wind speed and gusts discrete values?

[Paolo Benvenuto]

The attacched image of my wind speed and gusts from vantage vue show something weird:

- on the left wind speed and gusts are discrete, with increments of 1.6 kph, which is 1 mph: this would be related to the discretness of the reading of the vantage vue?

- from 15.30 on, wind speed values become continous. I know I restarted weewx after making some change, but I don't know what change is responsible of removing the discretness of wind speed

- is there a way to remove discretness of wind gusts too?

[gjr80]

You didn't change record_generation under [StdArchive] in weewx.conf from hardware to software did you? It might help to see weewx.conf, if you do post weewx.conf make sure you remove any sensitive info first.

Gary

[Paolo Benvenuto]

Here is my weewx.conf:

# WEEWX CONFIGURATION FILE

#

# Copyright (c) 2009-2015 Tom Keffer <*****@gmail.com>

# See the file LICENSE.txt for your rights.

##############################################################################

# This section is for general configuration information.

# Set to 1 for extra debug info, otherwise comment it out or set to zero

debug = 1

# Root directory of the weewx data file hierarchy for this station

WEEWX_ROOT = /

# How long to wait before timing out a socket (FTP, HTTP) connection

socket_timeout = 20

# Do not modify this. It is used when installing and updating weewx.

version = 3.8.2

##############################################################################

#   This section is for information about the station.

[Station]

    

    # Description of the station location

    location = "Genova Cornigliano"

    

    # Latitude and longitude in decimal degrees

    latitude = 44.41547

    longitude = 8.87302

    

    # Altitude of the station, with unit it is in. This is downloaded from

    # from the station if the hardware supports it.

    altitude = 10, meter

    

    # Set to type of station hardware. There must be a corresponding stanza

    # in this file with a 'driver' parameter indicating the driver to be used.

    station_type = Vantage

    

    # The start of the rain year (1=January; 10=October, etc.). This is

    # downloaded from the station if the hardware supports it.

    rain_year_start = 1

    

    # Start of week (0=Monday, 6=Sunday)

    week_start = 0

    

    # If you have a website, you may specify an URL

    station_url = http://weewx.qumran2.net

##############################################################################

[Vantage]

    # This section is for the Davis Vantage series of weather stations.

    

    # Connection type: serial or ethernet 

    #  serial (the classic VantagePro)

    #  ethernet (the WeatherLinkIP)

    type = serial

    

    # If the connection type is serial, a port must be specified:

    #   Debian, Ubuntu, Redhat, Fedora, and SuSE:

    #     /dev/ttyUSB0 is a common USB port name

    #     /dev/ttyS0   is a common serial port name

    #   BSD:

    #     /dev/cuaU0   is a common serial port name

    port = /dev/ttyUSB0

    

    # If the connection type is ethernet, an IP Address/hostname is required:

    host = 1.2.3.4

    

    ######################################################

    # The rest of this section rarely needs any attention. 

    # You can safely leave it "as is."

    ######################################################

    

    # Serial baud rate (usually 19200)

    baudrate = 19200

    

    # TCP port (when using the WeatherLinkIP)

    tcp_port = 22222

    

    # TCP send delay (when using the WeatherLinkIP):

    tcp_send_delay = 0.5

    

    # The id of your ISS station (usually 1). If you use a wind meter connected

    # to a anemometer transmitter kit, use its id

    iss_id = 1

    

    # How long to wait for a response from the station before giving up (in

    # seconds; must be greater than 2)

    timeout = 4

    

    # How long to wait before trying again (in seconds)

    wait_before_retry = 1.2

    

    # How many times to try before giving up:

    max_tries = 4

    

    # Vantage model Type: 1 = Vantage Pro; 2 = Vantage Pro2

    model_type = 2

    

    # The driver to use:

    driver = weewx.drivers.vantage

##############################################################################

#   This section is for uploading data to Internet sites

[StdRESTful]

    

    [[StationRegistry]]

        # To register this weather station with weewx, set this to true

        register_this_station = true

    

    [[AWEKAS]]

