Our documentation for 512px tile size is missing a required tile_size param on the Tangram YAML side:

• https://mapzen.com/documentation/vector-tiles/use-service/#512-tile-size
• https://mapzen.com/documentation/tangram/sources/#tile_size

We should also reference 512px tile size in the help landing page:

• https://mapzen.com/documentation/vector-tiles/#requesting-tiles

  More information is available about how to use the vector tile service and specify 512px tile size and custom layers in the service (though we recommend the default all layer).