public class BoxSearch
{
    public double LatitudeTopLeft { get; set; }
    public double LongitudeTopLeft { get; set; }
    public double LatitudeBottomRight { get; set; }
    public double LongitudeBottomRight { get; set; }
}

        [Route("api/Box")]
        [HttpPost]
        public IActionResult Box([FromBody] BoxSearch box)
        {
            var query = new GeoBoundingBoxQuery();
            query.TopLeft(box.LongitudeTopLeft, box.LatitudeTopLeft);
            query.BottomRight(box.LongitudeBottomRight, box.LatitudeBottomRight);
            var searchParams = new SearchParams()
                // .Fields("geo", "name") // omitting because of bug NCBC-1651
                .Limit(10)
                .Timeout(TimeSpan.FromMilliseconds(10000));
            var searchQuery = new SearchQuery
            {
                Query = query,
                Index = "mygeoindex",
                SearchParams = searchParams
            };
            var results = _bucket.Query(searchQuery);

// ... snip ...

public class GeoSearchResult
{
    public double Latitude { get; set; }
    public double Longitude { get; set; }
    public InfoWindow InfoWindow { get; set; }
}

public class InfoWindow
{
    public string Content { get; set; }
}

// ... snip ...

            var list = new List<GeoSearchResult>();
            foreach (var hit in results.Hits)
            {
                // *** this part shouldn't be necessary
                // the geo and name should come with the search results
                // but there's an SDK bug NCBC-1651
                var doc = _bucket.Get<dynamic>(hit.Id).Value;
                // ****************
                list.Add(new GeoSearchResult
                {
                    Latitude = doc.geo.lat,
                    Longitude = doc.geo.lon,
                    InfoWindow = new InfoWindow
                    {
                        Content = doc.name + "<br />" +
                            doc.city + ", " +
                            doc.state + " " +
                            doc.country
                    }
                });
            }
            return Ok(list);
        }

public class PointSearch
{
    public double Latitude { get; set; }
    public double Longitude { get; set; }
    public int Distance { get; set; }
    // miles is being assumed as the unit
    public string DistanceWithUnits => Distance + "mi";
}

[Route("api/Point")]
[HttpPost]
public IActionResult Point([FromBody] PointSearch point)
{
    var query = new GeoDistanceQuery();
    query.Latitude(point.Latitude);
    query.Longitude(point.Longitude);
    query.Distance(point.DistanceWithUnits);
    var searchParams = new SearchParams()
        // .Fields("geo", "name") // omitting because of bug NCBC-1651
        .Limit(10)
        .Timeout(TimeSpan.FromMilliseconds(10000));
    var searchQuery = new SearchQuery
    {
        Query = query,
        Index = "mygeoindex",
        SearchParams = searchParams
    };
    var results = _bucket.Query(searchQuery);

    var list = new List<GeoSearchResult>();
    foreach (var hit in results.Hits)
    {
        // *** this part shouldn't be necessary
        // the geo and name should come with the search results
        // but there's an SDK bug NCBC-1651
        var doc = _bucket.Get<dynamic>(hit.Id).Value;
        // ****************
        list.Add(new GeoSearchResult
        {
            Latitude = doc.geo.lat,
            Longitude = doc.geo.lon,
            InfoWindow = new InfoWindow
            {
                Content = doc.name + "<br />" +
                          doc.city + ", " +
                          doc.state + " " +
                          doc.country
            }
        });
    }
    return Ok(list);
}

<google-map
    if.bind="markers"
    map-click.delegate="clickMap($event)"
    latitude="37.780986253433895"
    longitude="-122.45291600632277"
    zoom="12"
    markers.bind="markers">
</google-map>

public clickMap(event : any) {
    var latLng = event.detail.latLng,
        lat = latLng.lat(),
        lng = latLng.lng();

    // only update top left if it hasn't been set yet
    // or if bottom right is already set
    if (!this.longitudeTopLeft || this.longitudeBottomRight) {
        this.longitudeTopLeft = lng;
        this.latitudeTopLeft = lat;
        this.longitudeBottomRight = null;
        this.latitudeBottomRight = null;
    } else {
        this.longitudeBottomRight = lng;
        this.latitudeBottomRight = lat;
    }
}

<p>
    Bounding box search:
    <br />
    Latitude (top left):
        <input type="text" value="${ latitudeTopLeft }" />
    Longitude (top left):
        <input type="text" value="${ longitudeTopLeft }" />
    <br />
    Latitude (bottom right):
        <input type="text" value="${ latitudeBottomRight }" />
    Longitude (bottom right):
        <input type="text" value="${ longitudeBottomRight }" />
    <br />
    <input
        if.bind="latitudeTopLeft && latitudeBottomRight"
        click.trigger="searchClick()"
        type="button"
        name="search"
        value="Search" />
</p>

public searchClick() {
    let boxSearch = {
        latitudeTopLeft: this.latitudeTopLeft,
        longitudeTopLeft: this.longitudeTopLeft,
        latitudeBottomRight: this.latitudeBottomRight,
        longitudeBottomRight: this.longitudeBottomRight
    };

    console.log("POSTing to api/Box: " + JSON.stringify(boxSearch));

    this.http.fetch('api/Box', { method: "POST", body: json(boxSearch) })
        .then(result => result.json() as Promise<any[]>)
        .then(data => {
            this.markers = data;
        });
}

public clickMap(event: any) {
    var latLng = event.detail.latLng,
        lat = latLng.lat(),
        lng = latLng.lng();

    this.longitude = lng;
    this.latitude = lat;
}

geosearchbox.html:

    <p>
        Distance search:
        <br />
        Latitude: <input type="text" value="${ latitude }" />
        Longitude: <input type="text" value="${ longitude }" />
        <br />
        Distance (miles): <input type="text" value="${ distance }" />
        <br />
        <input if.bind="latitude" click.trigger="searchClick()" type="button" name="search" value="Search" />
    </p>

geosearchbox.ts:

    public searchClick() {
        let pointSearch = {
            latitude: this.latitude,
            longitude: this.longitude,
            distance: this.distance
        };

        console.log("POSTing to api/Point: " + JSON.stringify(pointSearch));

        this.http.fetch('api/Point', { method: "POST", body: json(pointSearch) })
            .then(result => result.json() as Promise<any[]>)
            .then(data => {
                this.markers = data;
            });
    }
}