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| author | Gary E. Miller <gem@rellim.com> | 2016-07-25 12:06:43 -0700 |
|---|---|---|
| committer | Gary E. Miller <gem@rellim.com> | 2016-07-25 12:06:43 -0700 |
| commit | f42e7ea230d1e0040e29ced54c9b13d140e30e09 (patch) | |
| tree | 68b9bb44c0ead892a55b509a562517ebed7bfecd /gps | |
| parent | 7d795276794a131df93dfc89194de6d596b3fe24 (diff) | |
| download | gpsd-f42e7ea230d1e0040e29ced54c9b13d140e30e09.tar.gz | |
Add comments on EarthDistance computations.
Funny, in Texas a foot is not the same as everywhere else!
Diffstat (limited to 'gps')
| -rw-r--r-- | gps/misc.py | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gps/misc.py b/gps/misc.py index ac083612..9aaf151b 100644 --- a/gps/misc.py +++ b/gps/misc.py @@ -70,6 +70,9 @@ else: # Otherwise we do something real # some multipliers for interpreting GPS output +# Note: A Texas Foot is ( meters * 3937/1200) +# (Texas Natural Resources Code, Subchapter D, §21.071 – 79) +# not the same as an international fooot. METERS_TO_FEET = 3.28083989501312 # Meters to U.S./British feet METERS_TO_MILES = 0.000621371192237334 # Meters to miles METERS_TO_FATHOMS = 0.546806649168854 # Meters to fathoms @@ -80,6 +83,9 @@ MPS_TO_KPH = 3.6 # Meters per second to klicks/hr MPS_TO_MPH = 2.2369362920544 # Meters/second to miles per hour MPS_TO_KNOTS = 1.9438444924406 # Meters per second to knots +# for high precision the geoid height should be used. +# this code does not do that, + # EarthDistance code swiped from Kismet and corrected |