CODEWITHSUNDEEP
phpelasticsearch
J.Zil
J.Zil

Reputation: 2449

Geo Searching with Elasticsearch

This is just a quick question. I am planning to change my search system to elasticsearch. If I send elasticsearch three pieces of information in my request:

And my elasticsearch results are tagged with the following information:

Is it possible for me to only return results within that distance without needed any additional elasticsearch plugins? Is this functionality built into elasticsearch?

Upvotes: 0

Views: 234

Answers (1)

pickypg
pickypg

Reputation: 22342

Yes, in three pretty simple steps. You must map the data (like setting up a database schema), insert the data, and then search for it (filter).

You must appropriately map the field so that it is recognized as a geo_point. Note: If you wanted more flexibility to store other types of geolocations (e.g., polygons or linestrings), then you would want to map it as a geo_shape.

{
  "mappings" : {
    "TYPE_NAME" : {
      "properties" : {
        "fieldName" : { "type" : "geo_point" }
      }
    }
  }
}

Once mapped, you can insert the location details using the point type.

{
  "fieldName" : {
    "type" : "point",
    "coordinates" : [ longitude, latitude ]
  }
}

You can type it in differently to get the same effect, but perhaps more intuitively (rather than [ X, Y ], which is not the most common geospatial order).

{
  "fieldName" : {
    "type" : "point",
    "coordinates" : {
      "lat" : latitude,
      "lon" : longitude
    }
  }
}

Either way, it will represent the same thing (same goes for below in the filter).

Once you have mapped the field and started to insert points, then you can run a geo_distance filter to find points within the desired distance:

{
  "filtered" : {
    "query" : { "match_all" : {} },
    "filter" : {
      "geo_distance" : {
        "distance" : "10mi",
        "fieldName" : [ longitude, latitude ]
      }
    }
  }
}

Upvotes: 1

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