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Vector tile search API

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Vector tile search API

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Searches a vector tile for geospatial values. Returns results as a binary Mapbox vector tile.

GET my-index/_mvt/my-geo-field/15/5271/12710

Request

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GET <target>/_mvt/<field>/<zoom>/<x>/<y>

POST <target>/_mvt/<field>/<zoom>/<x>/<y>

Prerequisites

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Before using this API, you should be familiar with the Mapbox vector tile specification.
If the Elasticsearch security features are enabled, you must have the read index privilege for the target data stream, index, or alias. For cross-cluster search, see Configure remote clusters with security.

Path parameters

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<target>

(Required, string) Comma-separated list of data streams, indices, or aliases to search. Supports wildcards (*). To search all data streams and indices, omit this parameter or use * or _all.

To search a remote cluster, use the <cluster>:<target> syntax. See Search across clusters.

<field>

(Required, string) Field containing geospatial values to return. Must be a geo_point or geo_shape field. The field must have doc values enabled. Cannot be a nested field.

Vector tiles do not natively support geometry collections. For geometrycollection values in a geo_shape field, the API returns a hits layer feature for each element of the collection. This behavior may change in a future release.

<zoom>

(Required, integer) Zoom level for the vector tile to search. Accepts 0-29.

<x>

(Required, integer) X coordinate for the vector tile to search.

<y>

(Required, integer) Y coordinate for the vector tile to search.

Description

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Internally, Elasticsearch translates a vector tile search API request into a search containing:

A geo_bounding_box query on the <field>. The query uses the <zoom>/<x>/<y> tile as a bounding box.
A geotile_grid or geohex_grid aggregation on the <field>. The grid_agg parameter determines the aggregation type. The aggregation uses the <zoom>/<x>/<y> tile as a bounding box.
Optionally, a geo_bounds aggregation on the <field>. The search only includes this aggregation if the exact_bounds parameter is true.
If the optional parameter with_labels is true, the internal search will include a dynamic runtime field that calls the getLabelPosition function of the geometry doc value. This enables the generation of new point features containing suggested geometry labels, so that, for example, multi-polygons will have only one label.

For example, Elasticsearch may translate a vector tile search API request with a grid_agg argument of geotile and an exact_bounds argument of true into the following search:

GET my-index/_search
{
  "size": 10000,
  "query": {
    "geo_bounding_box": {
      "my-geo-field": {
        "top_left": {
          "lat": -40.979898069620134,
          "lon": -45
        },
        "bottom_right": {
          "lat": -66.51326044311186,
          "lon": 0
        }
      }
    }
  },
  "aggregations": {
    "grid": {
      "geotile_grid": {
        "field": "my-geo-field",
        "precision": 11,
        "size": 65536,
        "bounds": {
          "top_left": {
            "lat": -40.979898069620134,
            "lon": -45
          },
          "bottom_right": {
            "lat": -66.51326044311186,
            "lon": 0
          }
        }
      }
    },
    "bounds": {
      "geo_bounds": {
        "field": "my-geo-field",
        "wrap_longitude": false
      }
    }
  }
}

The API returns results as a binary Mapbox vector tile. Mapbox vector tiles are encoded as Google Protobufs (PBF). By default, the tile contains three layers:

A hits layer containing a feature for each <field> value matching the geo_bounding_box query.
An aggs layer containing a feature for each cell of the geotile_grid or geohex_grid. The layer only contains features for cells with matching data.
A meta layer containing:
- A feature containing a bounding box. By default, this is the bounding box of the tile.
- Value ranges for any sub-aggregations on the geotile_grid or geohex_grid.
- Metadata for the search.

The API only returns features that can display at its zoom level. For example, if a polygon feature has no area at its zoom level, the API omits it.

The API returns errors as UTF-8 encoded JSON.

Query parameters

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You can specify several options for this API as either a query parameter or request body parameter. If you specify both parameters, the query parameter takes precedence.

exact_bounds

(Optional, Boolean) If false, the meta layer’s feature is the bounding box of the tile. Defaults to false.

