According to the scale on the illustration the halfpipe is about 13m wide 5m+ tall with 3m of flat. “m” means metres? Am I reading that right? What are the dimensions of section A-A?
Also, where in London is the proposed site?

You’re right that the scale you’re referring to is metric (m = meters). That makes the halfpipe ~13m (~40′) wide, and just over 1m (~4′) tall.

The skatepark will be located within Kiwanis Park. East of Highbury Ave N. South of Brydges St.