What is the best way to implement cost matrix?

[azerphoenix]

When optimizing routes, I needed to create a cost matrix.
After searching the forum, I found several solutions. Which one is more preferable in view of the accuracy and speed of calculations?

1. Using GreatCircleDistanceCalculator (Haversine)

• GreatCircleDistanceCalculator
  or
• EuclideanDistanceCalculator
  or
• ManhattanDistanceCalculator

2. Using another library or implementing custom solution (for example - Vincenty instead Haversine)

• library - geographiclib

3. Getting distance & time from graphhopper for every pair of coordinates.

• forum thread
  Or are there other preferred ways?

Thanks in advance for your help!

[Tomas_Benedikt]

http://project-osrm.org/docs/v5.24.0/api/#table-service

[azerphoenix]

If I understand you correctly, then you recommend using the OSRM API to implement the cost matrix?
Many thanks

[easbar]

I recommend using the hosted Matrix API: Documentation - GraphHopper Directions API