        # This section is for configuring posts to AWEKAS.

        

        # If you wish to do this, set the option 'enable' to true,

        # and specify a username and password.

        enable = true

        username = ***

        password = ****

    

    [[CWOP]]

        # This section is for configuring posts to CWOP.

        

        # If you wish to do this, set the option 'enable' to true,

        # and specify the station ID (e.g., CW1234).

        enable = true

        station = ****

    

    # If this is an APRS (radio amateur) station, uncomment

    # the following and replace with a passcode (e.g., 12345).

    #passcode = replace_me (APRS stations only)

    

    [[PWSweather]]

        # This section is for configuring posts to PWSweather.com.

        

        # If you wish to do this, set the option 'enable' to true,

        # and specify a station and password.

        enable = true

        station = *****

        password = ******

    

    [[WOW]]

        # This section is for configuring posts to WOW.

        

        # If you wish to do this, set the option 'enable' to true,

        # and specify a station and password.

        enable = false

        station = replace_me

        # To guard against parsing errors, put your password in quotes:

        password = replace_me

    

    [[Wunderground]]

        # This section is for configuring posts to the Weather Underground.

        

        # If you wish to do this, set the option 'enable' to true,

        # and specify a station (e.g., 'KORHOODR3') and password.

        enable = true

        station = **

        password = *****

        

        # Set the following to True to have weewx use the WU "Rapidfire"

        # protocol. Not all hardware can support it. See the User's Guide.

        rapidfire = False

    [[OpenWeatherMap]]

        #username = ***

        #station_name = ****

        #password = ****

        appid = ***

        station_id = ***

##############################################################################

#   This section specifies what reports, using which skins, to generate.

[StdReport]

    

    # Where the skins reside, relative to WEEWX_ROOT

    SKIN_ROOT = /etc/weewx/skins

    

    # Where the generated reports should go, relative to WEEWX_ROOT

    HTML_ROOT = /var/www/html/weewx

    

    # The database binding indicates which data should be used in reports.

    data_binding = wx_binding

    

    # Each of the following subsections defines a report that will be run.

    

    [[StandardReport]]

        # See the customizing guide to change the units, plot types and line

        # colors, modify the fonts, display additional sensor data, and other

        # customizations. Many of those changes can be made here by overriding

        # parameters, or by modifying templates within the skin itself.

        

        # The StandardReport uses the 'Standard' skin, which contains the

        # images, templates and plots for the report.

        skin = Standard

        [[[Units]]]

            [[[[Groups]]]]

                group_altitude = meter

                group_speed2 = meter_per_second2

                group_pressure = mbar

                group_rain = mm

                group_rainrate = mm_per_hour

                group_temperature = degree_C

                group_degree_day = degree_C_day

                group_speed = km_per_hour

    

    [[FTP]]

        # FTP'ing the results to a webserver is treated as just another report,

        # albeit one with an unusual report generator!

        skin = Ftp

        

        # If you wish to use FTP, uncomment and fill out the next four lines.

        #user = replace with the ftp username

        #password = replace with the ftp password; put in quotes to guard against parsing errors.

        #server = replace with the ftp server name, e.g, www.threefools.org

        #path = replace with the ftp destination directory (e.g., /weather)

        

        # Set to True for an FTP over TLS (FTPS) connection. Not all servers

        # support this.

        secure_ftp = False

        

        # To upload files from something other than what HTML_ROOT is set

        # to above, specify a different HTML_ROOT here.

        #HTML_ROOT = /var/www/html/weewx

        

        # Most FTP servers use port 21

        port = 21

        

        # Set to 1 to use passive mode, zero for active mode

        passive = 1

    

    [[RSYNC]]

        # rsync'ing to a webserver is treated as just another report

        skin = Rsync

        

        # Rsync can be configured to remove files from the remote server if

        # they don't exist under HTML_ROOT locally. USE WITH CAUTION: if you

        # make a mistake in the remote path, you could could unintentionally

        # cause unrelated files to be deleted. Set to 1 to enable remote file

        # deletion, zero to allow files to accumulate remotely.

        delete = 0

        

