ol vector source


```typevl.getSource().clear()var features = source.getFeatures();```
> [Remove All Features from Vector Layer in OpenLayers 3](https://gis.stackexchange.com/questions/122947/remove-all-features-from-vector-layer-in-openlayers-3)

> [How to get features from vector layer in Openlayers 3](https://stackoverflow.com/questions/29351968/how-to-get-features-from-vector-layer-in-openlayers-3)
