* On 2021 10 Jan 20:02 -0600, Tom Keffer wrote: > The note *Derived variables > <https://www.davisinstruments.com/product_documents/weather/app_notes/AN_28-derived-weather-variables.pdf>* > from > Davis has a pretty good discussion of this.
Thanks, Tom.
I have a Vantage Pro2 and I see this:
$ sudo wee_device --info
Using configuration file /etc/weewx/weewx.conf
Using Vantage driver version 3.2.1 (weewx.drivers.vantage)
Querying...
Davis Vantage EEPROM settings:
CONSOLE TYPE: Vantage Pro2
CONSOLE FIRMWARE:
Date: Jun 3 2013
Version: 3.15
CONSOLE SETTINGS:
Archive interval: 300 (seconds)
Altitude: 1327 (foot)
Wind cup type: large
Rain bucket type: 0.01 inches
Rain year start: 1
Onboard time: 2021-01-11 04:37:42
CONSOLE DISPLAY UNITS:
Barometer: inHg
Temperature: degree_F
Rain: inch
Wind: mile_per_hour
CONSOLE STATION INFO:
Latitude (onboard): +39.9
Longitude (onboard): -96.8
Use manual or auto DST? AUTO
DST setting: N/A
Use GMT offset or zone code? ZONE_CODE
Time zone code: 6
GMT offset: N/A
Temperature logging: LAST
Retransmit channel: OFF (0)
TRANSMITTERS:
Channel Receive Repeater Type
1 active none iss
2 active none temp (as extra temperature 1)
3 active none (N/A)
4 active none (N/A)
5 active none (N/A)
6 active none (N/A)
7 active none (N/A)
8 active none (N/A)
RECEPTION STATS:
Total packets received: 6411
Total packets missed: 90
Number of resynchronizations: 0
Longest good stretch: 751
Number of CRC errors: 12
BAROMETER CALIBRATION DATA:
Current barometer reading: 30.344 inHg
Altitude: 1327 feet
Dew point: 23 F
Virtual temperature: 29 F
Humidity correction factor: 0.7
Correction ratio: 1.052
Correction constant: -0.024 inHg
Gain: 0.000
Offset: -24.000
OFFSETS:
Wind direction: +0 deg
Inside Temperature: +0.0 F
Inside Humidity: +0 %
Outside Temperature: +0.0 F
Outside Humidity: +0 %
Extra Temperature 1: +0.0 F
In this case, 1327 feet is the height of the console including its
height above ground level which is stated to be 1318 feet by Google
Earth and topographical map estimation.
The closest airport with a reporting station is about eight miles
east/southeast from here and I have the console set to match its
pressure reading as shown on its NWS page. Its elevation is stated to
be 1283 feet, so 44 feet lower than my console.
I've never been exactly clear from the Davis documentation just who I
should be doing. My guess is that the 44 feet and eight mile difference
is probably inconsequential on a clear sunny day like this. The
difference likely is greater under more localized conditions such as
when a squall line moves through.
My goal is to "color" my data as little as possible and my station does
report to CWOP and seems to get satisfactory marks from MADIS.
- Nate
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