两点之间的 PLSQL 距离

Question

希望有任何指针，我需要在 PLSQL 中找到经度和纬度点集之间的距离。 有没有一个公式可以插入长和拉特的变量？ 谢谢 加夫

Answer 1

很久以前，我一直在寻找用坐标计算距离的方法，它有很大帮助： 距离内的甲骨文空间搜索

我的测试查询：

SELECT  a.LATITUDE, a.LONGITUDE, a.distance FROM
(
SELECT i.LATITUDE, i.LONGITUDE, calc_distance(i.LATITUDE, i.LONGITUDE, b.mylat, b.mylng) AS distance
--https://www.google.com/maps/place/Parque+Nacional+da+Chapada+Diamantina/@-12.9838169,-42.6544937,8.13z/data=!4m5!3m4!1s0x74221bc4b6315bf:0x5b6f59531dd4b9bd!8m2!3d-12.5800309!4d-41.701355
FROM (SELECT -12.9838169 LATITUDE, 
-42.6544937 LONGITUDE
FROM dual
) i
JOIN (
--https://www.google.com/maps/@-25.0814262,-48.7200207,10z
SELECT -25.0814262 AS mylat,
-48.7200207 AS mylng,
3.1415926 AS pi, 
6371.4 earthradius
FROM DUAL
)b ON (1 = 1)
)a

我不知道它是否适合任何坐标，但在我的测试中距离是精确的。 要验证：https://www.sunearthtools.com/pt/tools/distance.php

链接中的函数：

CREATE OR REPLACE FUNCTION calc_distance(
pLat1 NUMBER,
pLon1 NUMBER,
pLat2 NUMBER,
pLon2 NUMBER)
RETURN NUMBER
IS
-- r is the spherical radius of earth in Kilometers
cSpherRad CONSTANT NUMBER := 6367;
  -- The spherical radius of earth in miles is 3956
a        NUMBER;
vLat     NUMBER;
vLat1Rad NUMBER;
vLat2Rad NUMBER;
vLon     NUMBER;
vLon1Rad NUMBER;
vLon2Rad NUMBER;
BEGIN
/*
Most computers require the arguments of trigonometric functions to be
expressed in radians. To convert lon1, lat1 and lon2,lat2 from
degrees,minutes, seconds to radians, first convert them to decimal
degrees. To convert decimal degrees to radians, multiply the number
of degrees by pi/180 = 0.017453293 radians/degrees.
*/
vLat1Rad := pLat1 * 0.017453293;
vLat2Rad := pLat2 * 0.017453293;
vLon1Rad := pLon1 * 0.017453293;
vLon2Rad := pLon2 * 0.017453293;
vLon := vLon2Rad - vLon1Rad;
vLat := vLat2Rad - vLat1Rad;
a := POWER(SIN(vLat/2),2) + COS(vLat1Rad) * COS(vLat2Rad) *
POWER(SIN(vLon/2),2);
/*
The intermediate result c is the great circle distance in radians.
Inverse trigonometric functions return results expressed in radians.
To express c in decimal degrees, multiply the number of radians by
180/pi = 57.295780 degrees/radian.
The great circle distance d will be in the same units as r.
*/
RETURN ROUND(cSpherRad * 2 * ATAN2(SQRT(a), SQRT(1-a)),1);
EXCEPTION
WHEN OTHERS THEN
RETURN 999;
END calc_distance;