Opanda.com -> PowerExif Editor -> User's Guide -> GPS
Attribute Information
The attribute information (field names and codes) recorded in the GPS Info IFD is given in Table 12, followed by an explanation of the contents.
Table 12 GPS Attribute Information
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Tag Name | Field Name | Tag ID | Type | Count | |
| Dec | Hex | |||||
|
A. |
Tags Relating to GPS | |||||
| GPS tag version | GPSVersionID | 0 | 0 | BYTE | 4 | |
| North or South Latitude | GPSLatitudeRef | 1 | 1 | ASCII | 2 | |
| Latitude | GPSLatitude | 2 | 2 | RATIONAL | 3 | |
| East or West Longitude | GPSLongitudeRef | 3 | 3 | ASCII | 2 | |
| Longitude | GPSLongitude | 4 | 4 | RATIONAL | 3 | |
| Altitude reference | GPSAltitudeRef | 5 | 5 | BYTE | 1 | |
| Altitude | GPSAltitude | 6 | 6 | RATIONAL | 1 | |
| GPS time (atomic clock) | GPSTimeStamp | 7 | 7 | RATIONAL | 3 | |
| GPS satellites used for measurement | GPSSatellites | 8 | 8 | ASCII | Any | |
| GPS receiver status | GPSStatus | 9 | 9 | ASCII | 2 | |
| GPS measurement mode | GPSMeasureMode | 10 | A | ASCII | 2 | |
| Measurement precision | GPSDOP | 11 | B | RATIONAL | 1 | |
| Speed unit | GPSSpeedRef | 12 | C | ASCII | 2 | |
| Speed of GPS receiver | GPSSpeed | 13 | D | RATIONAL | 1 | |
| Reference for direction of movement | GPSTrackRef | 14 | E | ASCII | 2 | |
| Direction of movement | GPSTrack | 15 | F | RATIONAL | 1 | |
| Reference for direction of image | GPSImgDirectionRef | 16 | 10 | ASCII | 2 | |
| Direction of image | GPSImgDirection | 17 | 11 | RATIONAL | 1 | |
| Geodetic survey data used | GPSMapDatum | 18 | 12 | ASCII | Any | |
| Reference for latitude of destination | GPSDestLatitudeRef | 19 | 13 | ASCII | 2 | |
| Latitude of destination | GPSDestLatitude | 20 | 14 | RATIONAL | 3 | |
| Reference for longitude of destination | GPSDestLongitudeRef | 21 | 15 | ASCII | 2 | |
| Longitude of destination | GPSDestLongitude | 22 | 16 | RATIONAL | 3 | |
| Reference for bearing of destination | GPSDestBearingRef | 23 | 17 | ASCII | 2 | |
| Bearing of destination | GPSDestBearing | 24 | 18 | RATIONAL | 1 | |
| Reference for distance to destination | GPSDestDistanceRef | 25 | 19 | ASCII | 2 | |
| Distance to destination | GPSDestDistance | 26 | 1A | RATIONAL | 1 | |
A. Tags Relating to GPS
Indicates the version of GPSInfoIFD. The version is given as 2.0.0.0. This tag is mandatory when GPSInfo tag is present. (Note: The GPSVersionID tag is given in bytes, unlike the ExifVersion tag. When the version is 2.0.0.0, the tag value is 02000000.H.)
Tag = 0 (0.H)
Type = BYTE
Count = 4
Default = 2.0.0.0
2.0.0.0 = Version 2.0
Other = reserved
Indicates whether the latitude is north or south latitude. The ASCII value 'N' indicates north latitude, and 'S' is south latitude.
Tag = 1 (1.H)
Type = ASCII
Count = 2
Default = none
'N' = North latitude
'S' = South latitude
Other = reserved
Indicates the latitude. The latitude is expressed as three RATIONAL values giving the degrees, minutes, and seconds, respectively. When degrees, minutes and seconds are expressed, the format is dd/1,mm/1,ss/1. When degrees and minutes are used and, for example, fractions of minutes are given up to two decimal places, the format is dd/1,mmmm/100,0/1.
Tag = 2 (2.H)
Type = RATIONAL
Count = 3
Default = none
Indicates whether the longitude is east or west longitude. ASCII 'E' indicates east longitude, and 'W' is west longitude.
Tag = 3 (3.H)
Type = ASCII
Count = 2
Default = none
'E' = East longitude
'W' = West longitude
Other = reserved
Indicates the longitude. The longitude is expressed as three RATIONAL values giving the degrees, minutes, and seconds, respectively. When degrees, minutes and seconds are expressed, the format is ddd/1,mm/1,ss/1. When degrees and minutes are used and, for example, fractions of minutes are given up to two decimal places, the format is ddd/1,mmmm/100,0/1.
Tag = 4 (4.H)
Type = RATIONAL
Count = 3
Default = none
Indicates the altitude used as the reference altitude. In this version the reference altitude is sea level, so this tag must be set to 0. The reference unit is meters. Note that this tag is BYTE type, unlike other reference tags.
Tag = 5 (5.H)
Type = BYTE
Count = 1
Default = 0
0 = Sea level
Other = reserved
Indicates the altitude based on the reference in GPSAltitudeRef . Altitude is expressed as one RATIONAL value. The reference unit is meters.
Tag = 6 (6.H)
Type = RATIONAL
Count = 1
Default = none
Indicates the time as UTC (Coordinated Universal Time). TimeStamp is expressed as three RATIONAL values giving the hour, minute, and second.
