Finding the layers and layer sizes for each Docker image

For research purposes I'm trying to crawl the public Docker registry ( http://ift.tt/1uSC6VK ) and find out 1) how many layers an average image has and 2) the sizes of these layers to get an idea of the distribution.

However I studied the API and public libraries as well as the details on the github but I cant find any method to:

• retrieve all the public repositories/images (even if those are thousands I still need a starting list to iterate through)


• find all the layers of an image


• find the size for a layer (so not an image but for the individual layer).

Can anyone help me find a way to retrieve this information?

Thank you!