        # If you wish to use rsync, you must configure passwordless ssh using

        # public/private key authentication from the user account that weewx

        # runs as to the user account on the remote machine where the files

        # will be copied.

        #

        # The following three lines determine where files will be sent.

        server = cathopedia.org

        path = /home/paolo/weewx/

        user = ****

##############################################################################

#   This service acts as a filter, converting the unit system coming from

#   the hardware to a unit system in the database.

[StdConvert]

    

    # The target_unit affects only the unit system in the database. Once

    # chosen it cannot be changed without converting the entire database.

    # Modification of target_unit after starting weewx will result in

    # corrupt data - the database will contain a mix of US and METRIC data.

    #

    # The value of target_unit does not affect the unit system for

    # reporting - reports can display US, Metric, or any combination of units.

    #

    # In most cases, target_unit should be left as the default: US

    #

    # In particular, those migrating from a standard wview installation

    # should use US since that is what the wview database contains.

    

    # DO NOT MODIFY THIS VALUE UNLESS YOU KNOW WHAT YOU ARE DOING!

    target_unit = US    # Options are 'US', 'METRICWX', or 'METRIC'

##############################################################################

#   This section can adjust data using calibration expressions.

[StdCalibrate]

    

    [[Corrections]]

        # For each type, an arbitrary calibration expression can be given. 

        # It should be in the units defined in the StdConvert section.

        # Example:

        foo = foo + 0.2

##############################################################################

#   This section is for quality control checks. If units are not specified,

#   values must be in the units defined in the StdConvert section.

[StdQC]

    

    [[MinMax]]

        barometer = 26, 32.5, inHg

        outTemp = -40, 120, degree_F

        inTemp = 10, 120, degree_F

        outHumidity = 0, 100

        inHumidity = 0, 100

        windSpeed = 0, 120, mile_per_hour

        pressure = 24, 34.5, inHg

##############################################################################

#   This section controls the origin of derived values.

[StdWXCalculate]

    

    [[Calculations]]

        # Derived quantities are calculated by this service. Possible values are:

        #  hardware        - use the value provided by hardware

        #  software        - use the value calculated by weewx

        #  prefer_hardware - use value provide by hardware if available,

        #                      otherwise use value calculated by weewx

        

        pressure = prefer_hardware

        barometer = prefer_hardware

        altimeter = prefer_hardware

        windchill = prefer_hardware

        heatindex = prefer_hardware

        dewpoint = prefer_hardware

        inDewpoint = prefer_hardware

        rainRate = prefer_hardware

##############################################################################

#   For hardware that supports it, this section controls how often the

#   onboard clock gets updated.

[StdTimeSynch]

    

    # How often to check the weather station clock for drift (in seconds)

    clock_check = 14400

    

    # How much it can drift before we will correct it (in seconds)

    max_drift = 5

##############################################################################

#   This section is for configuring the archive service.

[StdArchive]

    

    # If the station hardware supports data logging then the archive interval

    # will be downloaded from the station. Otherwise, specify it (in seconds).

    archive_interval = 60

    

    # If possible, new archive records are downloaded from the station

    # hardware. If the hardware does not support this, then new archive

    # records will be generated in software.

    # Set the following to "software" to force software record generation.

    record_generation = software

    

    # Whether to include LOOP data in hi/low statistics

    loop_hilo = True

    

    # The data binding used to save archive records

    data_binding = wx_binding

##############################################################################

#   This section binds a data store to a database.

[DataBindings]

    

    [[wx_binding]]

        # The database must match one of the sections in [Databases].

        # This is likely to be the only option you would want to change.

        database = archive_sqlite

        # The name of the table within the database

        table_name = archive

        # The manager handles aggregation of data for historical summaries

        manager = weewx.wxmanager.WXDaySummaryManager

        # The schema defines the structure of the database.

        # It is *only* used when the database is created.

        schema = schemas.wview.schema

##############################################################################

#   This section defines various databases.

[Databases]

    