Tag = 7 (7.H)
Type = RATIONAL
Count = 3
Default = none
Indicates the GPS satellites used for measurements. This tag can be used to describe the number of satellites, their ID number, angle of elevation, azimuth, SNR and other information in ASCII notation. The format is not specified. If the GPS receiver is incapable of taking measurements, value of the tag must be set to NULL.
Tag = 8 (8.H)
Type = ASCII
Count = Any
Default = none
Indicates the status of the GPS receiver when the image is recorded. 'A' means measurement is in progress, and 'V' means the measurement is Interoperability.
Tag = 9 (9.H)
Type = ASCII
Count = 2
Default = none
'A' = Measurement in progress
'V' = Measurement Interoperability
Other = reserved
Indicates the GPS measurement mode. '2' means two-dimensional measurement and '3' means three-dimensional measurement is in progress.
Tag = 10 (A.H)
Type = ASCII
Count = 2
Default = none
'2' = 2-dimensional measurement
'3' = 3-dimensional measurement
Other = reserved
Indicates the GPS DOP (data degree of precision). An HDOP value is written during two-dimensional measurement, and PDOP during three- dimensional measurement.
Tag = 11 (B.H)
Type = RATIONAL
Count = 1
Default = none
Indicates the unit used to express the GPS receiver speed of movement. 'K' 'M' and 'N' represents kilometers per hour, miles per hour, and knots.
Tag = 12 (C.H)
Type = ASCII
Count = 2
Default = 'K'
'K' = Kilometers per hour
'M' = Miles per hour
'N' = Knots
Other = reserved
Indicates the speed of GPS receiver movement.
Tag = 13 (D.H)
Type = RATIONAL
Count = 1
Default = none
Indicates the reference for giving the direction of GPS receiver movement. 'T' denotes true direction and 'M' is magnetic direction.
Tag = 14 (E.H)
Type = ASCII
Count = 2
Default = 'T'
'T' = True direction
'M' = Magnetic direction
Other = reserved
Indicates the direction of GPS receiver movement. The range of values is from 0.00 to 359.99.
Tag = 15 (F.H)
Type = RATIONAL
Count = 1
Default = none
Indicates the reference for giving the direction of the image when it is captured. 'T' denotes true direction and 'M'
is
magnetic direction.
Tag = 16 (10.H)
Type = ASCII
Count = 2
Default = 'T'
'T' = True direction
'M' = Magnetic direction
Other = reserved
Indicates the direction of the image when it was captured. The range of values is from 0.00 to 359.99.
Tag = 17 (11.H)
Type = RATIONAL
Count = 1
Default = none
Indicates the geodetic survey data used by the GPS receiver. If the survey data is restricted to Japan, the value of this tag is 'TOKYO' or 'WGS-84'. If a GPS Info tag is recorded, it is strongly recommended that this tag be recorded.
Tag = 18 (12.H)
Type = ASCII
Count = Any
Default = none
Indicates whether the latitude of the destination point is north or south latitude. The ASCII value 'N' indicates north latitude, and 'S' is south latitude.
Tag = 19 (13.H)
Type = ASCII
Count = 2
Default = none
'N' = North latitude
'S' = Sourth latitude
Other = reserved
Indicates the latitude of the destination point. The latitude is expressed as three RATIONAL values giving the degrees, minutes, and seconds, respectively. When degrees, minutes and seconds are expressed, the format is dd/1,mm/1,ss/1. When degrees and minutes are used and, for example, fractions of minutes are given up to two decimal places, the format is dd/1,mmmm/100,0/1.
Tag = 20 (14.H)
Type = RATIONAL
Count = 3
Default = none
Indicates whether the longitude of the destination point is east or west longitude. ASCII 'E' indicates east longitude, and 'W' is west longitude.
Tag = 21 (15.H)
Type = ASCII
Count = 2
Default = none
'E' = East longitude
'W' = West longitude
Other = reserved
Indicates the longitude of the destination point. The longitude is expressed as three RATIONAL values giving the degrees, minutes, and seconds, respectively. When degrees, minutes and seconds are expressed, the format is ddd/1,mm/1,ss/1. When degrees and minutes are used and, for example, fractions of minutes are given up to two decimal places, the format is ddd/1,mmmm/100,0/1.
Tag = 22 (16.H)
Type = RATIONAL
Count = 3
Default = none
Indicates the reference used for giving the bearing to the destination point. 'T' denotes true direction and 'M' is magnetic direction.
Tag = 23 (17.H)
Type = ASCII
Count = 2
Default = 'T'
'T' = True direction
'M' = Magnetic direction
Other = reserved
Indicates the bearing to the destination point. The range of values is from 0.00 to 359.99.
Tag = 24 (18.H)
Type = RATIONAL
Count = 1
Default = none
Indicates the unit used to express the distance to the destination point. 'K', 'M' and 'N' represent kilometers, miles and knots.
Tag = 25 (19.H)
Type = ASCII
Count = 2
Default = 'K'
'K' = Kilometers
'M' = Miles
'N' = Knots
Other = reserved
Indicates the distance to the destination point.
Tag = 26 (1A.H)
Type = RATIONAL
Count = 1
Default = none
Note: When the tag Type is ASCII, it must be terminated with NULL.
It must be noted carefully that since the value count includes the terminator NULL, the total count is the number of
data+1. For example, GPSLatitudeRef cannot have any values other than Type ASCII 'N' or 'S'; but because the terminator
NULL is added, the value of N is 2.
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