Sometimes in the past, if my memories are right, I once looked at one map that shows the most cheap living cities in Indonesia, based on the minimum wage and the living cost in that city. Years after, I search again the map, and I found nothing. But then I found the similar map about living-wage in United States, written in this article. The article shows a lot of map, but the interactive map itself is not available anymore. But the tool, called the Living Wage Calculator made by MIT are still available online. So I go checked how the calculator worked, and happily they also published the technical documentation and research method, complete with any assumption needed.
Inspired by the calculator, and the “missing” interactive map, I tried to make it by myself. After collecting some dataset from the government officials, the Central Bureau of Statistics, I found a lot of missing data. The city/regency levels minimum wage didn’t cover all of Indonesia, and for the living cost data provided by the Central Bureau of Statistics only cover 84 cities/regencies all over Indonesia, yet 26 (almost quarter of the cities covered) are located in Java Island. Then I decided to make the interactive map only on Java Island. The method itself almost similar from what the MIT did, but I simplified it because of lack of data.
After learning to made the bar chart with d3.js, this time I level up my game for making map with the same tool. I did the map analysis with QGIS, an open source geographic information system. It has a bunch of tools to analyze spatial (or not) data, and because I only have 26 cities/regencies living cost dataset, I have to interpolate it to all 119 cities/regencies all over Java Island with it.
As a compensation for the bad mobile performance, I write the summary of this little research on this article. Enjoy!