Azure Cognitive Search - GeographyPoint to GeoJSON in .NET 5

Microsoft.Spatial GeographyPoint to GeoJSON in .NET5 using System.Text.Json.

Follow @AbhithRajanAbhith RajanMarch 13, 2021 · 2 min read · Last Updated: March 13, 2021

Azure Cognitive Search Service supported data types includes Edm.GeographyPoint.

While creating index definition using attributes in C#, to specify the field type as Edm.GeographyPoint we can use the GeographyPoint as the type.

1using Azure.Search.Documents.Indexes;
2using Microsoft.Spatial;
3
4public class RestaurantIndexModel
5{
6    ...
7
8    [SimpleField(IsFilterable = true, IsSortable = true)]
9    public GeographyPoint Location { get; set; }
10
11    ...
12}

We need to have the NuGet package Microsoft.Spatial to use the GeographyPoint type.

1<PackageReference Include="Microsoft.Spatial" Version="7.8.3" />

And with that, you can create the index definition,

But when you try to index a document with the same type,

1restaurant.Location = GeographyPoint.Create(restaurantResult.Value.Latitude, restaurantResult.Value.Longitude);

You may encounter the following issue,

{“error”:{“code”:"",“message”:“The request is invalid. Details: parameters : Invalid GeoJSON. The ‘type’ member is required, but was not found.\r\n”}}

The way you can fix this is by,

Add the following NuGet package,

1<PackageReference Include="Microsoft.Azure.Core.Spatial" Version="1.0.0" />

And then annotate your index model to use the MicrosoftSpatialGeoJsonConverter as the JsonConverter by,

1using System.Text.Json.Serialization;
2using Azure.Core.Serialization;
3using Azure.Search.Documents.Indexes;
4using Microsoft.Spatial;
5
6public class RestaurantIndexModel
7{
8    ...
9
10    [JsonConverter(typeof(MicrosoftSpatialGeoJsonConverter))]
11    [SimpleField(IsFilterable = true, IsSortable = true)]
12    public GeographyPoint Location { get; set; }
13
14    ...
15}

That will do.

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Azure Cognitive Search - GeographyPoint to GeoJSON in .NET 5

Microsoft.Spatial GeographyPoint to GeoJSON in .NET5 using System.Text.Json.

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