I am nerding out calibrating my barometer today. I have a handheld
precision barometer that I can take co a vertical survey marker close to
a nearby major airport. I can then call the automated message at the
tower and get real time AS (altimeter settings) from the airport
barometer. I just am not sure what height these AS settings are
referenced to. There are two listed in the marker's datasheet. Ortho
and Ellipsoid. Ortho is based on spirit leveling and a better reference
to a hypothetical equipotential surface that is tied to one tide station
in Quebec (NAVD88) or the GPS measured Ellipsoid (a simple oblate sphere
that is supposed to approximate said equipotential surface). The nice
thing about doing this is that I can precisely know the height of my WX
station at home. I know it within about 5 feet, but not certain until I
take use an average over time of this AS from the local airport. I
don't have a super expensive Surveyor GPS to determine it. I do have a
surveyors tansit, but I am thinking doing a closed lip with it from a
local vertical control is way overkill even though this stuff is fun to
me :D
I hope there is someone that is into surveying nerdiness that can answer
this question. If not, I will have to email the local skywarn contact
meteorologist and bug him.
Regards,
Chris Maness
--
You received this message because you are subscribed to the Google Groups
"weewx-user" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/weewx-user/50abb7a0-0fc2-fc0c-56ff-3d6e034451af%40gmail.com.
OpenPGP_0x55BE65AD1B41D696.asc
Description: application/pgp-keys
OpenPGP_signature
Description: OpenPGP digital signature
