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OSM Node Density – 2016 Update

English телендә tyr_asd 7 July 2016 баҫылып сыҡты.

My OSM node density visualization has just been updated to show the freshest OSM data!

A significant difference from the 2014 edition is that the density is now calculated as OSM-nodes per m² on the ground (as opposed to nodes per projected pixel in the previous version). If you want to learn more about why this change makes a difference, I’d strongly recommend the following article by Christoph Hormann (imagico).

The updated slippy map lets you chose between the layers of different years (always created around end of June of each year) as well as a display of what changed during each 12 month interval. For example you can see that in North America, there were some imports as well as some major import-cleanups going on during the last year:

Last, but not least: you can now find the source code and instructions to generate all of this in the repository on github: https://github.com/tyrasd/osm-node-density/tree/gh-pages/code

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imagicoтарафынан 7 July 2016 cәғәт 17:40көндө ҡаралған

Very nice.

The difference layers are somewhat confusing color wise - showing a color scale there would be helpful.

joost schouppeтарафынан10 February 2017 cәғәт 17:37көндө ҡаралған

Would it be very hard to get the node density of Europe on this grid? Would be kind of interesting to make a little analysis of the correlation between the two - and patterns of exceptions. Thinking about something like an analysis by clusters of squares like shown here (every slide adds or substracts 10% of the total European population) map

tyr_asdтарафынан13 February 2017 cәғәт 13:30көндө ҡаралған

@joost: nope. here you go: https://gist.github.com/tyrasd/80b2cbd9a3991e9b295124c1a6165bc2. Code and freshly processed raw data is included. osmnodes-eu.geostatgrid.csv uses keys that are compatible with the grid ids from the pop dataset, but note that their “reference grid” doesn’t include cells with 0 population.

joost schouppeтарафынан13 February 2017 cәғәт 13:41көндө ҡаралған

Damn, there goes another week-end =) Thanks! Looking forward to playing around with this.

Jennings Andersonтарафынан11 April 2017 cәғәт 18:45көндө ҡаралған

Martin, these are so cool!

I’m trying to re-run some of these with mbtiles and mapbox-gl for smooth zooming: http://www.townsendjennings.com/osm-node-density/#3.88/47.28/13.66

My resolution, however is nowhere as good as yours! What were the settings that you used when you generate your highest zoom-level png?

Thanks!

tyr_asdтарафынан12 April 2017 cәғәт 19:04көндө ҡаралған

Jennings, I think I just run the commands as explained here (I’m not sure why it reads zoom=16 here – this should also be 15 or lower). That generates a 1 gigapixel (32768x32768) density map, which cut into tiles corresponds to max zoom level 7 on the slippy map: http://tyrasd.github.io/osm-node-density/#7/-7.961/-248.373/latest,places

I tried to use my tms tile source https://s3-eu-west-1.amazonaws.com/osm-node-density/2016/{z}/{x}/{y}.png with mapboxgl as well, and see similarly blurry results. Not sure what’s going on. Maybe it’s related to https://github.com/mapbox/mapbox-gl-js/issues/4552?

Jennings Andersonтарафынан12 April 2017 cәғәт 21:02көндө ҡаралған

Thanks Martin, that’s really interesting… staying tuned.

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