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Questions tagged [sdna]

sDNA is an acronym for Spatial Design Network Analysis

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1answer
21 views

Error message using sDNA Prepare Network

I'm preparing a road network using the sDNA Prepare Network tool on QGIS 2.18.28. My OS is Windows 10 64 bit. I get the following error message: Algorithm Prepare Network starting... ****************...
1
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1answer
19 views

Why sDNA error is out of memory? Can it run in 64-bit?

I use sDNA to prepare road network, but as in the pic, the error is out of memory, what can I do with it? And I notice that sDNA is running in 32-bit mode, can it run in 64-bit?
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1answer
31 views

Connectivity rule regarding two-level intersections

in the sDNA documentation here: https://www.cardiff.ac.uk/sdna/wp-content/downloads/documentation/manual/sDNA_manual_v4_0_1/network_preparation.html is written that the network needs to be in shape as ...
2
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1answer
20 views

Curved lines turn to straight lines after sDNA preparation

I am an architect, sometimes I need to use sDNA to analyze networks mapped in AutoCAD. But I met a problem with curved lines, i.e. circle, or polylines. After importing .dwg file into .gdb, and using ...
1
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1answer
35 views

Error message when running sDNA license manager, Windows 10

I want to install sDNA for QGIS (Windows 10, QGIS 3) and when I try to run the license manager, I get this error message (I'm running both as admin) I've tried to click continue, but after I copy and ...
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0answers
27 views

sDNA License Manager says Please wait?

I installed sDNA and got my license, now I'm trying to runthe sDNA License Manager. I entered the code in the field to get the Challenge URL but the status information still says: Please wait... I'...
2
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1answer
46 views

Accessibility calculation with sDNA

We would like to use sDNA to calculate accessibility measures, in addition to the other measures sDNA outputs. I've been going over the documentation a fair bit, but cannot find whether one of the ...
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0answers
21 views

Network Quantity Penalized of Distance in sDNA

I'm following up on a question asked on the calculation of the Network Quantity Penalized of Distance (NQPD) with sDNA. I can calculate the value for the link asked in Why my calculated NQPD value ...
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1answer
17 views

Usage of custom metric in hybrid analysis in sdna

I would like to use a custom metric for the distance analysis in sDNA. To this end, I use the following settings: Routing and analysis metric: 'Hybrid' Radii: same order of magnitude as the metric ...
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1answer
53 views

Speeding up sDNA analysis [closed]

I am trying to analyze several cities around the world (including major cities like London, Tokyo or Beijing) using different centrality measures with varying radiis. The problem with this is that ...
2
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1answer
66 views

Using sDNA python interface [closed]

I am trying to perform road network analysis with sDNA. I have successfully generated a shapefile with all centrality measures I need using the following command in the python shell C:\Python27\...
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1answer
39 views

Normalized ancular choice (NaCH) in sDNA

Based on previous experience with depthmap, I would like to inquire about a question: does sDNA has the equivalent value of NaCH (Normalized Angular Choice) or Total Depth?
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1answer
40 views

Keeping original edge IDs in Output Feature from sDNA analysis?

I’d like to keep the original edge IDs for each link in processing a network with sDNA using the Integral Analysis function. I’m using the free version of sDNA in QGIS, and from what I understand, new ...
2
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1answer
107 views

Installing sDNA in QGIS for Mac?

How do I install sDNA in QGIS for mac? Every time I try to do it the following message appears.
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1answer
69 views

Error message using sDNA Integral Analysis [closed]

I'm analyzing a road network using the sDNA integral tool, and am getting the following error message. I'm using arcMAP 10.5. ERR: File "C:\Program Files (x86)\sDNA\bin\\sdnaintegral.py", line 4, ...
2
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1answer
69 views

Why NQPD is better than inverse of MAD/SAD in closeness measurement?

sDNA recommend use NQPD to measure closeness rather than inverse SAD/SMD/SCD/MAD/MMD/MCD. (Please refer the 3.b Closeness centrality sDNA measure description documentation ) In my understanding, ...
2
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1answer
93 views

How does the sDNA calculate betweenness?

I want to calculate the betweenness value by my hand, and then compare with sDNA calculated. But I found that I can't get the value same as what sdna calculated. Here's my case: Assume all the links ...
2
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1answer
61 views

Why my calculated NQPD value is different than sDNA calucated?

I want to calculate the NQPD value (Network Quantity Penalized of Distance) by my hand, and then compare it with snda calculated. But I found that I can't the value same as what sdna calculated. My ...
3
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1answer
115 views

I want to compute the fewest turns and fewest accumulative angle change from a single origin to a set of destinations

I want to compute the fewest turns and fewest accumulative angle change from a single origin to a set of destinations. The origin and destinations are shown on this map. The flag is the origin, all ...
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0answers
35 views

sDNA custom metrics data format

I am trying to calculate road network properties while using custom distance metric in sDNA – in my case time which differs in segments depending on availability of public transport. Initially I have ...
2
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1answer
33 views

Applying cumulative usage to road sections

I would like to calculate the total 'weight' of goods which will travel across each road section of a roading network. Goods (from a nearby polygon) will arrive at the closest road section, and then ...
3
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2answers
61 views

Query regarding connectivity in network preparation - sDNA manual

I am creating a network dataset using the roads polylines contained in the OS Meridian 2 data set, in order to eventually calculate road journey distances. I have been considering connectivity and ...