Back on the topic for a tic [ You are not allowed to view attachments ]
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1) WU asks for both the height of the instrument, anemometer from the looks of the little illustration, and also asks for an elevation. Implicitly (?) this elevation would be at grade of the sensor array. Datum doesn't seem to matter. Oh, and before I forget it again (CRS!), the difference between NAVD88 and NGVD29 varies from place to place. For us here in coastal Hancock County, the difference between these two terrestrial datum is less than 0.7', while elsewhere in the U.S., you'll find differences over three feet. Here's a couple of examples, but I encourage those interested in learning of the difference for their own locality to use
VDatum - after the hostage situation has ended. For example:
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2) PWSWeather asks for an elevation and almost explicitly (ref. TopoZone link) is asking for an elevation at grade of the sensor array. No specific terrestrial datum is specified.
3) Weathercloud also appears to be requesting for a ground elevation for the sensor array, but they're using the word "Altitude" for reasons unclear. They also ask for the height of the PWS. No specific terrestrial datum is specified.
4) Ambient Weather isn't particularly interested in the elevation of grade for the sensor array or the height of anything. I asked Ambient for clarity and got this reply:
VKB: "
Does AmbientWeather.net use elevation information? I can't find anywhere in the Dashboard that reflects height of instrument, grade elevation at instrument, or height of barometer.
Thanks
Kelly"
AW: "
Nope. The calibration is done on the console with an offset.
Ed"
5) AWEKAS asks for elevation above sea level with its tool tip saying "Indicates the altitude of the station or measuring point." No specific terrestrial datum is specified.
6) CWOP appears to also want the elevation at grade of the sensor array; however, the referencing links in the CWOP FAQs that I chased after are old and returned 404 errors. No specific terrestrial datum is specified from what I saw.
From everything that members have posted above, and elsewhere on this forum, and from what might get pieced together from looking at the above cited online services, elevations, irrespective of a specific terrestrial datum, related to the PWS are primarily located at grade of the outdoor sensor array.
Confession: In addition to an elevation at grade being sought, my inner nerd child was imagining it worth considering the heights of other things, like each of the sensors individually, e.g., rain gauge, thermometer, barometer, anemometer, and further, some note of the proximity and nature of nearby air current obstructions. I guess that's a tad overboard