    # A SQLite database is simply a single file

    [[archive_sqlite]]

        database_type = SQLite

        database_name = weewx.****.sdb

    

    # MySQL

    [[archive_mysql]]

        database_type = MySQL

        database_name = weewx

##############################################################################

#   This section defines defaults for the different types of databases.

[DatabaseTypes]

    

    # Defaults for SQLite databases

    [[SQLite]]

        driver = weedb.sqlite

        # Directory in which the database files are located

        SQLITE_ROOT = /media/nas.nfs/Documents/weewxdb

    

    # Defaults for MySQL databases

    [[MySQL]]

        driver = weedb.mysql

        # The host where the database is located

        host = localhost

        # The user name for logging in to the host

        user = ****

        # The password for the user name. Put in quotes to guard against parsing errors.

        password = ****

##############################################################################

#   This section configures the internal weewx engine.

[Engine]

    

    [[Services]]

        # This section specifies the services that should be run. They are

        # grouped by type, and the order of services within each group

        # determines the order in which the services will be run.

        prep_services = weewx.engine.StdTimeSynch

        data_services = ,

        process_services = weewx.engine.StdConvert, weewx.engine.StdCalibrate, weewx.engine.StdQC, weewx.wxservices.StdWXCalculate

        archive_services = weewx.engine.StdArchive

        restful_services = weewx.restx.StdStationRegistry, weewx.restx.StdWunderground, weewx.restx.StdPWSweather, weewx.restx.StdCWOP, weewx.restx.StdWOW, weewx.restx.StdAWEKAS, user.owm.OpenWeatherMap

        report_services = weewx.engine.StdPrint, weewx.engine.StdReport

[gjr80]

You are using software record generation which causes windSpeed and windDir (and others) to be the weeWX calculated averages of the loop values in an archive period. On the other hand hardware record generation uses the archive record generated by your station. For Davis stations the windSpeed has a resolution of 1mph and the archive record wind directions are one of 16 discrete directions so hence you see wind speeds that at multiples of 1mph and discrete wind directions when you use hardware record generation.

To change back to hardware record generation, edit weewx.conf, under [StdArchive] set record_generation = hardware, save weewx.conf and restart WeeWX.

Gary

[Paolo Benvenuto]

Il giorno venerdì 28 settembre 2018 14:50:23 UTC+2, gjr80 ha scritto:

You are using software record generation which causes windSpeed and windDir (and others) to be the weeWX calculated averages of the loop values in an archive period. On the other hand hardware record generation uses the archive record generated by your station. For Davis stations the windSpeed has a resolution of 1mph and the archive record wind directions are one of 16 discrete directions so hence you see wind speeds that at multiples of 1mph and discrete wind directions when you use hardware record generation.

To change back to hardware record generation, edit weewx.conf, under [StdArchive] set record_generation = hardware, save weewx.conf and restart WeeWX.

let me try with

record_generation = hardware

but I still cannot understand why with this setting I'm going to get continous values

 

Gary

[Andrew Milner]

if record generation is hardware you will get 16 discrete wind direction values and windspeed to the nearest 1 mph (1.6 kph).

If record generation is software you will get a weewx average of the loop wind directions (sum of direction / number of readings) which could be any value, and will not be discrete to the nearest 1 mph and the direction will be sum of directions / number of readings in interval which will be a greater number of values.

[Paolo Benvenuto]

ok, now it's clera.

However, wind speed shows continous values, while gusts do not. Is there a reason for this behaviour?

don Paolo Benvenuto

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[gjr80]

windSpeed and windGust should both be using the same discrete 1mph (or equivalent km/h or m/s) values if you are using hardware record generation. Did you complete the last step in the instructions I gave you, you need to restart WeeWX for any changes in weewx.conf to take effect. When I look at your site just now you do indeed have continuous windSpeed values, but your site says WeeWX has been running for 2 days 6 hours, that indicates to me you have not restarted WeeWX.

Gary

[Thomas Keffer]

Gusts are a peak value. They are not an average. So, they retain the precision of the original measurement.

-tk

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