topic Re: Huff Model in Python Questions

Huff Model

rrjs67 — Mon, 03 Oct 2011 17:15:48 GMT

Hi

This is written for ArcGIS 9.3 however, I am using ArcGIS 10. The code is written as tool. by Mr. Drew Flater (http://arcscripts.esri.com/details.asp?dbid=15999).
Could anyone please change to ArcGIS 10 compatible?

I am getting the error with the sample data given with the tool:
<type 'exceptions.UnicodeEncodeError'>: 'ascii' codec can't encode characters in position 29-31: ordinal not in range(128)

and the error with my data is attached:

Thanks in advance.

Re: Huff Model

DuncanHornby — Mon, 10 Oct 2011 14:23:17 GMT

Have you tried contacting the Author of this script, they would have the best chance in correcting the error? You can contact them from the Arcscript page.

Re: Huff Model

rrjs67 — Mon, 10 Oct 2011 16:16:02 GMT

Thank you..

Re: Huff Model

SagarShah — Thu, 20 Sep 2012 02:28:04 GMT

I am also facing an issue with this Script Tool. I get the following message:
---------
Executing: HuffModel GroceryStores Unique_ID Loc_Sales C:\Sagar\Huff_Model\Proof_of_Concept\Output2 te cntybnd Residences # true ND_HamCoStreets 2 NONE "Feature Set" false # #
Start Time: Wed Sep 19 23:18:30 2012
Running script HuffModel...
Finished checking inputs against parameter requirements.
PYTHON ERRORS:
Traceback Info:
File "C:\Sagar\Huff_Model\AS15999\MarketAnalysisToolbox_update01262010\Script\HuffModel.py", line 371, in <module>
attributes.reset()

Error Info:
<type 'exceptions.AttributeError'>: 'list' object has no attribute 'reset'

GP ERRORS:

Completed script HuffModel...
Failed to execute (HuffModel).
Failed at Wed Sep 19 23:18:55 2012 (Elapsed Time: 25.00 seconds)
--------
I contacted Mr.Drew Flater before two days but have not received any reply from him. The last update was in 2010 and so there is a possibility that he is not actively working on this tool.http://arcscripts.esri.com/ContactAuthor.asp?dbid=15999

I don't know python and it would be really helpful if somebody can explain what does this error message mean. I tried to do an online search but no luck. I have attached the image of the error message.

Re: Huff Model

PhilMorefield — Thu, 20 Sep 2012 19:15:09 GMT

The key piece of information is this:

<type 'exceptions.AttributeError'>: 'list' object has no attribute 'reset'

Here, 'attributes' is a property of a describe object. Apparently the geoprocesser used to return in iterator, but now it returns a Python list. Python lists don't have a 'reset' method. Thus the error.

You'll need to attach the data you are using in order for someone to troubleshoot the tool.

Re: Huff Model

PhilMorefield — Thu, 20 Sep 2012 20:05:21 GMT

Right-click on the tool, and select "Edit". You should see the script open up.

On line 10 you should see this:

gp = arcgisscripting.create(93)

Change it to this:

gp = arcgisscripting.create(9.3)

That got the tool working for me, using the example data. I'm on AGD 10.1, Windows XP.

Re: Huff Model

SagarShah — Sat, 22 Sep 2012 13:45:59 GMT

Thank you...Phil!
That totally worked.

Re: Huff Model

PhilMorefield — Fri, 20 Dec 2013 12:55:12 GMT

Hi All,

I am having the same problem, and I try changing gp = arcgisscripting.create to (10.0) as I run on Arc 10, but I am still getting the same problem. Anyone have ideas how to resolve this issue?

