This is a map component based on OpenLayers to show different types and layers of maps from sources like OpenStreet, Bing, SwissTopo ary WMTS/WMS compatible source with some features like markes or shape drawing. The component has implemented the swiss specific coordination projection (VL03/VL95) and therefore can project map content from swisstopo (https://map.geo.admin.ch/).
Starting fromn version 1.5, the coordinates are represented and defined according to EPSG. This means the input for a Coordinate object will be switched: Coordinate(1197650, 2604200) > Coordinate(2604200, 1197650) or new Coordinate(51, 0) > Coordinate(0, 51)
https://openlayers-blazor-demo.laurent-christen.ch/
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install nuget package
dotnet add package OpenLayers.Blazor -
Download the openlayers distribution js/css files https://github.com/openlayers/openlayers or from other sources and include them in the index.html file:
<head> ... <link href="https://cdnjs.cloudflare.com/ajax/libs/openlayers/8.1.0/ol.min.css" rel="stylesheet" /> <link href="_content/OpenLayers.Blazor/OpenLayers.Blazor.css" rel="stylesheet" /> <script src="https://cdnjs.cloudflare.com/ajax/libs/openlayers/8.1.0/dist/ol.min.js"></script> ... </head>
<SwissMap Style="height:800px">
<Popup>
<div id="popup" class="ol-box">
@if (context is Marker marker)
{
<h3>@marker.Title</h3>
<p>@marker.Coordinate.X / @marker.Coordinate.Y</p>
}
</div>
</Popup>
<Features>
<Marker Type="MarkerType.MarkerPin" Coordinate="new Coordinate(2604200, 1197650)"></Marker>
<Marker Type="MarkerType.MarkerFlag" Coordinate="new Coordinate(2624200, 1177650)" Title="Hallo" BackgroundColor="#449933" Popup></Marker>
<Line Points="new []{new Coordinate(1197650, 2604200), new Coordinate(2624200, 1177650)}" BorderColor="cyan"></Line>
</Features>
</SwissMap>
<OpenStreetMap Style="height:480px; width:640px" Zoom="5" Center="new Coordinate(0, 51)">
<Layers>
<Layer SourceType="SourceType.TileWMS"
Url="https://sedac.ciesin.columbia.edu/geoserver/ows?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&FORMAT=image%2Fpng&TRANSPARENT=true&LAYERS=gpw-v3%3Agpw-v3-population-density_2000&LANG=en"
Opacity=".3"
CrossOrigin="anonymous"></Layer>
</Layers>
</OpenStreetMap>