Region Masking Functionality

[valentina-s]

The mask function of the Regions2D object is not working currently.

The actual functionality is in the mask method of the Regions2DMasker

Working example for making "Hake" region masks (only one region) in this notebook.

Some considerations:

• input could be one or many regions (based on region id's)
• user wants all regions for a given label to be in the same mask
• user want regions with different labels to be layers in the mask dataset
• user wants regions with different labels to be in one layer (for example they want to combine all fish regions into one layer)
• provide some options to the user how to store the pixel values of the masked regions

A few extra details:

• adding regionmask version as a requirement
• adding init.py
• add examples in notebooks
• add examples selecting different regions based on labels

[leewujung]

#45 partially addressed this issue.

[valentina-s]

The only one that is not addressed is 3) storing different regions in different layers. I will make a stand alone issue and we can discuss the format. #75