Count Points in Polygon

Introduction

Counting the number of points or events within an area is one of the key elements of spatial data aggregation, and is a crucial component of the de-identification process for sensitive data such as turning individual health records into counts within predefined areas.

The AURIN portal has a quick, easy to use count tool to aid in this process.

Inputs

To illustrate the Count Point tool in use, we will count the number of railway stations in each SA4 in the Greater Brisbane Area.

  • Select Brisbane Greater Capital City Statistical Area as you area
  • Select the following datasets:
    •  PSMA Railway Stations (select all attributes)
    •  SA4-based B02 Selected Medians and Averages as at 2011-08-11 (select all attributes, 2011 as date filter)
  • Spatialise the SA4-based B02 Selected Medians and Averages as at 2011-08-11 dataset and rename the output: Spatialised SA4 Medians and Averages
  • Open the Count Point tool (AnalyseToolsSpatial Data ManipulationCount Points in Polygons) and enter your parameters as shown below:
    •  Points: PSMA Railway Stations
    •  Polygons: Spatialised SA4 Medians and Averages
    •  Count Attribute: RAILWAY_STATIONS
  • Once you have entered your parameters click Add and Run

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Outputs

Once you your tool has run, click on the Display button in the pop-up dialogue box. This should open up the output table. Your count column will appear in the far left hand of the table, with the count of the number of railway stations in each of the polygons (shown below):

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