[Xastir-dev] Davis Weather Station Corrections/hacks

[Gerry Creager N5JXS]

Steve Dimse and FindU created a table for lookup.  I've got one 
somewhere.  The PDE for T/Td/RH conversion isn't worth the effort to track.

There's a simplification out there.  I've gotta find it in the books and 
I'll relate it to you.

It's good enough for what we're doing with APRS-WX and CWOP.

gerry

Curt, WE7U wrote:
> On Sun, 13 Mar 2005, Clay Jackson wrote:
> 
> 
>>The formula for Dew Point is inolves a whole bunch of steps (finding the
>>vapor pressure, then the max vapor pressure, then the difference; some
>>stuff with natural logs) and so I was wondering if Xastir already had
>>support for some sort of table (there are lots of dewpoint tables
>>available, it's basically a 100 x 100 matrix).
> 
> 
> Nope.  No support for tables that I know of.  There aren't any
> formulas for computing these that the tables were derived from?
> 
> 
> 
>>Also, the three hour barometer is an interesting problem - I was
>>thinking of building a table of pressures and times and then just taking
>>the value that was 3 hours old every time I got a new report.   Again,
>>any sort of table/list/array handing already built into Xastir would be
>>good.
> 
> 
> Again, a formula would be better than some tables.  If possible.
> 
> --
> Curt, WE7U.   APRS Client Comparisons: http://www.eskimo.com/~archer
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-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
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