GeoPoint vs GeoLocation and Search and Sorting

[Kirtash (Sergi)]

Good morning,

Now I'm beginning to work with geoLocations and I'm using the library nest to interact to ElasticSearch, but my first question is:

• Whats is more correct? GeoLocation type or geoPoint:

Location

"location" : {
            "lat" : 2.0,
            "lon" : 34.2
          }

GeoPoint:

          "location" : {
            "type" : "point",
            "coordinates" : [
              2.8,
              41.9
            ]
          }

My intention is to do a query to find the candidates that are within a specific radius of a geopoint. I read the documentation but my query fails and I don't know the reason, can you help me please?

GET candidates/_search
{
  "from": 0,
  "size": 20, 
  "min_score": 0.1,
  "query": {
    "bool": {
      "must": [
        {
          "geo_distance": {
            "distance": "1km",
            "location": {
              "lat": 10,
              "lon": 10
            }
          }
        }
      ]
    }
  }
}

Thanks!!!

[stephenb (Stephen Brown)]

There are only 4 geo field types in Elasticsearch see here

However there are a number of ways specify / load those geo_points see here

Spatial data types

geo_point

Latitude and longitude points.

geo_shape

Complex shapes, such as polygons.

point

Arbitrary cartesian points.

shape

Arbitrary cartesian geometries.

In order to use, You will need to create a mapping with the correct field types in it in order to use geo_point or geo_shape

I also explained some geo searches here

[Kirtash (Sergi)]

First of all, thanks for the answer @stephenb!!

I think that the better option will be geo_point

About the search, is not possible make a query with only one index that has a geo_point, and specify another geopoint + distance and get these documents? Without create shape indexes. My intention is to create a form in which the user defines a location of google maps, and a distance in km.

With those values, I would like to get the documents that their geoposition is within the specified radious.

Thanks again!!

[stephenb (Stephen Brown)]

You mean like this

There are 2 types geo_distance results returned by distance or geo_shape these point are withing this shape circle

Take a look here for the query types and here for sorting

Example

Put in a few points

DELETE my-index-000001
PUT my-index-000001
{
  "mappings": {
    "properties": {
      "location": {
        "type": "geo_point"
      }
    }
  }
}

PUT my-index-000001/_doc/1
{
  "text": "location 1",
  "location": { 
    "lat": 41.12,
    "lon": -71.34
  }
}

PUT my-index-000001/_doc/2
{
  "text": "location 2",
  "location": { 
    "lat": 42.52,
    "lon": -71.00
  }
}

PUT my-index-000001/_doc/3
{
  "text": "House in london",
  "location": { 
    "lat": 51.5,
    "lon": -0.127
  }
}

Here is a search using intersect (Points withing the circle
NOTE : be carefull how you put in the coordinates it is lon, lat

# intersects not sorted
GET /my-index-000001/_search
{
  "query": {
    "bool": {
      "must": {
        "match_all": {}
      },
      "filter": [
        {
          "geo_shape": {
            "location": {
              "shape": {
                "type": "circle",
                "coordinates": [ -71.3, 41.1],
                "radius": "500km"
              },
              "relation": "intersects"
            }
          }
        }
      ]
    }
  }
}

Results Not Sorted (you could by adding the sort clause below but I just wanted to show you both)

{
  "took" : 2,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 2,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "my-index-000001",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 1.0,
        "_source" : {
          "text" : "location 1",
          "location" : {
            "lat" : 41.12,
            "lon" : -71.34
          }
        }
      },
      {
        "_index" : "my-index-000001",
        "_type" : "_doc",
        "_id" : "2",
        "_score" : 1.0,
        "_source" : {
          "text" : "location 2",
          "location" : {
            "lat" : 42.52,
            "lon" : -71.0
          }
        }
      }
    ]
  }
}

Now a distance search and sorted.

# Distance plus sort. 
GET /my-index-000001/_search
{
  "query": {
    "bool": {
      "must": {
        "match_all": {}
      },
      "filter": {
        "geo_distance": {
          "distance": "500km",
          "location": [ -71.3, 42.5 ] <!-- NOTE this needs to be the same field name as your geo_point s
        }
      }
    }
  },
  "sort" : [
    {
      "_geo_distance" : {
          "location" : [ -71.3, 42.5 ], <!-- NOTE this needs to be the same field name as your geo_point s
          "order" : "asc",
          "unit" : "km",
          "mode" : "min",
          "distance_type" : "arc",
          "ignore_unmapped": true
      }
    }
  ]
}

Results

{
  "took" : 4,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 2,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [
      {
        "_index" : "my-index-000001",
        "_type" : "_doc",
        "_id" : "2",
        "_score" : null,
        "_source" : {
          "text" : "location 2",
          "location" : {
            "lat" : 42.52,
            "lon" : -71.0
          }
        },
        "sort" : [
          24.69089016681285
        ]
      },
      {
        "_index" : "my-index-000001",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : null,
        "_source" : {
          "text" : "location 1",
          "location" : {
            "lat" : 41.12,
            "lon" : -71.34
          }
        },
        "sort" : [
          153.48501594012578
        ]
      }
    ]
  }
}

[Kirtash (Sergi)]

Thanks for the examples!! Now is working!! My error was the mapping.