If true, the meta layer’s feature is a bounding box resulting from a geo_bounds aggregation. The aggregation runs on <field> values that intersect the <zoom>/<x>/<y> tile with wrap_longitude set to false. The resulting bounding box may be larger than the vector tile.

extent: (Optional, integer) Size, in pixels, of a side of the tile. Vector tiles are square with equal sides. Defaults to 4096.

buffer: (Optional, integer) Size, in pixels, of a clipping buffer outside the tile. This allows renderers to avoid outline artifacts from geometries that extend past the extent of the tile. Defaults to 5.

grid_agg

(Optional, string) Aggregation used to create a grid for the <field>.

Valid values for grid_agg

geotile (Default): geotile_grid aggregation.
geohex: geohex_grid aggregation.

grid_precision

(Optional, integer) Precision level for cells in the grid_agg. Accepts 0-8. Defaults to 8. If 0, results don’t include the aggs layer.

Grid precision for geotile

For a grid_agg of geotile, you can use cells in the aggs layer as tiles for lower zoom levels. grid_precision represents the additional zoom levels available through these cells. The final precision is computed by as follows:

<zoom> + grid_precision

For example, if <zoom> is 7 and grid_precision is 8, then the geotile_grid aggregation will use a precision of 15. The maximum final precision is 29.

The grid_precision also determines the number of cells for the grid as follows:

(2^grid_precision) x (2^grid_precision)

For example, a value of 8 divides the tile into a grid of 256 x 256 cells. The aggs layer only contains features for cells with matching data.

Grid precision for geohex

For a grid_agg of geohex, Elasticsearch uses <zoom> and grid_precision to calculate a final precision as follows:

<zoom> + grid_precision

This precision determines the H3 resolution of the hexagonal cells produced by the geohex aggregation. The following table maps the H3 resolution for each precision.

For example, if <zoom> is 3 and grid_precision is 3, the precision is 6. At a precision of 6, hexagonal cells have an H3 resolution of 2. If <zoom> is 3 and grid_precision is 4, the precision is 7. At a precision of 7, hexagonal cells have an H3 resolution of 3.

Precision	Unique tile bins	H3 resolution	Unique hex bins	Ratio
1	4	0	122	30.5
2	16	0	122	7.625
3	64	1	842	13.15625
4	256	1	842	3.2890625
5	1024	2	5882	5.744140625
6	4096	2	5882	1.436035156
7	16384	3	41162	2.512329102
8	65536	3	41162	0.6280822754
9	262144	4	288122	1.099098206
10	1048576	4	288122	0.2747745514
11	4194304	5	2016842	0.4808526039
12	16777216	6	14117882	0.8414913416
13	67108864	6	14117882	0.2103728354
14	268435456	7	98825162	0.3681524172
15	1073741824	8	691776122	0.644266719
16	4294967296	8	691776122	0.1610666797
17	17179869184	9	4842432842	0.2818666889
18	68719476736	10	33897029882	0.4932667053
19	274877906944	11	237279209162	0.8632167343
20	1099511627776	11	237279209162	0.2158041836
21	4398046511104	12	1660954464122	0.3776573213
22	17592186044416	13	11626681248842	0.6609003122
23	70368744177664	13	11626681248842	0.165225078
24	281474976710656	14	81386768741882	0.2891438866
25	1125899906842620	15	569707381193162	0.5060018015
26	4503599627370500	15	569707381193162	0.1265004504
27	18014398509482000	15	569707381193162	0.03162511259
28	72057594037927900	15	569707381193162	0.007906278149
29	288230376151712000	15	569707381193162	0.001976569537

Hexagonal cells don’t align perfectly on a vector tile. Some cells may intersect more than one vector tile. To compute the H3 resolution for each precision, Elasticsearch compares the average density of hexagonal bins at each resolution with the average density of tile bins at each zoom level. Elasticsearch uses the H3 resolution that is closest to the corresponding geotile density.

grid_type

(Optional, string) Determines the geometry type for features in the aggs layer. In the aggs layer, each feature represents a cell in the grid.

