This example using RShiny shows how to add polygons to a map from a geoJSON file to show school catchment areas. The school locations are then plotted.

The geoJSON file used in this project can be found at:

https://spatialdata-accabdn.opendata.arcgis.com/datasets/accabdn::academy-school-catchments-2/about

The coordinates for the schools can be found in the spreadsheet below.

Spreadsheet

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