80 lines
1.7 KiB
Go
80 lines
1.7 KiB
Go
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
|
|
}
|