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Change quad tree max levels to 29. Closes #21191 (#29663)

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* [DOCS] Changed quad tree max levels to 29. Clears 21191

* Changed QuadPrefixTree max levels to 29 and added defaults. Closes #21191
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Sue Gallagher 2018-05-03 09:48:21 -07:00 committed by GitHub
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10
docs/reference/mapping/types/geo-shape.asciidoc
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@ -32,7 +32,7 @@ best tree_levels value to honor this precision. The value should be a
number followed by an optional distance unit. Valid distance units number followed by an optional distance unit. Valid distance units
include: `in`, `inch`, `yd`, `yard`, `mi`, `miles`, `km`, `kilometers`, include: `in`, `inch`, `yd`, `yard`, `mi`, `miles`, `km`, `kilometers`,
`m`,`meters`, `cm`,`centimeters`, `mm`, `millimeters`. `m`,`meters`, `cm`,`centimeters`, `mm`, `millimeters`.
| `meters` | `50m`
|`tree_levels` |Maximum number of layers to be used by the PrefixTree. |`tree_levels` |Maximum number of layers to be used by the PrefixTree.
This can be used to control the precision of shape representations and This can be used to control the precision of shape representations and
@ -42,7 +42,7 @@ certain level of understanding of the underlying implementation, users
may use the `precision` parameter instead. However, Elasticsearch only may use the `precision` parameter instead. However, Elasticsearch only
uses the tree_levels parameter internally and this is what is returned uses the tree_levels parameter internally and this is what is returned
via the mapping API even if you use the precision parameter. via the mapping API even if you use the precision parameter.
| `50m` | various
|`strategy` |The strategy parameter defines the approach for how to |`strategy` |The strategy parameter defines the approach for how to
represent shapes at indexing and search time. It also influences the represent shapes at indexing and search time. It also influences the
@ -119,14 +119,14 @@ Geohashes are base32 encoded strings of the bits of the latitude and
longitude interleaved. So the longer the hash, the more precise it is. longitude interleaved. So the longer the hash, the more precise it is.
Each character added to the geohash represents another tree level and Each character added to the geohash represents another tree level and
adds 5 bits of precision to the geohash. A geohash represents a adds 5 bits of precision to the geohash. A geohash represents a
rectangular area and has 32 sub rectangles. The maximum amount of levels rectangular area and has 32 sub rectangles. The maximum number of levels
in Elasticsearch is 24. in Elasticsearch is 24; the default is 9.
* QuadPrefixTree - Uses a * QuadPrefixTree - Uses a
http://en.wikipedia.org/wiki/Quadtree[quadtree] for grid squares. http://en.wikipedia.org/wiki/Quadtree[quadtree] for grid squares.
Similar to geohash, quad trees interleave the bits of the latitude and Similar to geohash, quad trees interleave the bits of the latitude and
longitude the resulting hash is a bit set. A tree level in a quad tree longitude the resulting hash is a bit set. A tree level in a quad tree
represents 2 bits in this bit set, one for each coordinate. The maximum represents 2 bits in this bit set, one for each coordinate. The maximum
amount of levels for the quad trees in Elasticsearch is 50. number of levels for the quad trees in Elasticsearch is 29; the default is 21.
[[spatial-strategy]] [[spatial-strategy]]
[float] [float]