Converting GeoJSON to DbGeometry - geojson

Question

I am working on Bing maps, but fairly new to spatial data types. I have managed to get the GeoJson data for a shape from bing maps for example,
{"type":"MultiPolygon","coordinates":[[[[30.86202,-17.85882],[30.93311,-17.89084],[30.90701,-17.92073],[30.87112,-17.90048],[30.86202,-17.85882],[30.86202,-17.85882],[30.86202,-17.85882]]]]}
However I need to save this as DbGeomtry in SQL, how can convert GeoJson to DbGeomtry

Answer 1

Option 1.
Convert the GeoJSON to WKT and then use stgeomfromtext to create the Db object.
Option 2.
Deserialize the GeoJSON using GeoJSON.Net and then use the nuget package GeoJSON.Net.Contrib.MsSqlSpatial to convert to a Db object. eg.
DbGeography dbGeographyPoint = point.ToDbGeography();
Option 3.
For some types of GeoJSON data, modifications based on this approach can be used
drop table if exists BikeShare
create table BikeShare(
id int identity primary key,
position Geography,
ObjectId int,
Address nvarchar(200),
Bikes int,
Docks int )
declare #bikeShares nvarchar(max) =
'{"type":"FeatureCollection",
"features":[{"type":"Feature",
"id":"56679924",
"geometry":{"type":"Point",
"coordinates":[-77.0592213018017,38.90222845310455]},
"properties":{"OBJECTID":56679924,"ID":72,
"ADDRESS":"Georgetown Harbor / 30th St NW",
"TERMINAL_NUMBER":"31215",
"LATITUDE":38.902221,"LONGITUDE":-77.059219,
"INSTALLED":"YES","LOCKED":"NO",
"INSTALL_DATE":"2010-10-05T13:43:00.000Z",
"REMOVAL_DATE":null,
"TEMPORARY_INSTALL":"NO",
"NUMBER_OF_BIKES":15,
"NUMBER_OF_EMPTY_DOCKS":4,
"X":394863.27537199,"Y":137153.4794371,
"SE_ANNO_CAD_DATA":null}
},
......'
-- NOTE: This GeoJSON is truncated.
-- Copy full example from https://github.com/Esri/geojson-layer-js/blob/master/data/dc-bike-share.json
INSERT INTO BikeShare(position, ObjectId, Address, Bikes, Docks)
SELECT geography::STGeomFromText('POINT ('+long + ' ' + lat + ')', 4326),
ObjectId, Address, Bikes, Docks
from OPENJSON(#bikeShares, '$.features')
WITH (
long varchar(100) '$.geometry.coordinates[0]',
lat varchar(100) '$.geometry.coordinates[1]',
ObjectId int '$.properties.OBJECTID',
Address nvarchar(200) '$.properties.ADDRESS',
Bikes int '$.properties.NUMBER_OF_BIKES',
Docks int '$.properties.NUMBER_OF_EMPTY_DOCKS' )
I suggest to try Option 2 first.
Note: Consider Geography instead of Geometry if you are using GCS_WGS_1984 projection as is with Bing Maps.

Answer 2

Instead of retrieving GeoJSON from Bing Maps, retrieve Well Known Text: https://www.bing.com/api/maps/sdk/mapcontrol/isdk/wktwritetowkt
Send this to your backend and then use the geometry::stgeomfromtext https://learn.microsoft.com/en-us/sql/t-sql/spatial-geometry/stgeomfromtext-geometry-data-type?view=sql-server-ver15
Note that DbGeometery will not support spatially accurate calculations. Consider storing the data as a DbGeograpgy instead using geography::stgeomfromtext https://learn.microsoft.com/en-us/sql/t-sql/spatial-geography/stgeomfromtext-geography-data-type?view=sql-server-ver15 and pass in '4326' as the SRID.