public override async Task <DbGeography> GetGeographyAsync(int ordinal, CancellationToken cancellationToken)
{
EnsureGeographyColumn(ordinal);
var geogBytes = await _reader.GetFieldValueAsync <SqlBytes>(ordinal, cancellationToken);
var providerValue = _sqlGeographyFromBinaryReader.Value(new BinaryReader(geogBytes.Stream));
return(SqlSpatialServices.Instance.GeographyFromProviderValue(providerValue));
}