Valid values for grid_type

grid (Default): Each feature is a Polygon of the cell’s geometry. For a grid_agg of geotile, the feature is the cell’s bounding box. For a grid_agg of geohex, the feature is the hexagonal cell’s boundaries.
point: Each feature is a Point that’s the centroid of the cell.
centroid: Each feature is a Point that’s the centroid of the data within the cell. For complex geometries, the actual centroid may be outside the cell. In these cases, the feature is set to the closest point to the centroid inside the cell.

size: (Optional, integer) Maximum number of features to return in the hits layer. Accepts 0-10000. Defaults to 10000. If 0, results don’t include the hits layer.

track_total_hits

(Optional, integer or Boolean) Number of hits matching the query to count accurately. Defaults to 10000.

If true, the exact number of hits is returned at the cost of some performance. If false, the response does not include the total number of hits matching the query.

with_labels

(Optional, Boolean) If true, the hits and aggs layers will contain additional point features representing suggested label positions for the original features.

Point and MultiPoint features will have one of the points selected.
Polygon and MultiPolygon features will have a single point generated, either the centroid, if it is within the polygon, or another point within the polygon selected from the sorted triangle-tree.
LineString features will likewise provide a roughly central point selected from the triangle-tree.
The aggregation results will provide one central point for each aggregation bucket.

All attributes from the original features will also be copied to the new label features. In addition, the new features will be distinguishable using the tag _mvt_label_position.

Request body

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aggs

(Optional, aggregation object) Sub-aggregations for the grid_agg. Supports the following aggregation types:

avg
boxplot
cardinality
extended stats
max
median absolute deviation
min
percentile
percentile-rank
stats
sum
value count

The aggregation names can’t start with _mvt_. The _mvt_ prefix is reserved for internal aggregations.

exact_bounds

(Optional, Boolean) If false, the meta layer’s feature is the bounding box of the tile. Defaults to false.

extent

(Optional, integer) Size, in pixels, of a side of the tile. Vector tiles are square with equal sides. Defaults to 4096.

buffer

(Optional, integer) Size, in pixels, of a clipping buffer outside the tile. This allows renderers to avoid outline artifacts from geometries that extend past the extent of the tile. Defaults to 5.

fields

(Optional, array of strings and objects) Fields to return in the hits layer. Supports wildcards (*).

This parameter does not support fields with array values. Fields with array values may return inconsistent results.

You can specify fields in the array as a string or object.

Properties of fields objects

field

(Required, string) Field to return. Supports wildcards (*).

format

(Optional, string) Format for date and geospatial fields. Other field data types do not support this parameter.

date and date_nanos fields accept a date format. geo_point and geo_shape fields accept:

geojson (default)

GeoJSON

wkt

Well Known Text

mvt(<spec>)

Binary Mapbox vector tile. The API returns the tile as a base64-encoded string. The <spec> has the format <zoom>/<x>/<y> with two optional suffixes: @<extent> and/or :<buffer>. For example, 2/0/1 or 2/0/1@4096:5.

mvt parameters

<zoom>: (Required, integer) Zoom level for the tile. Accepts 0-29.
<x>: (Required, integer) X coordinate for the tile.
<y>: (Required, integer) Y coordinate for the tile.
<extent>: (Optional, integer) Size, in pixels, of a side of the tile. Vector tiles are square with equal sides. Defaults to 4096.
<buffer>: (Optional, integer) Size, in pixels, of a clipping buffer outside the tile. This allows renderers to avoid outline artifacts from geometries that extend past the extent of the tile. Defaults to 5.

grid_agg

(Optional, string) Aggregation used to create a grid for the <field>.

Valid values for grid_agg

geotile (Default): geotile_grid aggregation.
geohex: geohex_grid aggregation.

grid_precision

(Optional, integer) Precision level for cells in the grid_agg. Accepts 0-8. Defaults to 8. If 0, results don’t include the aggs layer.

Grid precision for geotile

<zoom> + grid_precision

For example, if <zoom> is 7 and grid_precision is 8, then the geotile_grid aggregation will use a precision of 15. The maximum final precision is 29.

