空间查询，将米转换为弧度？

发布于 2024-09-06 22:22:40 字数 305 浏览 1 评论 0原文

我有已加载到地理数据类型中的地理数据。出于非常具体的目的，我现在需要将其存储为几何图形。但是，我需要执行这样的查询。

DECLARE @radius INT -- e.g. 3000 metres

DECLARE @geo geometry -- my starting shape

SET @geo = @geo.STBuffer(@radius) -- this obviously doesnt work.. 

SELECT Geo FROM GeometryTable 
WHERE Geo.STWithin (@geo) = 1

原文

I have geographic data that was loaded into the geography datatype. For very specific purposes, I now need to have store this as a geometry. However, I need to perform a query like this.

DECLARE @radius INT -- e.g. 3000 metres

DECLARE @geo geometry -- my starting shape

SET @geo = @geo.STBuffer(@radius) -- this obviously doesnt work.. 

SELECT Geo FROM GeometryTable 
WHERE Geo.STWithin (@geo) = 1

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幽蝶幻影 2024-09-13 22:22:40

米是长度的单位，而弧度是角度的单位，所以我认为你不能。

您想计算弧长吗？

请查看以下链接：

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§对你不离不弃 2024-09-13 22:22:40

如果有人可以验证该技术或提供更好的替代方案，那么这个技巧可能会起作用，那么他们就会得到可接受的答案。

基本上，我想我可以使用地理的 STBuffer，它将在我的地理形状周围应用正确的半径（以米为单位），然后转换回几何形状。由于形状最初是作为地理加载的，因此所有点都是相同的。这种形状翻转应该会给我一个结果几何图形，周围有一个非常准确的缓冲区。

DECLARE @radius INT -- e.g. 3000 metres

DECLARE @geo geometry -- my starting shape

SET @geo = GEOMETRY::STGeomFromWKB(GEOGRAPHY::STGeomFromWKB(@geo.STAsBinary(),
           4326).STBuffer(@radius).STAsBinary(),4326)

SELECT Geo FROM GeometryTable 
WHERE Geo.STWithin (@geo) = 1

This trick might work, if someone can validate this technique or provide a better alternative then they'll get the accepted answer.

Basically, I am thinking I can use the STBuffer of a geography which will apply the correct radius in metres around my geographical shape and then I convert back to a geometry. As the shapes were loaded originally as geography all the points are the same. This shape-flip should give me a resulting geometry with a pretty accurate buffer around it.

DECLARE @radius INT -- e.g. 3000 metres

DECLARE @geo geometry -- my starting shape

SET @geo = GEOMETRY::STGeomFromWKB(GEOGRAPHY::STGeomFromWKB(@geo.STAsBinary(),
           4326).STBuffer(@radius).STAsBinary(),4326)

SELECT Geo FROM GeometryTable 
WHERE Geo.STWithin (@geo) = 1

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