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Merge pull request #8546 from ahocevar/proj-faq

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Update projection FAQ for v5
This commit is contained in:
Andreas Hocevar
2018-08-27 08:14:28 +02:00
committed by GitHub
parent bb77fbe703 a0e72c7d42
commit bd9635f6ef
1 changed files with 10 additions and 11 deletions
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doc/faq.md
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@@ -65,20 +65,19 @@ var map = new ol.Map({
``` ```
```javascript ```javascript
// To use other projections, you have to register the projection in OpenLayers: // To use other projections, you have to register the projection in OpenLayers.
// This can easily be done with [https://proj4js.org](proj4)
// //
// By default OpenLayers does not know about the EPSG:21781 (Swiss) projection. // By default OpenLayers does not know about the EPSG:21781 (Swiss) projection.
// So we create a projection instance for EPSG:21781 and pass it to // So we create a projection instance for EPSG:21781 and pass it to
// ol.proj.addProjection to make it available to the library for lookup by its // ol.proj.addProjection to make it available to the library for lookup by its
// code. // code.
var swissProjection = new ol.proj.Projection({ proj4.defs('EPSG:21781',
code: 'EPSG:21781', '+proj=somerc +lat_0=46.95240555555556 +lon_0=7.439583333333333 +k_0=1 ' +
// The extent is used to determine zoom level 0. Recommended values for a '+x_0=600000 +y_0=200000 +ellps=bessel ' +
// projection's validity extent can be found at https://epsg.io/. '+towgs84=660.077,13.551,369.344,2.484,1.783,2.939,5.66 +units=m +no_defs');
extent: [485869.5728, 76443.1884, 837076.5648, 299941.7864], ol.proj.proj4.register(proj4);
units: 'm' var swissProjection = ol.proj.get('EPSG:21781');
});
ol.proj.addProjection(swissProjection);
// we can now use the projection: // we can now use the projection:
var map = new ol.Map({ var map = new ol.Map({