package meta import ( "regexp" "strconv" "github.com/dsoprea/go-exif/v2" ) // var GpsCoordsRegexp = regexp.MustCompile("(-?\\d+(\\.\\d+)?),\\s*(-?\\d+(\\.\\d+)?)") var GpsCoordsRegexp = regexp.MustCompile("[0-9\\.]+") var GpsRefRegexp = regexp.MustCompile("[NSEW]+") // GpsToLatLng returns the GPS latitude and longitude as float point number. func GpsToLatLng(s string) (lat, lng float32) { if s == "" { return 0, 0 } co := GpsCoordsRegexp.FindAllString(s, -1) re := GpsRefRegexp.FindAllString(s, -1) if len(co) != 6 || len(re) != 2 { return 0, 0 } latDeg := exif.GpsDegrees{ Orientation: re[0][0], Degrees: GpsCoord(co[0]), Minutes: GpsCoord(co[1]), Seconds: GpsCoord(co[2]), } lngDeg := exif.GpsDegrees{ Orientation: re[1][0], Degrees: GpsCoord(co[3]), Minutes: GpsCoord(co[4]), Seconds: GpsCoord(co[5]), } return float32(latDeg.Decimal()), float32(lngDeg.Decimal()) } // GpsToDecimal returns the GPS latitude or longitude as decimal float point number. func GpsToDecimal(s string) float32 { if s == "" { return 0 } co := GpsCoordsRegexp.FindAllString(s, -1) re := GpsRefRegexp.FindAllString(s, -1) if len(co) != 3 || len(re) != 1 { return 0 } latDeg := exif.GpsDegrees{ Orientation: re[0][0], Degrees: GpsCoord(co[0]), Minutes: GpsCoord(co[1]), Seconds: GpsCoord(co[2]), } return float32(latDeg.Decimal()) } // GpsToLng returns a single GPS coordinate value as float point number (degree, minute or second). func GpsCoord(s string) float64 { if s == "" { return 0 } result, err := strconv.ParseFloat(s, 64) if err != nil { log.Debugf("metadata: %s", err) } return result }