Determine candidate points

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08-11-2020 12:13 AM
DanielLapczuk
New Contributor II

Hi. I'd like to know if it is possible to find optimal location with the location-allocation tool in ArcGIS Pro if I don't have any candidate points?

I do a research for potential locations of mobility hubs where the big hubs are located closed close to subway and train stations (I used a weighted analysis to find these locations). Now I would like to determine the small stations which should lay between those big hubs. As an influence value I want to use the population density.

Thank you.

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DanPatterson
MVP Frequent Contributor

From the tutorial

Choose the best location with Location-Allocation—ArcGIS Pro | Documentation 

They use surrogate variables to represent potential demand (TractCentroids, ExistingStores, CompetitorStores)

Do you have potentially similar data?


... sort of retired...
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JaySandhu
Esri Regular Contributor

You can use many techniques to generate "potential" candidates. One way I create these is to place a point on every street that is in your study area and then select from them, either randomly or using other spatial analysis techniques.

Assuming you have a street feature class in your study area, use the GP tool Feature To Point with the INSIDE option to create one point per street.

Feature To Point (Data Management)—ArcGIS Pro | Documentation 

This create a lot of points. You can select, say 100 points, randomly using the Create Random Feature using the point feature layer as the constraining layer.

Create Random Points (Data Management)—ArcGIS Pro | Documentation 

Or you can can buffer (or drive time polygons) your hubs to create zones where you do/don't want to place your locations and select from the street points.

Of course you can get census tract population data and further weight these points. So, there are lots of ways to make value added data by doing standard GIS operations like overlay.

Jay Sandhu

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DanielLapczuk
New Contributor II

Thank you for your answer and sorry I am writing now. 

I actually determined the points other way around. I first used the spatial analyst with a weighted overlay to figure out which areas are of high demand and then I selected points (feature to point for parks and parking lots) within this high demand areas. My problem now is that I want to have a certain distance between my chosen facilities when using location allocation. 

Do you think my approach was way to complicated with spatial analyst and then network analyst? In my opinion using weighted overlay to determine the high demand areas was more accurate, especially when playing around with the different weights.

Thanks

two chosen points to close to another

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