东向北至纬度经度 [英] Easting northing to latitude longitude

问题描述

我有东/北格式的位置坐标，但我需要将其转换为适当的纬度，以便在 bing 地图中居中.任何公式或详细信息如何将东/北转换为纬度/经度?

I've got coordinates of location in easting/northing format but I need to convert it to proper lat long to center it in bing maps. Any formula or details how to convert easting/northing to lat/lon?

更具体地说，我需要将 SVY21 坐标转换为 WGS84

To be more specific, I need to convert SVY21 coordinates to the to WGS84

推荐答案

东距和北距分别是基点的东距和北距.基点通常是纬度和经度，东向和北向通常以米或英尺表示.然而，东移和北移通常会偏移一个特定的值，以使它们为正，并允许它们表示基点以西和以南的位置.

Eastings and northings are distances east and north, respectively, of a base point. The base point is usually a latitude and longitude, and eastings and northings are normally expressed in meters or feet. The easting and northing, however, is usually offset a particular value to make them positive and allow them to express places west and south of the base point.

一般来说，从一个坐标系转换到另一个坐标系并不简单，因为两者可能有不同的椭球体(地球模型)和基准面.据我了解，从一个坐标系转换到另一个坐标系的公式相当复杂.

In general, converting from one coordinate system to another is not simple, since both may have different ellipsoids (Earth models) and datums. As I understand, the formulas for converting from one coordinate system to another are rather complex.

SVY21 使用与 WGS84 完全相同的基准面和椭球，使得任务更简单.在 SVY21 中，东向和北向的基点是 Base 7 at Pierce Reservoir，1 度.22 分钟.02.9154 秒.北纬103度.49 分 31.9752 秒.东(即大约 1.3674765 度的纬度和大约 103.8255487 度的经度；然而，众所周知的文本分别使用 1.3666... 度和 103.8333... 度).东距偏移量为 28001.642 米，北距偏移量为 38744.572 米.EPSG 代码是 3414.我假设您的东向和北向以米表示.

SVY21, however, uses the exact same datum and ellipsoid as WGS84, making the task simpler. In SVY21, the base point for eastings and northings is Base 7 at Pierce Reservoir, 1 deg. 22 min. 02.9154 sec. North and 103 deg. 49 min 31.9752 sec. East (that is, a latitude of about 1.3674765 degrees and a longitude of about 103.8255487 degrees; the well known text, however, uses 1.3666... degrees and 103.8333... degrees, respectively). The offset for the easting is 28001.642 meters, and the offset for the northing is 38744.572 meters. The EPSG code is 3414. I will assume your eastings and northings are expressed in meters.

由于 SVY21 使用与 WGS84 相同的系统，您所要做的就是:

Since SVY21 uses the same system as WGS84, all you have to do is:

• 用各自的偏移值减去东距和北距.(数值以米为单位.)
• 根据给定的基点、东距的绝对值以及东距为正时的方位角为 90 度，如果为负时为 270 度，求出给定点的经度.这种计算称为解决直接测地线问题"，这在 C.F.F.Karney 的文章测地线算法，2012.
• 通过在给定基点、北距的绝对值以及北距为正时的 0 度或负时为 180 度的方位角中找到给定点的纬度.

这篇关于东向北至纬度经度的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！