resolution 1m is far lesser than 1m

[moononournation]

I have downloaded countries-coastline 1m resolution geojson and extracted HKG multi-polygon to plot my map. I found the islands is just some simple polygons, I don't think it is up to 1m resolution.

[simonepri]

Yeah sadly is not.
It mostly depends on the quality of the original map.
Can you have a look on Open Street Map directly?

[moononournation]

I have tried replacing "simplified-land-polygons-complete-3857.zip" to "land-polygons-complete-3857.zip", it is much better now.