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    Session: Querying: How to Query a Spatial Index

    Spatial indexes can be queried using the spatial() method which contains a full spectrum of spatial methods. The following article will cover these methods:

    Spatial 

    query.spatial(fieldName, clause);
query.spatial(field, clause);
    Parameters
    fieldName string Path to spatial field in an index
    field DynamicSpatialField Field that points to a dynamic field (used with auto-indexes). Either PointField or WktField
    clause (spatialCriteriaFactory) => spatialCriteria Spatial criteria builder

    DynamicSpatialField

    import { PointField, WktField } from "ravendb";

new PointField(latitude, longitude);

new WktField(wkt);
    Parameters
    latitude or longitude or wkt string Path to the field in a document containing either longitude, latitude or WKT

    SpatialCriteriaFactory

    spatialCriteriaFactory.relatesToShape(shapeWkt, relation);
spatialCriteriaFactory.relatesToShape(shapeWkt, relation, distErrorPercent);

spatialCriteriaFactory.intersect(shapeWkt);
spatialCriteriaFactory.intersect(shapeWkt, distErrorPercent) ;

spatialCriteriaFactory.contains(shapeWkt);
spatialCriteriaFactory.contains(shapeWkt, distErrorPercent);

spatialCriteriaFactory.disjoint(shapeWkt);
spatialCriteriaFactory.disjoint(shapeWkt, distErrorPercent);

spatialCriteriaFactory.within(shapeWkt);

spatialCriteriaFactory.within(shapeWkt, distErrorPercent);

spatialCriteriaFactory.withinRadius(radius, latitude, longitude);
spatialCriteriaFactory.withinRadius(radius, latitude, longitude, radiusUnits);
spatialCriteriaFactory.withinRadius(radius, latitude, longitude, radiusUnits, distErrorPercent);
    Parameters
    shapeWkt string WKT-based shape to be used in operation
    relation SpatialRelation Shape relation. Can be Within, Contains, Disjoint, Intersects
    distErrorPercent number Maximum distance error tolerance in percents. Default: 0.025
    radius or latitude or longitude number Used to define a radius circle
    radiusUnits SpatialUnits Determines if circle should be calculated in Kilometers or Miles units

    Example I

    // return all matching entities
// within 10 kilometers radius
// from 32.1234 latitude and 23.4321 longitude coordinates
const results = await session
    .query({ collection: "Houses" })
    .spatial(
        new PointField("latitude", "longitude"),
        f => f.withinRadius(10, 32.1234, 23.4321))
    .all();
    from Houses
where spatial.within(spatial.point(latitude, longitude), spatial.circle(10, 32.1234. 23.4321))

    Example II

    // return all matching entities
// within 10 kilometers radius
// from 32.1234 latitude and 23.4321 longitude coordinates
// this equals to WithinRadius(10, 32.1234, 23.4321)
const results = await session
    .query({ collection: "Houses" })
    .spatial(
        new PointField("latitude", "longitude"),
        f => f.relatesToShape("Circle(32.1234 23.4321 d=10.0000)", "Within")
    )
    .all();
    from Houses
where spatial.within(spatial.point(latitude, longitude), spatial.wkt('Circle(32.1234 23.4321 d=10.0000)'))

    OrderByDistance

    To sort by distance from given point use the orderByDistance() method. The closest results will come first.

    query.orderByDistance(field, latitude, longitude);

query.orderByDistance(field, shapeWkt);

query.orderByDistance(fieldName, latitude, longitude);

query.orderByDistance(fieldName, shapeWkt);
    Parameters
    fieldName string Path to spatial field in index
    field DynamicSpatialField Field that points to a dynamic field (used with auto-indexes). Either PointField or WktField
    shapeWkt string WKT-based shape to be used as a point from which distance will be measured. If the shape is not a single point, then the center of the shape will be used as a reference.
    latitude or longitude number Used to define a point from which distance will be measured

    Example

    // return all matching entities
// within 10 kilometers radius
// from 32.1234 latitude and 23.4321 longitude coordinates
// sort results by distance from 32.1234 latitude and 23.4321 longitude point
const results = await session
    .query({ collection: "Houses" })
    .spatial(
        new PointField("latitude", "longitude"),
        f => f.withinRadius(10, 32.1234, 23.4321)
    )
    .orderByDistance(
        new PointField("latitude", "longitude"),
        32.12324, 23.4321)
    .all();
    from Houses
where spatial.within(spatial.point(latitude, longitude), spatial.circle(10, 32.1234. 23.4321))
order by spatial.distance(spatial.point(latitude, longitude), spatial.point(32.1234, 23.4321))

    OrderByDistanceDescending

    To sort by distance from given point use the orderByDistanceDescending() method. The farthest results will come first.

    query.orderByDistanceDescending(field, latitude, longitude);

query.orderByDistanceDescending(field, shapeWkt);

query.orderByDistanceDescending(fieldName, latitude, longitude);

query.orderByDistanceDescending(fieldName, shapeWkt);
    Parameters
    fieldName string Path to spatial field in index
    field DynamicSpatialField Field that points to a dynamic field (used with auto-indexes). Either PointField or WktField
    shapeWkt string WKT-based shape to be used as a point from which distance will be measured. If the shape is not a single point, then the center of the shape will be used as a reference.
    latitude or longitude number Used to define a point from which distance will be measured

    Example

    // return all matching entities
// within 10 kilometers radius
// from 32.1234 latitude and 23.4321 longitude coordinates
// sort results by distance from 32.1234 latitude and 23.4321 longitude point
const results = await session
    .query({ collection: "Houses" })
    .spatial(
        new PointField("latitude", "longitude"),
        f => f.withinRadius(10, 32.1234, 23.4321)
    )
    .orderByDistanceDescending(
        new PointField("latitude", "longitude"),
        32.12324, 23.4321)
    .all();
    from Houses
where spatial.within(spatial.point(latitude, longitude), spatial.circle(10, 32.1234. 23.4321))
order by spatial.distance(spatial.point(latitude, longitude), spatial.point(32.1234, 23.4321)) desc

    Remarks

    Note

    By default, distances are measured in kilometers.

    see on GitHub

    related articlesRelated Articles

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