[wxqc] Rain graph not displaying value

[Armin Schwarz]

Interesting and makes sense, thanks. I will change the program to report 
the recommended values.

Armin.


Steve Dimse wrote:

>On Aug 19, 2007, at 8:20 PM, Armin Schwarz wrote:
>
>  
>
>>I noticed that the rain graph on my findu page does never display any
>>values other than zero eventhough the header line "Last report  
>>from ..."
>>does display the "Rain last 24hrs x.xx inches" as uploaded.
>>    
>>
>
>APRS has four rain values, cumulative (limited to Peet stand-alone  
>weather stations) 1 hour, local midnight, and 24 hour. Last 24 hours  
>is not displayed graphically, as it makes a very confusing image.  
>Whether the line goes up or down at each time bin depends on two  
>values, the rain that has fallen now, and the rain which fell 24  
>hours ago.
>
>Think about a 48 hours of constant rain at .1 inch/hour. For 24 hours  
>the graph is a ramp up, then it is level for 24 hours, then it ramps  
>down for 24 hours. While ramping down there is no rain, but the graph  
>still shows a value. While the ramp is up and while it is level, it  
>is raining. Now imagine 24 hours of 0.1 inch/hr, then 24 hours of .2  
>inch per hour. Now the graph is a straight ramp for the full 48  
>hours, even though the rate changed halfway through. In other words,  
>to make sense of the 24 hour parameter, you have to look at all the  
>data over the las 24 hours to figure out the current rain. Graphs are  
>supposed to make data easier to interpret, graphing 24 hour rain  
>makes it harder. One hour is a little better because of the shorter  
>term, but it still suffers from the same problem on a local time scale.
>
>I don't know which software you are using, but you should beg the  
>program author to modify it to send the rain since local midnight  
>data as well as the 24 hour data. With rain since local midnight,  
>anytime the level goes up more rain has fallen, and the daily reset  
>is very clear.
>
>Steve K4HG
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