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Added possibility to compute the UTM zone from lat/lon reference points

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Martin Tůma 2017-04-01 16:25:33 +02:00
parent e87fff4bf8
commit 60f107d7cd
1 changed files with 22 additions and 0 deletions
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src/utm.cpp Normal file
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#include "utm.h"
UTM::UTM(const Coordinates &c)
{
int zone = int((c.lon() + 180)/6) + 1;
if (c.lat() >= 56.0 && c.lat() < 64.0 && c.lon() >= 3.0 && c.lon() < 12.0)
zone = 32;
if (c.lat() >= 72.0 && c.lat() < 84.0) {
if (c.lon() >= 0.0 && c.lon() < 9.0)
zone = 31;
else if (c.lon() >= 9.0 && c.lon() < 21.0)
zone = 33;
else if (c.lon() >= 21.0 && c.lon() < 33.0)
zone = 35;
else if (c.lon() >= 33.0 && c.lon() < 42.0)
zone = 37;
}
double cm = (zone - 1)*6 - 180 + 3;
_tm = TransverseMercator(cm, 0.9996, 500000, (c.lat() < 0) ? 10000000 : 0);
}