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Increase precision of GpsDegrees.Raw() #87

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Increase precision of GpsDegrees.Raw() #87

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9 changes: 5 additions & 4 deletions v3/gps.go
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Original file line number Diff line number Diff line change
Expand Up @@ -77,14 +77,15 @@ func (d GpsDegrees) Decimal() float64 {
return decimal
}

// Raw returns a Rational struct that can be used to *write* coordinates. In
// practice, the denominator are typically (1) in the original EXIF data, and,
// that being the case, this will best preserve precision.
// Raw returns a slice of Rationals that can be used to *write* coordinates. The
// conversion uses a denominator of 1 for degrees and minutes and 1000 for
// seconds. These denominators are not necessarily the same as the original
// data, but they will provide a precision of about an inch at the equator.
func (d GpsDegrees) Raw() []exifcommon.Rational {
return []exifcommon.Rational{
{Numerator: uint32(d.Degrees), Denominator: 1},
{Numerator: uint32(d.Minutes), Denominator: 1},
{Numerator: uint32(d.Seconds), Denominator: 1},
{Numerator: uint32(d.Seconds * 1000.0), Denominator: 1000},
}
}

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