I would like to execute a 2 step floating catchment area (2SFCA) in ArcGIS. I've been referencing this paper, but something's awry with my output, i.e. various null values, etc.
The purpose of this method is to identify the population to facility ratio for medical treatment facilities.
I have calculated a service area with 15, 30, 50, 55 minute break values. Joined centroid county populations to summed, which would ideally give the population reach per service area.
Next, a service area is created around a centroid with the same break values and a spatial join is conducted to identify the number of facilities within each service area by using the county centroid as the proxy.
After my series of spatial joins I am receiving a number of null values which makes me think my method is incorrect.
The first step that I am taking is to create a service area of 15, 30, 50, 55 minutes around medical facilities.
The second step is spatially joining the county centroids to the service areas and summing population.
This gives me the population per service area in addition to the number of facilities per service area.
Next I add a field and divide the count/population.
My goal is to gather the measurement or ratio for each county. I.E. 1:4 ratio for a county based on the above parameters.
The method which I have chosen is as follows:
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The purpose of this method is to identify the population to facility ratio for medical treatment facilities.
I have calculated a service area with 15, 30, 50, 55 minute break values. Joined centroid county populations to summed, which would ideally give the population reach per service area.
Next, a service area is created around a centroid with the same break values and a spatial join is conducted to identify the number of facilities within each service area by using the county centroid as the proxy.
After my series of spatial joins I am receiving a number of null values which makes me think my method is incorrect.
The first step that I am taking is to create a service area of 15, 30, 50, 55 minutes around medical facilities.
The second step is spatially joining the county centroids to the service areas and summing population.
This gives me the population per service area in addition to the number of facilities per service area.
Next I add a field and divide the count/population.
My goal is to gather the measurement or ratio for each county. I.E. 1:4 ratio for a county based on the above parameters.
The method which I have chosen is as follows:
- Create service areas
- Join weighted points to service areas
- Select tracts(polygons) by location that intersect service area
- Attribute join points to tracts
- feature to point
- spatial join points to county to determine the population that has access to facilities within a threshold.
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