Dear Girmay,

Specifically on the use of segment length weight:
The segmentation of axial lines produces a large quantity of very small segments. Segment length weighting is used to reduce the overall impact on the centrality results of these small segments. It is also available for axial lines although it's not so critical.
Space syntax measures are calculated from every segment to every other segment (within radius), each being an Origin and a Destination. It is less accurate to consider the importance of all O/Ds equally, because very small segments do not account for the same number of journeys as longer ones.

Depthmap offers a O/D weight to enable this differentiation.
In integration, the depth to each destination is multiplied by the specific weight value, affecting it's impact on the total depth of the origin node. Segments with a length close to 0 (zero) give effectively no contribution to the result.
In choice, the weights of the origin and destination are combined (not sure if multiplied or added, probably the former...) and this value is assigned to the segments on the shortest route. Routes between segments with length close to 0 (zero) hardly contribute to the overall choice result.
As you can see, these weights are embedded in the algorithm, and are not simple calculations applied to the end results.

Of course one could discuss if segment length is the most appropriate weight to use, but in most cases it works well and improves results. One can also use other weights related to land use, population, or anything else, if the data is available...

Hope this helps,
Jorge

On 19/06/2014 06:08, Berhie, Girmay wrote:
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Dear all
In depth map angular analysis, we find different results including 
Choice, Choice [segment length wgt], Integration, Integration[segment length wgt], Total depth and so on.
Can any one explain to me what Integration [Segment length wgt] mean? what is it measuring for? How is it computed? Or can any one give me a reference discussed about this?
Thank you
Girmay K. Berhie
Texas Tech University
College of Architecture
Land Use Planning Management and Design (LPMD)
Mailling Address 
2008 56th Street Unite B
Lubbock TX, 79412
Cell phone +1 (806) 789 1132

 


Jorge Gil
PhD Candidate

TU Delft / Faculty of Architecture
Department of Urbanism
Chair of Spatial Planning and Strategy

Julianalaan 134
2628 BL Delft
P.O. Box 5043
2600 GA Delft
The Netherlands

www.tudelft.nl