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annotate ZoneDetect.md @ 2876:9408af32ed62

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Fix #650, 651: fullscreen does not work over multiple monitors https://github.com/BestImageViewer/geeqie/issues/650
author Jiří Boháč <>
date Wed, 19 Dec 2018 10:10:10 +0000
parents 8bab8ac8ade0
children
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8bab8ac8ade0 Local time - UTC offset and daylight saving correction
Colin Clark <colin.clark@cclark.uk>
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1 The detection of timezone is performed by
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2 [ZoneDetect](https://github.com/BertoldVdb/ZoneDetect)
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8bab8ac8ade0 Local time - UTC offset and daylight saving correction
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4 timezone16.bin has a longitude resolution of 0.0055 degrees (~0.5km).
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5 timezone21.bin has a longitude resolution of 0.00017 degrees (~20m).
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7 The safe zone result indicates how close you are to the nearest border (flat earth model using lat and lon as x and y), so you can know when to do a new lookup. If you don't need it you can ignore it, in this case you can pass a NULL parameter to save the (very small) calculation effort.
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8bab8ac8ade0 Local time - UTC offset and daylight saving correction
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10 Note that the [underlying database](https://github.com/evansiroky/timezone-boundary-builder) will change from time-to-time.