Adding a raster image from a WMS service
Another kind of layer that you can add, is a WMS layer. This layer is already prepared for you in raster (pixels) format, and not in vector (lines) format. A WMS service can contain multiple layers, so we are going to choose if we want to get one or many layers from this service. Be aware that all the layers that are selected from the WMS will be saved in only one layer in bettermaps. So, if you intend to use them differently, you may want to add them separately instead of together.