The grid_precision also determines the number of cells for the grid as follows:

(2^grid_precision) x (2^grid_precision)

For example, a value of 8 divides the tile into a grid of 256 x 256 cells. The aggs layer only contains features for cells with matching data.

Grid precision for geohex

For a grid_agg of geohex, Elasticsearch uses <zoom> and grid_precision to calculate a final precision as follows:

<zoom> + grid_precision

This precision determines the H3 resolution of the hexagonal cells produced by the geohex aggregation. The following table maps the H3 resolution for each precision.

Precision	Unique tile bins	H3 resolution	Unique hex bins	Ratio
1	4	0	122	30.5
2	16	0	122	7.625
3	64	1	842	13.15625
4	256	1	842	3.2890625
5	1024	2	5882	5.744140625
6	4096	2	5882	1.436035156
7	16384	3	41162	2.512329102
8	65536	3	41162	0.6280822754
9	262144	4	288122	1.099098206
10	1048576	4	288122	0.2747745514
11	4194304	5	2016842	0.4808526039
12	16777216	6	14117882	0.8414913416
13	67108864	6	14117882	0.2103728354
14	268435456	7	98825162	0.3681524172
15	1073741824	8	691776122	0.644266719
16	4294967296	8	691776122	0.1610666797
17	17179869184	9	4842432842	0.2818666889
18	68719476736	10	33897029882	0.4932667053
19	274877906944	11	237279209162	0.8632167343
20	1099511627776	11	237279209162	0.2158041836
21	4398046511104	12	1660954464122	0.3776573213
22	17592186044416	13	11626681248842	0.6609003122
23	70368744177664	13	11626681248842	0.165225078
24	281474976710656	14	81386768741882	0.2891438866
25	1125899906842620	15	569707381193162	0.5060018015
26	4503599627370500	15	569707381193162	0.1265004504
27	18014398509482000	15	569707381193162	0.03162511259
28	72057594037927900	15	569707381193162	0.007906278149
29	288230376151712000	15	569707381193162	0.001976569537

grid_type

(Optional, string) Determines the geometry type for features in the aggs layer. In the aggs layer, each feature represents a cell in the grid.

Valid values for grid_type

grid (Default): Each feature is a Polygon of the cell’s geometry. For a grid_agg of geotile, the feature is the cell’s bounding box. For a grid_agg of geohex, the feature is the hexagonal cell’s boundaries.
point: Each feature is a Point that’s the centroid of the cell.
centroid: Each feature is a Point that’s the centroid of the data within the cell. For complex geometries, the actual centroid may be outside the cell. In these cases, the feature is set to the closest point to the centroid inside the cell.

query

(Optional, object) Query DSL used to filter documents for the search.

runtime_mappings

(Optional, object of objects) Defines one or more runtime fields in the search request. These fields take precedence over mapped fields with the same name.

Properties of runtime_mappings objects

<field-name>

(Required, object) Configuration for the runtime field. The key is the field name.

Properties of <field-name>

type

(Required, string) Field type, which can be any of the following:

boolean
composite
date
double
geo_point
ip
keyword
long
lookup

script

(Optional, string) Painless script executed at query time. The script has access to the entire context of a document, including the original _source and any mapped fields plus their values.

This script must include emit to return calculated values. For example:

"script": "emit(doc['@timestamp'].value.dayOfWeekEnum.toString())"

size

(Optional, integer) Maximum number of features to return in the hits layer. Accepts 0-10000. Defaults to 10000. If 0, results don’t include the hits layer.

sort

(Optional, array of sort objects) Sorts features in the hits layer.

By default, the API calculates a bounding box for each feature. It sorts features based on this box’s diagonal length, from longest to shortest.

track_total_hits

(Optional, integer or Boolean) Number of hits matching the query to count accurately. Defaults to 10000.

If true, the exact number of hits is returned at the cost of some performance. If false, the response does not include the total number of hits matching the query.

with_labels

(Optional, Boolean) If true, the hits and aggs layers will contain additional point features representing suggested label positions for the original features.

