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Thanks George, good job.A couple of things worth noting;
interpolation, and
rounding.
When you have selected the forecast icon as you've outlined above,
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you're then able to click on a given community for its respective weather forecast.
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The pressure readings displayed at the geotagged communities' centroid have been interpolated, just like the dragged pin marker (right-click Show weather picker) first mentioned by gszlag. Those interpolations, whether for the community centroid location or the dragged pin marker weather picker, are determined between the locations of the nearest controlling data points. In order to reveal those controlling data points, you'll need to switch from forecast to display wind or temp.
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Hover your mouse over the displayed wind (or temp) value to reveal information on the control point which is in effect a vertex in an irregular triangular network which forms the basis of the interpolations for the communities, dragged pin markers, etc.
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Thank goodness windy.com isn't using data from Weather Underground!!, but instead is using vetted data points for their interpolations. Yay windy.com!!
The matter of rounding is something else to keep in mind when the barometric sensor, e.g., for the Fine Offset/ Ambient Weather Osprey has 1) a stated accuracy of ± 0.08 inHg when it's between 27.13 and 32.50 inHg (at unstated temperature); and 2) the resolution of its reading being 0.01 inHg. Is FineOffset rounding at all? Either way, I'm inclined to round the WS-2902A's display to the nearest 0.1 inHg or 1 hPa
In making our comparisons, the question of how is the rounding being performed and from
what value, is something else to consider. For example an AWOS using a Vaisala Barocap PTB330 with its stated accuracy of ± 0.10 hPa (Class A, resolution 0.01hPa), or ± 0.20 hPa (Class B, resolution 0.1hPa) when it's between 500 and 1100 hPa at 20 °C, and the METAR /MESO reports pressure to the nearest 0.01 inHg or 0.1 hPa
The differences between these two examples are in one case like making a silk purse from a very fine and respectable sow's ear; and in the other, making a silk purse from silk. But as you've proven, George, adjustments made after an analysis of the data collected over an extended period of time from the Osprey can yield statistically impressive results.
Two green thumbs up to you!One of the handy apps on my phone and tablet:
Unit Converter Pro - great for a quick calc
0.01 inHg = 0.338639 hPa
0.1 hPa = 0.002953 inHg
1.0 hPa = 0.02953 inHg
Rounding, one example
29.66 inHg = 1004.40273 hPa <- logically rounds down to 1004
1004 hPa = 29.648107 inHg <- logically rounds up to 29.65