Standing up an OSM clone with GeoServer and CSS Ing. Andrea Aime GeoSolutions 

GeoSolutions ⚫ Italian SME ⚫ Expertise • Image Processing, GeoSpatial Data Fusion • Java, Java Enterprise, C++, Python • JPEG2000, JPIP, Advanced 2D visualization ⚫ Supporting/Developing FOSS4G projects ⚫ GeoServer, MapStore ⚫ GeoNetwork, GeoNode, Ckan ⚫ Clients ⚫ Public Agencies ⚫ Private Companies ⚫ http://www.geo-solutions.it FOSS4G 2019, August 26th/30th, Bucharest 

What are we talking about? 

This FOSS4G 2019, August 26th/30th, Bucharest 

Or to be more precise, this FOSS4G 2019, August 26th/30th, Bucharest 

So you have OSM in your home page • https://maps.geo- solutions.it/geoserver/osm/osm/gwc/service /wmts?request=GetCapabilities FOSS4G 2019, August 26th/30th, Bucharest 

What's behind it? FOSS4G 2019, August 26th/30th, Bucharest { } GeoCSS Imposm3 

Motivation and history 

Several attempts on-line https://wiki.openstreetmap.org/wiki/OpenStr eetMap-in-a-Box https://github.com/melbsurfer/osm- geoserver-styles https://github.com/boundlessgeo/OSM/ FOSS4G 2019, August 26th/30th, Bucharest 

Why start a new attempt FOSS4G 2019, August 26th/30th, Bucharest 

Because it's hard FOSS4G 2019, August 26th/30th, Bucharest "We choose to clone OSM, not because it's easy, but because it's hard" 

Going beyond the comfort zone FOSS4G 2019, August 26th/30th, Bucharest 

Timeline FOSS4G 2019, August 26th/30th, Bucharest github.com/aaime/osm 2017 

Timeline FOSS4G 2019, August 26th/30th, Bucharest github.com/geosolutions.it/maps.geo- solutions.it 2018 

Timeline FOSS4G 2019, August 26th/30th, Bucharest github.com/geosolutions.it/maps.geo- solutions.it 2019 

Choosing the "right" style 

Which OSM-Bright? FOSS4G 2019, August 26th/30th, Bucharest • https://github.com/gravitystorm/openstreetm ap-carto 

Other options FOSS4G 2019, August 26th/30th, Bucharest • https://github.com/mapbox/osm-bright • https://github.com/openmaptiles/osm- bright-gl-style 

Side by side comparison FOSS4G 2019, August 26th/30th, Bucharest OSM MapBox OpenMapti les 

Side by side comparison FOSS4G 2019, August 26th/30th, Bucharest OSM OpenMaptiles 

Different objectives FOSS4G 2019, August 26th/30th, Bucharest 

Consequences FOSS4G 2019, August 26th/30th, Bucharest 

Challenges 

Approach FOSS4G 2019, August 26th/30th, Bucharest 

Issue: zoom vs scale FOSS4G 2019, August 26th/30th, Bucharest #roads-casing, #bridges, #tunnels { ::casing { [zoom >= 12] { [feature = 'highway_motorway'] { line-width: @motorway-width-z12; [zoom >= 13] { line-width: @motorway-width-z13; } [zoom >= 15] { line-width: @motorway-width-z15; } [zoom >= 17] { line-width: @motorway-width-z17; } [zoom >= 18] { line-width: @motorway-width-z18; } [zoom >= 19] { line-width: @motorway-width-z19; } [zoom >= 20] { line-width: @motorway-width-z20; } [link = 'yes'] { line-width: @motorway-link-width-z12; 

Going from zoom to scale FOSS4G 2019, August 26th/30th, Bucharest 1 1:279.541.131 1:139.770.565 2 1:200.000.000 

Going from zoom to scale FOSS4G 2019, August 26th/30th, Bucharest Level Scale denominator Middle cut Rounded mid cut 0 559.082.263,95 1 279.541.131,98 419.311.698 400.000.000 2 139.770.565,99 209.655.849 200.000.000 3 69.885.282,99 104.827.924 100.000.000 4 34.942.641,50 52.413.962 50.000.000 5 17.471.320,75 26.206.981 25.000.000 6 8.735.660,37 13.103.491 12.500.000 7 4.367.830,19 6.551.745 6.000.000 8 2.183.915,09 3.275.873 3.000.000 9 1.091.957,55 1.637.936 1.500.000 10 545.978,77 818.968 800.000 11 272.989,39 409.484 400.000 12 136.494,69 204.742 200.000 13 68.247,35 102.371 100.000 14 34.123,67 51.186 50.000 15 17.061,84 25.593 25.000 16 8.530,92 12.796 12.500 17 4.265,46 6.398 6.000 18 2.132,73 3.199 3.000 19 1.066,36 1.600 1.500 20 533,18 800 800 21 266,59 400 400 22 133,30 200 200 23 66,65 100 100 

Issue: the editor is too small FOSS4G 2019, August 26th/30th, Bucharest 

Solution: side by side fullscreen editor FOSS4G 2019, August 26th/30th, Bucharest 

Issue: scale dependencies verbosity FOSS4G 2019, August 26th/30th, Bucharest [@sd <= 400k] { [feature = 'highway_motorway'] { stroke-width: 5; [@sd < 200k] { stroke-width: 5.5; } [zoom < 100k] {stroke-width: 7; } …. 

Approach: use transform functions FOSS4G 2019, August 26th/30th, Bucharest [@sd < 400k] { ... stroke-width: categorize(@sd, 9, 50k, 7, 100k, 5.5, 200k, 5); } 

Issue: SVG icons colorized at runtime FOSS4G 2019, August 26th/30th, Bucharest 

Approach: SVGs as marks FOSS4G 2019, August 26th/30th, Bucharest [type = 'fast_food'][@sd < 6k] { mark: symbol('file://symbols/fast_food.svg'); mark-size: 10; :mark { fill: #734a08 }; }; 

Issue: CSS translation times FOSS4G 2019, August 26th/30th, Bucharest 

First approach: profile and optimize FOSS4G 2019, August 26th/30th, Bucharest 

Going flat FOSS4G 2019, August 26th/30th, Bucharest 

Flat mode FOSS4G 2019, August 26th/30th, Bucharest 

Map is nice, but really slow FOSS4G 2019, August 26th/30th, Bucharest 

Pregeneralized for the win FOSS4G 2019, August 26th/30th, Bucharest 

Give me eyes on the target! FOSS4G 2019, August 26th/30th, Bucharest 

Issues found, round one FOSS4G 2019, August 26th/30th, Bucharest 

Issues found, round two FOSS4G 2019, August 26th/30th, Bucharest 

And here we are! FOSS4G 2019, August 26th/30th, Bucharest 

That's all folks FOSS4G 2019, August 26th/30th, Bucharest 

That's all folks FOSS4G 2019, August 26th/30th, Bucharest Really, didn't you forget anything??? 

Aaah, yeah, the styles! FOSS4G 2019, August 26th/30th, Bucharest • https://github.com/geosolutions-it/osm- styles 

That’s all folks! (for good this time) Questions? [email protected]