### Re: Dead straight lines on hitmaps.

Posted:

**Sat Aug 08, 2015 3:36 am**The analysis of "how straight a hit-line is" is in fact interesting, and I wonder what are the straightest lines so far. (Notice that, on the hitmap, a line may be dead straight even if the coordinates are not that similar; also, with very similar coordinates, an unlucky hit may have a line that is not dead straight — I also wonder if anyone can find one of those.)

Actually, your figures are not correct, vermeer, because you compounded the distances at the origin instead of measuring the distance at the destination, as it should be. What you want to measure is "if the note went vertical / horizontal, how far would it be at the destination?" A very good measure for that is the "Initial bearing" of the link you provided.

So, for the hit you linked to (Singen to Reinheim), the distance is 413 m and the Initial bearing is 359.897º (that is, a 0.0286% slope). For the Finland to Greece one, the numbers are 3,019 m / 179.9352º / 0.0360%. For the Galway to Groningen one, it's 5,231 m / 84.0092º / 6.6564%.

Of course, it's only minor differences from your numbers and the same idea remains: that your Galway to Groningen hit is

Actually, your figures are not correct, vermeer, because you compounded the distances at the origin instead of measuring the distance at the destination, as it should be. What you want to measure is "if the note went vertical / horizontal, how far would it be at the destination?" A very good measure for that is the "Initial bearing" of the link you provided.

So, for the hit you linked to (Singen to Reinheim), the distance is 413 m and the Initial bearing is 359.897º (that is, a 0.0286% slope). For the Finland to Greece one, the numbers are 3,019 m / 179.9352º / 0.0360%. For the Galway to Groningen one, it's 5,231 m / 84.0092º / 6.6564%.

Of course, it's only minor differences from your numbers and the same idea remains: that your Galway to Groningen hit is

*not that impressive*.