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1 Vector Tiles with GeoServer and OpenLayers2 David Blasby Canada Engineering Lead Andreas Hocevar Austria OpenLayers Engineer Gabriel Roldan Argentina Professional Services3 Image Tiled Map4 Single Open Street Map Image Tile5 A Tile of feature data Real geometry and attribute data (GeoJSON, TopoJSON, MVP, )6 Vector Tiles7 Vector Tiles versus Image Tiles 1. Client (not the server) decides on styling 2. Only need to tile the data once to have multiple maps 3. Drawn vectors can look better on high-resolution displays 4. Image Tiles are much easier to consume 5. There s more know-how in working with Vectors Empowering Efficient8 Outline of this talk GeoServer GeoWebCache OpenLayers 5 seconds to turn on Vector Tiles Vector Tiles in the OGC context Geoserver Rendering Process SLD to control Vector Tile Generation OpenLayers Overview Vector Tile Maps Styling Advanced user interaction Demo9 5 Second to turn on Vector Tiles in Geoserver &SERVICE=WMS&REQUEST=GetMap&FORMAT=application/x-type=mapbox-vector10 Vector Tiles in the OGC Services Context WMS - Creating Maps WMTS - Tiling WFS - Feature Access11 WFS and Vector Tiles Both return unstyled vector/attribute data WFS returns the underlying data unmodified Vector Tiles return modified (ready-to-render) features WFS: Glorious Detail VTs: Easy to render12 Couldn t I just use the WFS to generate VTs? 4,000,000 point polygon It s just not practical!13 GeoServer Rendering Process Overview Data Store Query Generalize SRS Xform Remove small, redundant features GeoServer s WMS has several different renders, a)streaming Renderer - used to make image maps b)vector Tiles Renderer - used to make vector tiles They work almost the same! Clip SLD14 Generalization/Simplification Data Store Query Generalize SRS Xform Remove small, redundant features Clip SLD15 Removing small, redundant features Data Store Query Generalize SRS Xform Remove small, redundant features Clip SLD16 Clipping Data Store Query Generalize SRS Xform Requested area Remove small, redundant features Clip SLD Returned Area17 SLD: Controlling what s drawn Data Store Query In GeoServer, use SLD to control map styling. Generalize SRS Xform Remove small, redundant features Three most important parts of SLD styling rules: 1. Scale 2. Filter 3. Actual style information (stroke/fill) Clip SLD Controls what s queried and rendered!18 The world s ugliest map When the map scale is more than 1:70,000 - include the residential roads.19 20 Tick!21 Image Tiled Map Vector Tiles Map (same styling)22 Changing the OpenLayers Style23 Wait! Where s the Footways? No rule for type= footway GeoWebCache will automatically regenerate the cache.24 FootWays shown with dashed style (OpenLayers)25 OpenLayers26 OpenLayers: Map everything Images, image tiles, vector data, tiled vector data Any projection Any orientation -& full rotation support Animations Integrate with e.g. Cesium or d3 If it has location, OpenLayers can render it!27 Vector tiles in OpenLayers Mapbox vector tiles preferred (optimized for rendering) All vector formats supported Same styling as untiled vector data Interactive maps - access to feature attributes Not to be used as replacement for vector (as in WFS) data!28 Mapbox Vector Tiles Support ol.format.mvt Uses Mapbox's pbf library to read the binary tile data Uses Mapbox's vector-tile library to extract layers and features Configurable to only read a subset of the available layers Creates lightweight ol.renderfeature or standard ol.feature features with pixel coordinates29 How to create a vector tile layer // The OGC way, step 1: WMTS from capabilities var caps = new ol.format.wmtscapabilities().read(data); var wmts = new ol.source.wmts( ol.source.wmts.optionsfromcapabilities(caps, { layer: 'opengeo:california', matrixset: 'EPSG:3857', format: 'application/x-type=mapbox-vector' }) );30 How to create a vector tile layer // The OGC way, step 2: url and tilegrid from WMTS var layer = new ol.layer.vectortile({ source: new ol.source.vectortile({ format: new ol.format.mvt(), tileurlfunction: wmts.gettileurlfunction(), tilegrid: wmts.gettilegrid() }), style: function(feature, resolution) { /*... */ } });31 Style streets nicely [ ] new ol.style.style({ zindex: 1, stroke: new ol.style.stroke({color: '#fff', width: 4}) }), new ol.style.style({ zindex: 2, stroke: new ol.style.stroke({color: '#ddd', width: 3}) })32 Interactivity - info on hover var info = document.createelement('div'); var overlay = new ol.overlay({element: info}); map.addoverlay(overlay); map.on('pointermove', function(e) { var name = map.foreachfeatureatpixel(e.pixel, function(feature) { }); }); return feature.get('name'); info.style.display = name? '' : 'none'; info.innerhtml = overlay.setposition(e.coordinate);33 OpenLayers Demo34 Q & A35 36
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