OpenStreetMap 開放街圖
The latest installation of my yearly osm node density visualization is now online: https://tyrasd.github.io/osm-node-density shows the freshest data from mid 2017 (while the results from previous years starting with 2014 are also available on the site’s layer selection menu).
Can you guess where the following example screenshot was taken?
Click here to find out.
討論
由 Endres Pelka 於 2017年07月 3日 03時29分 發表的評論
Could you please remove that fade-out-fade-in effect when switching layers? It only causes “change blindness”.
由 imagico 於 2017年07月 3日 08時41分 發表的評論
@Jedrzej - you need to change the color scale (in terms of nodes per square kilometer) as you zoom because the maximum node density per square kilometer is much migher if you integrate over smaller pixels at the high zoom levels than if you integrate over larger pixels.
But the non-linearity of the color scale could be adjusted to approximately maintain the overall color level of the map.
@tyr_asd - last year Joost Schouppe suggested comparing the node density to population density since there is obviously some correlation between those two, i wonder if anyone did something like that since then - this could be used to find the most overmapped/undermapped parts of the world relative to population.
由 tyr_asd 於 2017年07月 3日 09時31分 發表的評論
@Jedrzej Pelka: You mean the short flash of a black screen when switching layers, right? Does it look better now? I’ve now actually added in a bit of fading to make the layer switching smoother.
@imagico: Right. But I’m not sure if Joost (or anyone else) has already had time to actually look into it, though.
由 Tefexus 於 2017年07月11日 09時40分 發表的評論
Looks great! Thanks. The screenshot is showing mostly Zimbabwe with Harare on the upper right and Francistown at the center bottom.
由 Tefexus 於 2017年07月11日 11時00分 發表的評論
oh. Just saw you linked directly to the solution. Now my comment looks a bit dumb… :)