MapEvent

Overview

• Render a map based on a topojson file
• Highlight areas in a map when an event occurs matching the region name
• mouse over provides shows a toolip with region information

How to use

• yarn install
• yarn start to start the application
• yarn server to start notification server

How to create a topojson map

• download a map shipfile zip file from: https://gadm.org/download_country_v3.html

• npm install -g shapefile

• npm install -g topojson

• convert each shapefile to gson:

  • shp2json gadm36_DEU_0.shp -o feature_name.json
  • or
  • sudo apt-get install gdal-bin ogr2ogr -f GeoJSON your_gson_file.json gadm36_DEU_0.shp

• convert it to topojson:

  • topojson -o outputfile.json feature_name_1.json feature_name_2.json

• When loading to d3.json be sure to be loading the feature you want:

  • topojson.feature(jsonResponse, jsonResponse.objects.feature_name_1).features

• Play around with the projection scale to fit the map

Other sites to download shapefiles from

• https://www.statsilk.com/maps/download-free-shapefile-maps#download-country-shapefile-maps
• https://wiki.openstreetmap.org/wiki/Shapefiles

GADM License

This project uses maps from gadm and therefore needs to use the same license if the same map data is used https://gadm.org/license.html