Typesense supports geo search on fields containing latitude and longitude values, specified as the
geopoint field types.
Let's create a collection called
places with a field called
location of type
Let's now index a document.
Make sure to set the coordinates in the correct order:
[Latitude, Longitude]. GeoJSON often uses
[Longitude, Latitude] which is invalid!
# Searching within a Radius
We can now search for places within a given radius of a given latlong
mi for miles and
km for kilometers) using the
filter_by search parameter.
In addition, let's also sort the records that are closest to a given location (this location can be the same or different from the latlong used for filtering).
The above example uses "5.1 km" as the radius, but you can also use miles, e.g.
location:(48.90615915923891, 2.3435897727061175, 2 mi).
# Searching Within a Geo Polygon
You can also filter for documents within any arbitrary shaped polygon.
You want to specify the geo-points of the polygon as lat, lng pairs.
'filter_by' : 'location:(48.8662, 2.3255, 48.8581, 2.3209, 48.8561, 2.3448, 48.8641, 2.3469)'
# Sorting by Additional Attributes within a Radius
Sometimes, it's useful to sort nearby places within a radius based on another attribute like
popularity, and then sort by distance outside this radius.
You can use the
exclude_radius option for that.
'sort_by' : 'location(48.853, 2.344, exclude_radius: 2mi):asc, popularity:desc'
This makes all documents within a 2 mile radius to "tie" with the same value for distance.
To break the tie, these records will be sorted by the next field in the list
Records outside the 2 mile radius are sorted first on their distance and then on
popularity:desc as usual.
Similarly, you can bucket all geo points into "groups" using the
precision parameter, so that all results within this group will have the same "geo distance score".
'sort_by' : 'location(48.853, 2.344, precision: 2mi):asc, popularity:desc'
This will bucket the results into 2-mile groups and force records within each bucket into a tie for "geo score", so that the popularity metric can be used to tie-break and sort results within each bucket.
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