Ruby
Compute the Distance Between Two Latitude/Longitudes - Haversine Formula in Ruby
12/16/08 18:37
Synopsis: Haversine formula in
Ruby. This is Ruby code to compute the
distance between two points when their position is
given as a latitude and longitude. It’s very handy
and I used it to compute an absolute distance to
signal strength graph using a GPS and custom code I
wrote which could read signal strength from a
embedded WiFi device I was
testing. The test was undertaken to determine
the signal strength vs distance
characteristics in the field of a LANtronix Matchport b/g.
This article answers the question: How to
compute the distance between two GPS
coordinates using Ruby?
Here’s one of many resulting graphs (gnuplot) based on lat/lon points, ping latency, and signal strength. There were many more graphs and tests done, but this gives you an idea of what the Haversine formula is good for. For every lat/lon I took a signal strength reading (automated of course.) Using the Haversine formula coded in Ruby, presented below, I could easily compute the distance between points to create a signal strength to distance graph. Those distances comprised the X axis of this graph of Signal Strength and Ping latency vs Distance in feet:
Here’s one of many resulting graphs (gnuplot) based on lat/lon points, ping latency, and signal strength. There were many more graphs and tests done, but this gives you an idea of what the Haversine formula is good for. For every lat/lon I took a signal strength reading (automated of course.) Using the Haversine formula coded in Ruby, presented below, I could easily compute the distance between points to create a signal strength to distance graph. Those distances comprised the X axis of this graph of Signal Strength and Ping latency vs Distance in feet:
asdfasdf
