EPSG information on plot, change to meta data by PngImagePlugin

[Reimar Bauer]

The EPSG Number e.g. 4326 on the plot is useful because this can be used to verify that the created image by the server matches the configuration of the client. Both draw on the same map projection. This is a kind of debugging possibility if something strange happen.

For a common user this is somehow meta data, and may be he has no idea what the meaning is.

If we would change this into adding metadata by the PngImagePlugin we could add a lot more usefull informations

https://stackoverflow.com/questions/10532614/can-matplotlib-add-metadata-to-saved-figures

I would be interested in server and client version of mss. Description from the server definition, EPSG Number, etc.

[Reimar Bauer]

this information visible gives a hint that we use both side the right projection

hiding is no option