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annotate ZoneDetect.md @ 2890:627bd720b0a1

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Merge merge requests 660, 658, 655 and 648 * github/merge-requests/660: tr.po-update * github/merge-requests/658: Bug fix: reads of uninitialized data * github/merge-requests/655: fix build against exiv2-0.27.x * github/merge-requests/648: Correctly size image windows opened from collections
author Klaus Ethgen <Klaus@Ethgen.de>
date Tue, 05 Feb 2019 21:06:16 +0100
parents 8bab8ac8ade0
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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.