57 lines
1.2 KiB
Go
57 lines
1.2 KiB
Go
package exif
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import (
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"errors"
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"fmt"
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"time"
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"github.com/golang/geo/s2"
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)
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var (
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ErrGpsCoordinatesNotValid = errors.New("GPS coordinates not valid")
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)
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type GpsDegrees struct {
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Orientation byte
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Degrees, Minutes, Seconds float64
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}
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func (d GpsDegrees) String() string {
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return fmt.Sprintf("Degrees<O=[%s] D=(%g) M=(%g) S=(%g)>", string([]byte{d.Orientation}), d.Degrees, d.Minutes, d.Seconds)
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}
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func (d GpsDegrees) Decimal() float64 {
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decimal := float64(d.Degrees) + float64(d.Minutes)/60.0 + float64(d.Seconds)/3600.0
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if d.Orientation == 'S' || d.Orientation == 'W' {
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return -decimal
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} else {
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return decimal
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}
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}
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type GpsInfo struct {
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Latitude, Longitude GpsDegrees
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Altitude int
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Timestamp time.Time
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}
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func (gi *GpsInfo) String() string {
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return fmt.Sprintf("GpsInfo<LAT=(%.05f) LON=(%.05f) ALT=(%d) TIME=[%s]>", gi.Latitude.Decimal(), gi.Longitude.Decimal(), gi.Altitude, gi.Timestamp)
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}
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func (gi *GpsInfo) S2CellId() s2.CellID {
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latitude := gi.Latitude.Decimal()
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longitude := gi.Longitude.Decimal()
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ll := s2.LatLngFromDegrees(latitude, longitude)
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cellId := s2.CellIDFromLatLng(ll)
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if cellId.IsValid() == false {
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panic(ErrGpsCoordinatesNotValid)
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}
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return cellId
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}
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