| Map type chunks in general |
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| • | A mapping of keys
(cell values) and values (cell |
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| identifiers) is
a general way of storing grid data. |
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| – | Efficient in
terms of memory use where a default |
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| value can be
set, and if there are only a small number |
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| of non-default
mappings in the chunk (compared to |
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| the number of
cells in the chunk) |
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| – | Offer the means
to generating some statistics about a |
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| chunk very
efficiently |
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| • | the diversity
(number of different values) |
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| • | mode |
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