Efficiency

[UODLD1]

Hi,
I have been looking at the data on the lightning maps website, and I was just wondering if anyone knows what and how the efficiency of the station is calculated?
Thanks. Kerri

[Knickohr]

No answer ?

I'm also interested in how this value is calculated.

Thomas

[Tobi]

Efficiency = sqrt( stroke_ratio * signal_ratio )

[Knickohr]

That's not correct

After some experience I found :

Efficiency[%] = sqrt( quota_strokes_per_h[%] * quota_signals_per_h[%] )

Efficiency[%] = sqrt( stroke_ratio[%] * locating_ratio[%] )

or better :

Efficiency[%] = sqrt( ( strokes_station / stokes_summary ) * ( strokes_station / signals_station ) ) * 100

Efficiency[%] = sqrt( strokes_station² / (strokes_summary * signals_station ) ) * 100

Is this correct ?

Thomas

[andyweather]

i can say i'm happy with my efficiency.

[Tobi]

That's not correct

Oops, sorry.  You are right!

[Egon]

Hi Folks,

I have changed the computation of the effectivity shown in the station list at blitzortung.org (this is not the efficiency of lightningmaps.org you have discussed above). The time period is 1 hour. I need the following notations to explain the computation.

Strikes (x,s) = number of strikes in a rage of x km to station s

Hits (x,s) =  number of strikes in a range of x km to station s at that station s was involved

Signals (s) = number of signals of station s

Strikes = total number of computed strikes of the region to that the station sends data

min (x,y) = minimum of x and y


Then we have:

Effectivity_50 = Hits (s,50) / Strikes (s,50) * min (Strikes / Signals (s), Signals (s) / Strikes)

Effectivity_500 = Hits (s,500) / Strikes (s,500) * min (Strikes / Signals (s) /, Signals (s) / Strikes)

Effectivity_5000 = Hits  (s,5000) / Strikes(s,5000) * min (Strikes / Signals (s), Signals (s) / Strikes)

If a denominator is zero, the effectivity is zero.


This is the old effectivity value multiplied by the factor min (Strikes / Signals(s), Signals(s) / Strikes) to consider also the strikes/signals relation (and to punish the stations that send a lot of trash  ).

The effectivity should only be considered as a relative measure of the performance, although a value of 1 can be obtained.

Much fun,
Egon

[Knickohr]

Thats very interesting Egon !

Some days ago, I do some experience with this :

http://forum.blitzortung.org/showthread....28#pid9628

Thats not exactly the same, but the result is nearly identical. Good performing stations are "playing" in the middle of the x-axis with high efficiency on lightningmaps.org (on the top of the "mountain"). But now, if you calculate the efficiency in another way, I have to look, if my graph is already up to date.

Thomas

[Gerhard.Wittevee]

Hi Folks,

I have changed the computation of the effectivity shown in the station list at blitzortung.org (this is not the efficiency of lightningmaps.org you have discussed above). The time period is 1 hour. I need the following notations to explain the computation.

Strikes (x,s) = number of strikes in a rage of x km to station s

Hits (x,s) =  number of strikes in a range of x km to station s at that station s was involved

Signals (s) = number of signals of station s

Strikes = total number of computed strikes of the region to that the station sends data

min (x,y) = minimum of x and y


Then we have:

Effectivity_50 = Hits (s,50) / Strikes (s,50) * min (Strikes / Signals (s), Signals (s) / Strikes)

Effectivity_500 = Hits (s,500) / Strikes (s,500) * min (Strikes / Signals (s) /, Signals (s) / Strikes)

Effectivity_5000 = Hits  (s,5000) / Strikes(s,5000) * min (Strikes / Signals (s), Signals (s) / Strikes)

If a denominator is zero, the effectivity is zero.


This is the old effectivity value multiplied by the factor min (Strikes / Signals(s), Signals(s) / Strikes) to consider also the strikes/signals relation (and to punish the stations that send a lot of trash  ).

The effectivity should only be considered as a relative measure of the performance, although a value of 1 can be obtained.

Much fun,
Egon

Hi Egon,

I get the general idea of the new computation (quite hard for someone one who sucs at maths...)  But i am trying to figure out what the Y in "min (x,y) = minimum of x and y" stands for. I thought i'd just ask .

Gerhard

[Knolau]

This is the old effectivity value multiplied by the factor min (Strikes / Signals(s), Signals(s) / Strikes) to consider also the strikes/signals relation (and to punish the stations that send a lot of trash  ).

Hi Egon.

I think it´s a good idea to punish station with bad effiency, but i do not understand, what this factor is. If i look in the stations list i see my station has sometimes not so good efficiency, although there are some signals and many lightning strikes. 
I have (mostly around the weekend) short periods with a lot of noise, often only once a day. Is that the reason for worse efficiency? Is the time period of your factor 1 day or longer?

Cheers

Knolau