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Geo Centroid Aggregation
editGeo Centroid Aggregation
editA metric aggregation that computes the weighted centroid from all coordinate values for a Geo-point datatype field.
Example:
{
"query" : {
"match" : { "crime" : "burglary" }
},
"aggs" : {
"centroid" : {
"geo_centroid" : {
"field" : "location"
}
}
}
}
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The |
The above aggregation demonstrates how one would compute the centroid of the location field for all documents with a crime type of burglary
The response for the above aggregation:
{
...
"aggregations": {
"centroid": {
"location": {
"lat": 80.45,
"lon": -160.22
}
}
}
}
The geo_centroid aggregation is more interesting when combined as a sub-aggregation to other bucket aggregations.
Example:
{
"query" : {
"match" : { "crime" : "burglary" }
},
"aggs" : {
"towns" : {
"terms" : { "field" : "town" },
"aggs" : {
"centroid" : {
"geo_centroid" : { "field" : "location" }
}
}
}
}
}
The above example uses geo_centroid as a sub-aggregation to a terms bucket aggregation
for finding the central location for all crimes of type burglary in each town.
The response for the above aggregation:
{
...
"buckets": [
{
"key": "Los Altos",
"doc_count": 113,
"centroid": {
"location": {
"lat": 37.3924582824111,
"lon": -122.12104808539152
}
}
},
{
"key": "Mountain View",
"doc_count": 92,
"centroid": {
"location": {
"lat": 37.382152481004596,
"lon": -122.08116559311748
}
}
}
]
}