Andrea Aime GeoSolutions Styling Natural Earth with GeoServer CSS

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Intro: Natural Earth and GeoCSS

Natural Earth • Natural Earth is a public domain map dataset • Featuring tightly integrated vector and raster data

Natural Earth, datasets • Data available at 1:10m, 1:50m, and 1:110 million scales.

Natural Earth, some 10m data

GeoServer CSS (GeoCSS) • CSS inspired language for map styling • Compact, powerful, human readable, human writable * { stroke: blue; fill: #7EB5D3; label: [name]; label-anchor: 0.5 0.5; font-fill: black; font-family: "Arial"; font-size: 14; halo-radius: 2; halo-color: #7EB5D3; halo-opacity:0.8; }

A basemap for training purposes • Wanted to have a significant, yet not too complicated, base map, in CSS, for GeoSolutions’ training package • What about osm-styles?

osm-styles is too big • Nice, comprehensive, used in geoserver.org too • But way too big roads.css

Setting up for a simpler map • Let’s do Natural Earth instead • With simple, yet interesting, styles • Inspiration: the printed maps found in atlases when I was a kid

The political map

Political map of the world

Political map of the world

Political map of the world

Political map of the world

The layer group

Simple yet interesting: oceans /* @title ocean */ [@sd > 70M] { fill: lighten(lightblue, 15%), symbol('shape://slash'); :fill { size: 5; stroke: lighten(lightblue, 10%); stroke-width: 1; } }

Using external tools: color brewer • Color countries so that no two neighbouring share the same color • MAPCOLOR7 attribute supports use case • colorbrewer2.org to pick colors

Turning brewer into CSS fill: [Recode(MAPCOLOR7, 1, '#fbb4ae', 2, lighten('#b3cde3', '5%'), 3, '#ccebc5', 4, lighten('#decbe4', '5%'), 5, '#fed9a6', 6, '#ffffcc', 7, '#e5d8bd')];

Labelling countries label: [NAME]; label-anchor: 0.5 0.5; font-family: 'Noto Sans'; font-size: 14; font-fill: lighten(black, 20%); halo-color: white; halo-radius: 1; label-priority: [POP_EST]; label-auto-wrap: 100; label-max-displacement: 50;

Pen up, pen down, pen up, … /* @title States */ [@sd > 20M] [@sd < 70M] { stroke: darkgray; stroke-dasharray: 4 4; stroke-width: 0.1; label: [name]; label-anchor: 0.5 0.5; font-family: 'Noto Sans'; font-size: 10; font-fill: black; halo-color: white; halo-radius: 1; halo-opacity: 50%; label-auto-wrap: 70; label-max-displacement: 50; label-fit-goodness: 0.8; label-priority: 50M; }

Getting the right blend… /* @title Urban areas */ [@sd < 70M][@sd > 20M] { fill: lightgray; } /* @title Urban areas */ [@sd < 70M][@sd > 20M] { fill: lightgray; fill-opacity: 70%; composite: 'multiply'; }

Continuously adapt size /* @title States and provinces */ [@sd < 20M] { stroke: darkgray; stroke-dasharray: 4 4; stroke-width: [interpolate(@sd, 2M, 2, 10M, 0.1)]; label: [name]; label-anchor: 0.5 0.5; … [scalerank <= 2] { font-size: [interpolate(@sd, 2M, 16, 20M, 10)]; label-priority: 50M; }; }

Roads… it’s never easy /* @title Roads */ [@sd < 20M] { [featurecla = 'Ferry'] { stroke: lighten(blue, 30%); stroke-dasharray: 4 4; }; [featurecla = 'Road'] { [@sd < 10M] { stroke: desaturate(darkorange, 50%); stroke-width: 0.5; }; [@sd < 10M][type = 'Secondary Highway'] { stroke: darkorange; stroke-width: 1; }; [@sd < 20M][type = 'Major Highway'] { stroke: orange, yellow; stroke-width: 3, 1; z-index: 0, 1; label: [local]; label-anchor: 0.5 0.5; font-family: 'Noto Sans';

Roads… it’s never easy /* @title Roads */ [@sd < 20M] { [featurecla = 'Ferry'] { stroke: lighten(blue, 30%); stroke-dasharray: 4 4; }; [featurecla = 'Road'] { [@sd < 10M] { stroke: desaturate(darkorange, 50%); stroke-width: 0.5; }; [@sd < 10M][type = 'Secondary Highway'] { stroke: darkorange; stroke-width: 1; }; [@sd < 20M][type = 'Major Highway'] { stroke: orange, yellow; stroke-width: 3, 1; z-index: 0, 1; }; }; }

And road plates too label: [local]; label-anchor: 0.5 0.5; font-family: 'Noto Sans'; font-fill: black; label-group: true; label-repeat: 200; shield: symbol(square); shield-resize: stretch; shield-margin: 2; :shield { fill: white; stroke: orange; stroke-width: 0.2; };

How about a physical map?

Physical map of the world

Physical map of the world

Ok, how can I get it?

But on GitHub, of course! • GeoSolution’s Natural Earth styles repository • https://github.com/geosolutions-it/ne-styles • The physical map is in a branch right now: • https://github.com/geosolutions-it/ne-styles/tree /physical

That’s all folks! Questions? andrea.aime@geosolutionsgroup.com info@geosolutionsgroup.com