Ambient Weather WS-091-C Guia do Utilizador descarregar pdf (Página 15)

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Virtual Weather Station User's Guide

-15- 03/07/06

^wsdescription^

For more information regarding tags, please reference

Section 8.13.1.

6.7.2 Station Location

Used for automated webpage insertion, the station location

can be inserted into any webpage using the following tag:

^wslocation^

For more information regarding tags, please reference

Section 8.13.1.

6.7.3 World Location

Used for automated webpage insertion, the world location

can be inserted into any webpage using the following tag:

^world_id^

For more information regarding tags, please reference

Section 8.13.1.

6.7.4 Longitude and Latitude

To calculate the sunrise, sunset, moonrise and moonset for

your location, the longitude, latitude, and time zone is

required. If the sunrise and sunset appear incorrect, see

Troubleshooting Tips.

There are several sources for determining the longitude and

latitude for your location. The best source is the Internet.

Another source may be your local town hall.

GeoCode.com provides this information at the following

link:

http://www.geocode.com/modules.php?name=TestDrive_E

agle

or browse to www.GeoCode.com and select the link “Test

Drive”.

Note – if you live in the Southern Hemisphere, enter a

negative sign in front of the latitude. If you live in the

Western Hemisphere (America, etc), enter a negative sign

in front of the longitude.

Example for Seattle, WA:

Longitude = -112.3168

Latitude = 47.0652

6.7.5 Time Zone

The time zone is required for calculating the sunrise,

sunset, moonrise and moonset. If you live in a time zone

that does not adhere to the GMT standard and is offset by

30 minutes, enter the offset in the +Time Zone Offset (min)

numerical field.

If the daylight savings time is not calculated properly by

your Windows operating system, you can compensate by

adding or subtracting 60 minutes.

The celestial calculator is a close approximation of the

sunrise and sunset in your location and may be inaccurate

by several minutes due to equation inaccuracy or your

altitude (the equations are based on sea-level).

6.7.6 Altitude

An air data calculator is included in Virtual Weather

Station. Virtual Weather Station uses the same formulas

used in airplane data computers flying throughout the

world. The altitude and air data information provides air

density, pressure altitude, corrected temperature and

pressure to sea-level conditions.

6.7.7 Air Data Calculator (correcting Pressure

to Sea-level Conditions)

To compare pressure conditions from one location to

another, meteorologists correct pressure to sea-level

conditions. Because the air pressure decreases as you rise in

altitude, the sea-level corrected pressure (the pressure your

location would be at if located at sea-level) is generally

higher than your measured pressure. Thus, your pressure

may read 28.62 inHg (969 mb) at an altitude of 1000 feet

(305 m), but the corrected pressure is 30.00 inHg (1016

mb).

The standard sea-level pressure is 29.92 in Hg (1013 mb).

Pressure conditions greater than 29.92 inHg (1013 mb) are

considered high pressure and less than are considered low

pressure.

Most weather stations instruct you to find a reporting

station near your location to identify the corrected pressure,

but Virtual Weather Station calculates this offset for you.

To calculate this offset:

ü Enter your altitude

ü Virtual Weather Station displays your bias with

respect to sea-level.

ü Enter this bias in your weather station (see the

weather station instruction manual for details).

Sea-level temperature is important to racing enthusiasts and

engineers for calculating performance characteristics.

6.7.8 Station Settings, Sun, Moon and Altitude

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