Changing the legend image
By default the legend in Map Drawer is generated dynamically based on the layers that are
displayed. If you prefer you can also set a static image to use for the legend by specifying
the image's URL.
To set the image URL, open the MapApplications configuration and search the attribute values for "legend-url." This takes you to an option node where the value attribute specifies the image that you want to show.
You can either specify a URL for the image or paste in the actual image data in the form of a base64 string.