probably go for a random selection of parcels from each TAZ. But, I would like to make an informed decision about this and as such was trying to look for articles on this. As of now, I did not find any studies which talk about this (perhaps, I am looking in the wrong place). Any ideas or suggestions about this Parcel to TAZ mapping or any directions to existing literature on this will be greatly appreciated.

 

Thanks,

Sashi

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Comments: 1

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Re: Mapping between parcels and TAZs

by Kai Nagel on 2015-10-05 19:07:22

We have a similar problem when we need to give coordinates to activity locations since the data is often in zones but MATSim uses coordinates.  

We indeed often just use "random location inside zone".  This is relatively easy to program by randomly selecting a point in the bounding box and then rejecting it if it is not inside the zone.  

In some cases, we have corrected by land use (i.e. also rejecting points in the water, or rejecting points in "mixed commercial residential areas" with proba 1/2).

This is all quite ad-hoc.  Not ad-hoc is the following, but also probably not very helpful for you:

In some recent research (paper by Ziemke/Bhat/Nagel), we randomly generate multiple options, and then remove those that are not consistent with traffic counts.