Improve accuracy of to_latlon()
#49
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`c` should be calculated using `E_P2` rather `_E`, refer to USGS 1395
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@@ Coverage Diff @@
## master #49 +/- ##
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Coverage 95.09% 95.09%
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Files 3 3
Lines 163 163
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Hits 155 155
Misses 8 8
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Turbo87
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to_latlon()
chris-cooper
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Feb 9, 2021
The current implemenation has inaccuracies. See: - Turbo87/utm#36 - Turbo87/utm#49 repro: ``` var utm = require("utm"); var originalLatitude = -33.8688 var originalLongitude = 151.2093 const { easting, northing, zoneNum, zoneLetter} = utm.fromLatLon(originalLatitude,originalLongitude); const { latitude, longitude } = utm.toLatLon(easting, northing, zoneNum, zoneLetter); console.log(latitude, longitude) console.log(`lat/lon delta: ${latitude-originalLatitude}:${longitude-originalLongitude}`) { const { easting: easting2, northing: northing2, zoneNum: zoneNum2, zoneLetter: zoneLetter2} = utm.fromLatLon(latitude,longitude); console.log(`delta: ${easting - easting2}:${northing-northing2}`); } ```
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cshould be calculated usingE_P2rather_E, refer to USGS 1395This bug will reduce the accuracy in some cases when converting from UTM X/Y to Lat/Lon, as has been discussed in #36 .