ArcGIS Isochrones Tutorial
Isochrones show the area that is reachable from a starting point in a given amount of time, for a certain method of transport. These can replace distance radius areas to provide much more relevant catchment or trade areas.
Examples of using isochrones include:
- Calculating the number of customers within a 45 minute drive of different retail stores
- Assessing which office would mean the most employees having a 1 hour commute or less
- Determining the available workforce reachable from a number of potential real estate sites
In this tutorial, we will use the TravelTime add-in for ArcGIS Pro to calculate the isochrones around a number of retail stores, and compare the reachable population for a few different groups of stores.
We have our store data in an Excel file, with lat-long coordinates for each store.
To add this data to the map, go to Map >> Add Data >> XY Point Data
Select the relevant file from the Browser, and make sure the longitude coordinate is in the X Field and the latitude coordinate is in the Y Field.
Run the tool.
To calculate the reachable areas around each of the stores, use the Time Map Simple tool from the TravelTime toolbox.
If you are only interested in a few store locations, it may be even quicker to run the analysis by entering the individual addresses directly into the Quick Time Map tool – you can learn more about this tool here.
To access the Time Map Simple tool, open the Catalog Pane and navigate to TravelTime >> Simplified >> Time Map >> Time Map Simple
To calculate the area reachable by public transport, with a 30 minute journey time, to arrive at each store at midday, configure the tool like below.
Change the Result aggregation parameter to UNION to return one shape with all the isochrones combined. Change it to INTERSECTION to return only the area that is reachable from all the stores.
As a next step you could run the Table to Excel tool (just search for this in the Geoprocessing pane) to export this population data into Excel for further analysis.