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2020 LTS Keflavik news post draft: Difference between revisions
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2020 LTS Keflavik news post draft (view source)
Revision as of 10:35, 6 November 2020
, 6 November 2020add to description of tides changes
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:[e.g. C172p, list craft with FG1000, new A320 as the glass cockpit airliner in FGAddon with the most detailed systems, Space Shuttle, is the compositor appropriate or is it too low profile right now?, carrier and supersonic jet improvements - Mention new or improved JSBSim aircraft with CFD or windtunnel data] | :[e.g. C172p, list craft with FG1000, new A320 as the glass cockpit airliner in FGAddon with the most detailed systems, Space Shuttle, is the compositor appropriate or is it too low profile right now?, carrier and supersonic jet improvements - Mention new or improved JSBSim aircraft with CFD or windtunnel data] | ||
Flightgear now simulates tides covering and uncovering shallow areas (littoral areas), like tidal flats (mudflats). You can see tides as the day progresses - | Flightgear now simulates tides covering and uncovering shallow areas (littoral areas), like tidal flats (mudflats). Tides are caused by the gravitational force from the moon and sun varying from one side of the Earth to another. | ||
[https://en.wikipedia.org/wiki/Tide#/media/File:Tide_overview.svg Small image of tides, just enough to make out the diagram. Source: wikipedia] The /difference/ in the pull of the moon or sun is effectively a force, the tidal force. Water is free to move, so it causes two bulges along the line between the center of the Earth and moon. | |||
When the centers of the moon and sun line up with the Earth during a 'full' or 'new' moon, then the tide effects add - and there are larger tidal forces causing 'spring tides'. The actual peak in tides can be delayed. [ [https://en.wikipedia.org/wiki/File:Tide_schematic.svg Small screenshot image, just enough to make out the diagram. Source: wikipedia] ] | |||
You can see tides as the day progresses - most often you'll see two highs and two lows per day. Change the date, and tide pattern will change. [The sun and moon position for calculating tides is from Flightgear's accurate celestial simulation (ephemeris) which gives the exact positions of planets and stars for the simulated time and date.] | |||
Tidal flats at low tide | Tidal flats at low tide | ||
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[http://wiki.flightgear.org/File:Tidal_flats_at_low_tide_in_Morecambe_Bay_in_England_(Flightgear_2020.x)_04.jpg Screenshot of Morecambe Bay at low tide] | [http://wiki.flightgear.org/File:Tidal_flats_at_low_tide_in_Morecambe_Bay_in_England_(Flightgear_2020.x)_04.jpg Screenshot of Morecambe Bay at low tide] | ||
Water covers the tidal flats at high tide - only the environmental clock is changed. The clouds are the same as the weather simulation is run by the physics clock - you can see how the light is scattered by various types of clouds and hazes depending on sun angle. | Water covers the tidal flats at high tide - only the environmental clock is changed. The clouds are the same, as the weather simulation is run by the physics clock - you can see how the light is scattered by various types of clouds and hazes depending on sun angle. | ||
[http://wiki.flightgear.org/File:Tidal_flats_at_high_tide_in_Morecambe_Bay_in_England_(Flightgear_2020.x)_05.jpg Screenshot of Morecambe Bay at high tide] | [http://wiki.flightgear.org/File:Tidal_flats_at_high_tide_in_Morecambe_Bay_in_England_(Flightgear_2020.x)_05.jpg Screenshot of Morecambe Bay at high tide] | ||