Point and MultiPoint features will have one of the points selected.
Polygon and MultiPolygon features will have a single point generated, either the centroid, if it is within the polygon, or another point within the polygon selected from the sorted triangle-tree.
LineString features will likewise provide a roughly central point selected from the triangle-tree.
The aggregation results will provide one central point for each aggregation bucket.

All attributes from the original features will also be copied to the new label features. In addition, the new features will be distinguishable using the tag _mvt_label_position.

Response

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Returned vector tiles contain the following data:

hits

(object) Layer containing results for the geo_bounding_box query.

Properties of hits

extent: (integer) Size, in pixels, of a side of the tile. Vector tiles are square with equal sides.

version

(integer) Major version number of the Mapbox vector tile specification.

features

(array of objects) Array of features. Contains a feature for each <field> value that matches the geo_bounding_box query.

Properties of features objects

geometry

(object) Geometry for the feature.

Properties of geometry

type

(string) Geometry type for the feature. Valid values are:

UNKNOWN
POINT
LINESTRING
POLYGON

coordinates

(array of integers or array of arrays) Tile coordinates for the feature.

properties

(object) Properties for the feature.

Properties of properties

_id: (string) Document _id for the feature’s document.
_index: (string) Name of the index for the feature’s document.
<field>: Field value. Only returned for fields in the fields parameter.

type

(integer) Identifier for the feature’s geometry type. Values are:

1 (POINT)
2 (LINESTRING)
3 (POLYGON)

aggs

(object) Layer containing results for the grid_agg aggregation and its sub-aggregations.

Properties of aggs

extent

(integer) Size, in pixels, of a side of the tile. Vector tiles are square with equal sides.

version

(integer) Major version number of the Mapbox vector tile specification.

features

(array of objects) Array of features. Contains a feature for each cell of the grid.

Properties of features objects

geometry

(object) Geometry for the feature.

Properties of geometry

type

(string) Geometry type for the feature. Valid values are:

UNKNOWN
POINT
LINESTRING
POLYGON

coordinates

(array of integers or array of arrays) Tile coordinates for the feature.

properties

(object) Properties for the feature.

Properties of properties

_count: (long) Count of the cell’s documents.
_key: (string) Bucket key of the cell in the format <zoom>/<x>/<y>.
<sub-aggregation>.value: Sub-aggregation results for the cell. Only returned for sub-aggregations in the aggs parameter.

type

(integer) Identifier for the feature’s geometry type. Values are:

1 (POINT)
2 (LINESTRING)
3 (POLYGON)

meta

(object) Layer containing metadata for the request.

Properties of meta

extent

(integer) Size, in pixels, of a side of the tile. Vector tiles are square with equal sides.

version

(integer) Major version number of the Mapbox vector tile specification.

features

(array of objects) Contains a feature for a bounding box.

Properties of features objects

geometry

(object) Geometry for the feature.

Properties of geometry

type

(string) Geometry type for the feature. Valid values are:

UNKNOWN
POINT
LINESTRING
POLYGON

coordinates

(array of integers or array of arrays) Tile coordinates for the feature.

properties

(object) Properties for the feature.

Properties of properties

_shards.failed

(integer) Number of shards that failed to execute the search. See the search API’s shards response property.

_shards.skipped

(integer) Number of shards that skipped the search. See the search API’s shards response property.

_shards.successful

(integer) Number of shards that executed the search successfully. See the search API’s shards response property.

_shards.total

(integer) Total number of shards that required querying, including unallocated shards. See the search API’s shards response property.

aggregations._count.avg

(float) Average _count value for features in the aggs layer.

aggregations._count.count

(integer) Number of unique _count values for features in the aggs layer.

aggregations._count.max

(float) Largest _count value for features in the aggs layer.

aggregations._count.min

(float) Smallest _count value for features in the aggs layer.

aggregations._count.sum

(float) Sum of _count values for features in the aggs layer.

aggregations.<sub-aggregation>.avg

(float) Average value for the sub-aggregation’s results.

aggregations.<agg_name>.count

(integer) Number of unique values from the sub-aggregation’s results.

aggregations.<agg_name>.max

(float) Largest value from the sub-aggregation’s results.

aggregations.<agg_name>.min

(float) Smallest value from the sub-aggregation’s results.

