将浮动纬度和经度转换为地理位置

Question

如何将浮动纬度和经度值转换为地理类型值？我有@lat和@lon个变量。

Answer 1

使用案例陈述：

CASE
    WHEN ((@Latitude IS NOT NULL) AND (@Longitude IS NOT NULL))
    THEN geography::Point(@Latitude, @Longitude, 4326)
    ELSE NULL           
END

或if：

的变体

 DECLARE @Location geography = NULL
 IF (@Latitude IS NOT NULL AND @Longitude IS NOT NULL)
    SET @Location = geography::Point(@Latitude, @Longitude, 4326);

Answer 2

我自己找到了解决方案：

geography::STPointFromText(
    'POINT(' + CAST(@lon AS VARCHAR(20)) + ' ' + CAST(@lat AS VARCHAR(20)) + ')', 4326)