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'''NOTE: This feature is only available in version 1.8.8 build 871 and greater''' Atmospheric pressure (also known as barometric pressure) is the pressure exerted by the weight of the air above the Earth's surface. It is measured using a [http://en.wikipedia.org/wiki/Barometer barometer]. Atmospheric pressure and its rate of change are important parameters for weather and the ocean. ~~==Units==~~ ~~The units used for pressure are hPa (hecto Pascals) or the equivalent mb (millibars), but in the US inHg (inches of mercury) are still used by some.~~ The file strings.ini allows the customisation of a number of phrases, including the associated webtags. ~~==Datum==~~ ~~Pressure decreases exponentially with altitude, so for consistency it is reduced to the common datum of mean sea level (MSL).~~ Currently you can modified phrases associated with the following: ~~==Setting the Datum==~~ ~~In Cumulus, the pressure datum is set by going to Configuration/Calibration and entering a number into the Pressure slot in Offsets.~~ Forecasting The best way to get MSL pressure at your location is to go to a site like [http://www.wunderground.com/ Weather Underground] and enter your location. It will find a weather station nearby and give you the current MSL pressure. It's a good idea to choose an airport site because you can be sure that it has been accurately reduced to MSL pressure. Moonphases *Beaufort Scale (from build 874 onwards) ~~On the other hand, most airport sites only give pressure to the nearest hPa, so you can be 0.5 hPa out if you use that, whereas most personal weather stations give pressure with 0.1 hPa precision.~~ =Modifying the phrases= ~~The best time to set your datum is when the pressure is steady; in other words when Trend shown at the bottom left in the Cumulus display is zero hPa/h.~~ In the folder where you installed Cumulus, you will find a file called <tt>samplestrings.ini</tt>. Take a copy of this, leave it in the Cumulus installation folder, and name it <tt>strings.ini</tt> ~~==Locating the Barometer==~~ For most personal weather stations, the barometer is in the console, usually attached to the printed circuit board. These barometers are very cheap devices that simply record the load on a diaphragm. Unlike the barometer in an automatic weather station, they have no temperature compensation. Therefore, for best pressure readings, you should locate the console in a place where the temperature is reasonably constant, not in direct sunlight or near a heater. '''You must restart Cumulus if you make changes to the Strings.ini file while Cumulus is running''' ~~==How Accurate are PWS Barometers?==~~ ~~The figure below shows a comparison between the pressure measured by a Fine Offset PWS and a nearby AWS. You can see that the comparison is excellent.~~ ~~[[file:KyleVsBrockworthPress1.png]]~~ ~~[[Category:Terminology]]~~ =Forecast phrases= By default Cumulus will provide a list of 28 possible forecasts. By editing the strings.ini file you can change the wording of these or translate to another language. You must have opted to have the forecast generated by Cumulus in the configuration page. The file contains all the strings used for the forecasts, example: forecast23=Precipitation at frequent intervals you could change to forecast23=Rain again =Moon Phases= The option to change moon phases requires version 1.8.8 build 872 or greater, currently in beta testing Withing the [MoonPhases] section of the strings.ini file there are 8 possible phrases to describe the phases of the moon. Adjust these as required. =Example file= [Forecast] Forecast=Forecast notavailable=Not available exceptional=Exceptional Weather forecast1=Settled fine forecast2=Fine weather forecast3=Becoming fine forecast4=Fine, becoming less settled forecast5=Fine, possible showers forecast6=Fairly fine, improving forecast7=Fairly fine, possible showers early forecast8=Fairly fine, showery later forecast9=Showery early, improving forecast10=Changeable, mending forecast11=Fairly fine, showers likely forecast12=Rather unsettled clearing later forecast13=Unsettled, probably improving forecast14=Showery, bright intervals forecast15=Showery, becoming less settled forecast16=Changeable, some precipitation forecast17=Unsettled, short fine intervals forecast18=Unsettled, precipitation later forecast19=Unsettled, some precipitation forecast20=Mostly very unsettled forecast21=Occasional precipitation, worsening forecast22=Precipitation at times, very unsettled forecast23=Precipitation at frequent intervals forecast24=Precipitation, very unsettled forecast25=Stormy, may improve forecast26=Stormy, much precipitation [MoonPhases] Newmoon=New moon WaxingCrescent=Waxing Crescent FirstQuarter=First Quarter WaxingGibbous=Waxing Gibbous Fullmoon=Full moon WaningGibbous=Waning Gibbous LastQuarter=Last Quarter WaningCrescent=Waning Crescent [Beaufort] Calm=Calm Lightair=Light air Lightbreeze=Light breeze Gentlebreeze=Gentle breeze Moderatebreeze=Moderate breeze Freshbreeze=Fresh breeze Strongbreeze=Strong breeze Neargale=Near gale Gale=Gale Stronggale=Strong gale Storm=Storm Violentstorm=Violent storm Hurricane=Hurricane [Trends] Risingveryrapidly=Rising very rapidly Risingquickly=Rising quickly Rising=Rising Risingslowly=Rising slowly Steady=Steady Fallingslowly=Falling slowly Falling=Falling Fallingquickly=Falling quickly Fallingveryrapidly=Falling very rapidly [Compass] N=N NNE=NNE NE=NE ENE=ENE E=E ESE=ESE SE=SE SSE=SSE S=S SSW=SSW SW=SW WSW=WSW W=W WNW=WNW NW=NW NNW=NNW A variety of translated files are coming soon in the other [[Languages]] section [[Category: Configuration Files]]

Pressure Measurement and Strings.ini: Difference between pages

Strings.ini (view source)

Revision as of 10:19, 13 May 2011

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