Iceberg (feature)

An iceberg is a feature composed of blue ice or packed ice. There is also a terrain feature known as an iceberg, see Terrain features.

Generation
Iceberg feature generates in frozen oceans and deep frozen oceans. They consist of packed ice or sometimes blue ice, and there's a probability of 30% that an iceberg feature is topped with snow blocks. $$, each chunk has an $1/16$ chance to try to generate a packed iceberg, and has an $1/200$ chance to try to generate a blue iceberg. $$, each chunk has an $1/8$ chance to try to generate an iceberg, which has an $1/100$ chance of being a blue iceberg.

Unlike iceberg terrain feature, iceberg feature is usually small. Iceberg terrain features generate in a wide variety of shapes and sizes, ranging from small islands to giant mountain-like icebergs.

Iceberg features have two types: circle-shaped and ellipse-shaped. There's a probability of 30%/20% that an iceberg feature is ellipse shaped. For a circle-shaped icebergs, its radius is from 0 to 11; its max height above sea level has a 90% chance of being 3—17/3—13 and a 10% chance of being 10—42/10—34; its max depth below sea level is from 3 to 18; it has a 30% chance of being carved. For an ellipse-shaped iceberg, the length of its semimajor axis is 7—11/8—15; the length of its semiminor axis is from 3 to 5; its max height above sea level is 6—11/6—9; its max depth below sea level is from 6 to 18; it has a 90% chance of being carved.

Blue ice feature
Packed ice iceberg generates sometimes with blue ice features attached to it. A blue ice feature is a pile of blue ices, which generates adjacent to a packed ice and at or below the surface of water.

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