aggregations.<agg_name>.sum

(float) Sum of values for the sub-aggregation’s results.

hits.max_score

(float) Highest document _score for the search’s hits.

hits.total.relation

(string) Indicates whether hits.total.value is accurate or a lower bound. Possible values are:

eq: Accurate
gte: Lower bound

hits.total.value

(integer) Total number of hits for the search.

timed_out

(Boolean) If true, the search timed out before completion. Results may be partial or empty.

took

(integer) Milliseconds it took Elasticsearch to run the search. See the search API’s took response property.

type

(integer) Identifier for the feature’s geometry type. Values are:

1 (POINT)
2 (LINESTRING)
3 (POLYGON)

Examples

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The following requests create the museum index and add several geospatial location values.

response = client.indices.create(
  index: 'museums',
  body: {
    mappings: {
      properties: {
        location: {
          type: 'geo_point'
        },
        name: {
          type: 'keyword'
        },
        price: {
          type: 'long'
        },
        included: {
          type: 'boolean'
        }
      }
    }
  }
)
puts response

response = client.bulk(
  index: 'museums',
  refresh: true,
  body: [
    {
      index: {
        _id: '1'
      }
    },
    {
      location: 'POINT (4.912350 52.374081)',
      name: 'NEMO Science Museum',
      price: 1750,
      included: true
    },
    {
      index: {
        _id: '2'
      }
    },
    {
      location: 'POINT (4.901618 52.369219)',
      name: 'Museum Het Rembrandthuis',
      price: 1500,
      included: false
    },
    {
      index: {
        _id: '3'
      }
    },
    {
      location: 'POINT (4.914722 52.371667)',
      name: 'Nederlands Scheepvaartmuseum',
      price: 1650,
      included: true
    },
    {
      index: {
        _id: '4'
      }
    },
    {
      location: 'POINT (4.914722 52.371667)',
      name: 'Amsterdam Centre for Architecture',
      price: 0,
      included: true
    }
  ]
)
puts response

PUT museums
{
  "mappings": {
    "properties": {
      "location": {
        "type": "geo_point"
      },
      "name": {
        "type": "keyword"
      },
      "price": {
        "type": "long"
      },
      "included": {
        "type": "boolean"
      }
    }
  }
}

POST museums/_bulk?refresh
{ "index": { "_id": "1" } }
{ "location": "POINT (4.912350 52.374081)", "name": "NEMO Science Museum",  "price": 1750, "included": true }
{ "index": { "_id": "2" } }
{ "location": "POINT (4.901618 52.369219)", "name": "Museum Het Rembrandthuis", "price": 1500, "included": false }
{ "index": { "_id": "3" } }
{ "location": "POINT (4.914722 52.371667)", "name": "Nederlands Scheepvaartmuseum", "price":1650, "included": true }
{ "index": { "_id": "4" } }
{ "location": "POINT (4.914722 52.371667)", "name": "Amsterdam Centre for Architecture", "price":0, "included": true }

The following request searches the index for location values that intersect the 13/4207/2692 vector tile.

GET museums/_mvt/location/13/4207/2692
{
  "grid_agg": "geotile",
  "grid_precision": 2,
  "fields": [
    "name",
    "price"
  ],
  "query": {
    "term": {
      "included": true
    }
  },
  "aggs": {
    "min_price": {
      "min": {
        "field": "price"
      }
    },
    "max_price": {
      "max": {
        "field": "price"
      }
    },
    "avg_price": {
      "avg": {
        "field": "price"
      }
    }
  }
}

The API returns results as a binary vector tile. When decoded into JSON, the tile contains the following data:

{
  "hits": {
    "extent": 4096,
    "version": 2,
    "features": [
      {
        "geometry": {
          "type": "Point",
          "coordinates": [
            3208,
            3864
          ]
        },
        "properties": {
          "_id": "1",
          "_index": "museums",
          "name": "NEMO Science Museum",
          "price": 1750
        },
        "type": 1
      },
      {
        "geometry": {
          "type": "Point",
          "coordinates": [
            3429,
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