Thanks in advance

Executing: HuffModel Auckland_firestations Name attract "C:\Mapping files\working\Decmeber files\Huff_tool\ToolData\SAMPLE" outputfeatureclass Auckland_FSA # # true NR2M_ND 2 NONE "Feature Set" true # #
Start Time: Fri Dec 20 12:00:59 2013
Running script HuffModel...
Finished checking inputs against parameter requirements.
PYTHON ERRORS:
Traceback Info:
File "C:\Mapping files\custom_toolbox\Huff_model\Script\HuffModel.py", line 371, in <module>
attributes.reset()

Error Info:
<type 'exceptions.AttributeError'>: 'list' object has no attribute 'reset'

GP ERRORS:

Completed script HuffModel...
Failed to execute (HuffModel).
Failed at Fri Dec 20 12:01:02 2013 (Elapsed Time: 3.00 seconds)

Jeffrey-

You need to specify version 9.3 of the geoprocessor on line 11, even if you are using version ArcGIS 10.x. If you tried that and you're still getting an error, then that is a different issue.

Re: Huff Model

RaymondChetti1 — Mon, 14 Nov 2016 11:47:40 GMT

Hi All (Phil Morefield‌ you can help with this since you seem to know about this?),

I am writing in regards to the Huff Model that Drew Flater posted on ESRI's website since I seem to be running into a problem with it. The model is not generating outputs for all of my supply points, including my planned store location, whenever I run the model with a network I've created. I've followed ESRI's tutorial on creating multi-modal/pedestrian networks.

I've got 172 supply points (cafes) + 1 (my potential site), but when I run the Huff Model toolbox the analysis only gives me outputs for 69 supply points? Why am I not getting outputs (probability & sales) for all 173 supply points? Screenshots are below.

The model runs fine whenever I do not include a network, but I need the Huff Model to account for travel time/transportation networks.

Please note I have 141 Demand Points (polygons, neighborhoods) and 173 supply points in total:

NETWORK:

SUPPLY POINTS OUTPUTS AFTER RUNNING HUFF MODEL TOOL:

MAP & SUPPLY POINTS FULL LIST:

Any feedback or help is most certainly appreciated!

Cheers,

Ray

Re: Huff Model

ClintonDow1 — Mon, 14 Nov 2016 23:29:48 GMT

I'll mention this to Drew and see if we can get this script updated in the near future.

edit: There is an updated version available at http://www.arcgis.com/home/item.html?id=f4769668fc3f486a992955ce55caca18 that should work with 10.x out of the box.

Re: Huff Model

RaymondChetti1 — Tue, 15 Nov 2016 04:41:54 GMT

@Clinton, thanks for your reply. Drew Flater wrote back and mentioned that my points are not snapped along my road/street network (but despite following this the network is still not working). I wrote back to Drew and said:

When I run the OD Cost Matrix I get the error message below ("No Destinations found for point # in Origins). Origins are sub-districts (demand/market spending potential) and destinations are cafes (supply points).

Even though my points (demand and supply) are snapped to the route/street/network lines, I am still getting the same error. See below with origin point #92. What can be the problem since my network abides by "Any Vertex" and "Global Turns"?

OD Cost Matrix:

Network:

To calculate Speed_CostFinal I used: [Length_Field_Meters] / 1609 * 60 / [Speed_Field_MPH] - http://support.esri.com/technical-article/000011800

Re: Huff Model

ClintonDow1 — Tue, 15 Nov 2016 16:43:27 GMT

Hi Raymond, I'm personally unfamiliar with the finer details of the tool itself but can offer some suggestions. However your pictures aren't showing up - any chance you could upload them to an image host like TinyPic - I think right now the ones you've linked currently are password protected for me.

Re: Huff Model

RaymondChetti1 — Tue, 15 Nov 2016 16:46:23 GMT

Re: Huff Model

ClintonDow1 — Tue, 15 Nov 2016 19:22:17 GMT

The links to the pictures are still broken unfortunately.

Re: Huff Model

RaymondChetti1 — Tue, 15 Nov 2016 20:08:14 GMT

Sorry about that. These should work!! I'm not sure why they weren't before but...

Re: Huff Model

ClintonDow1 — Tue, 15 Nov 2016 20:39:38 GMT

Okay I can see them now, thanks. It still looks to me like the destination points are not along the network. In your first screenshot several of the 'blue squares' that symbolize destinations don't actually touch the network. In the properties for your destinations, under the Network Locations tab did you set the search tolerance and snap to: closest? Help Documentation