What free services exist for calculating distances between coordinates on a map?

Question

OpenStreetMap

Good day, colleagues. Consult, please. Are there any services / engines that allow you to calculate the distances between coordinates using, for example, api. Not osrm/YOURS/openrouterservice (requiring own resources) and not commercial. Approximately several million points. The accuracy of the calculation is not critical.

Answer 1

Why do you need third party services? If there are coordinates at the input, then you can use locally either https://gdal.org/
If the points are already in postgres, then install postgis and there all the necessary functions right in the database. At least count on the fly, at least aggregate.
I can write you personally such a web service inexpensively =)

Answer 2

Math is free. The formula for calculating the length on a sphere (accuracy is not important to you) was derived a thousand years ago.

Answer 3

SQL DBMS with OpenGIS support have the functionST_Distance()

Answer 4

honestly stole the code:

// Радиус земли
define('EARTH_RADIUS', 6372795);
 
/*
* Расстояние между двумя точками
* $φA, $λA - широта, долгота 1-й точки,
* $φB, $λB - широта, долгота 2-й точки
* Написано по мотивам http://gis-lab.info/qa/great-circles.html
* Михаил Кобзарев <[email protected]>
*
*/
function calculateTheDistance ($φA, $λA, $φB, $λB) {
 
// перевести координаты в радианы
$lat1 = $φA * M_PI / 180;
$lat2 = $φB * M_PI / 180;
$long1 = $λA * M_PI / 180;
$long2 = $λB * M_PI / 180;
 
// косинусы и синусы широт и разницы долгот
$cl1 = cos($lat1);
$cl2 = cos($lat2);
$sl1 = sin($lat1);
$sl2 = sin($lat2);
$delta = $long2 - $long1;
$cdelta = cos($delta);
$sdelta = sin($delta);
 
// вычисления длины большого круга
$y = sqrt(pow($cl2 * $sdelta, 2) + pow($cl1 * $sl2 - $sl1 * $cl2 * $cdelta, 2));
$x = $sl1 * $sl2 + $cl1 * $cl2 * $cdelta;
 
//
$ad = atan2($y, $x);
$dist = $ad * EARTH_RADIUS;
 
return $dist;
}
$lat1 = 77.1539;
$long1 = -139.398;
$lat2 = -77.1804;
$long2 = -139.55;
 
echo calculateTheDistance($lat1, $long1, $lat2, $long2) . " метров";
// Вернет "17166029 метров"

Answer 5

Service for calculating 2 + 2 is not needed? And that is, I have