Please check these previous posts. Key word: Webmercator
- https://forum.processing.org/two/discussion/21135/add-latitude-longitude-to-csv-file-and-make-interactive-map-with-the-data
- Can't seem to map latitude and longitude coordinates correctly in Processing 3
- https://forum.processing.org/one/topic/mercator-map-project-problem-help-needed.html
I also suggest using unfoldingmaps. A previous post:
Kf