Specifications of xmp.camera tags - PIX4Dmapper

Key

Value example

Type

Meaning

Xmp.Camera.ModelType

"fisheye"

XmpText

Camera model type: one of "perspective" or "fisheye".

Xmp.Camera.PrincipalPoint

2.42299,1.850154

XmpText

c _x, c _y in millimetres separated by comma.

Xmp.Camera.PerspectiveFocalLength

4.569165

XmpText

For perspective camera: focal length in millimetres.

Xmp.Camera.PerspectiveDistortion

0.201690322,-0.358534038,

0.256185599,

0.004208643,0.000268361

XmpText

For perspective camera: R1, R2, R3, T1, T2 separated by comma: How are the Internal and External Camera Parameters defined?.

Xmp.Camera.FisheyeAffineMatrix

1583.319083002,0,0,

1583.319083002

Ascii

For fisheye camera: Affine matrix C, D, E, F separated by comma: How are the Internal and External Camera Parameters defined?.

Xmp.Camera.FisheyeAffineSymmetric

1

Boolean

For fisheye camera: If symmetric affine matrix should be used (default false).

Xmp.Camera.FisheyePolynomial

0,1,-0.025178575,

0.167834214

Ascii

For fisheye camera: Polynomial separated by comma: How are the Internal and External Camera Parameters defined?.

Xmp.Camera.RigName

Airinov multiSPEC4C 1.1

XmpText

Name of the rig model this image belongs to.

Xmp.Camera.RigCameraIndex

0

Short

Corresponding camera index within the rig model.

Xmp.Camera.RigRelatives

0.3836, -1.27665, -0.1156

XmpText

Rotation angles with respect to the reference camera. For angle convention in Pix4D: Yaw, Pitch, Roll and Omega, Phi, Kappa angles .

Xmp.Camera.CaptureUUID

B9A2F3676304A83F92261B5245124F28

XmpText

Unique identifier for one capture within a flight. This allows to find that capture across different rig cameras.

Xmp.Camera.FlightUUID

7F8DC95FFCADA339805BD53338EC888 E

XmpText

Unique identifier for one flight

Xmp.Camera.UID

12606478859240980328

XmpString

Globally unique image identifier. Unsigned integer, must be a random number uniformly distributed in the range [0, 2⁶⁴-1]. The same random sequence must not be repeated in different units or for different acquisitions.

Key

Value example

Type

Meaning

Xmp.Camera.BandName

{"Red", "NIR"}

XmpSeq

Name of each band (sequence).

Single page image: one name for each band of the image.
Multipage image: one band name per image page. (Note: this allows only one band per page since the sequence of the sequence is not possible).

The band name must not start with the following characters: 0-9, ',', '(' or ')'.

Xmp.Camera.CentralWavelength

{660, 800}

XmpSeq

Central wavelength of each band in nm. Similar to band names. If band names are not defined, default band names are generated.

Xmp.Camera.WavelengthFWHM

{10, 10}

XmpSeq

Full-width half maximum of the wavelength distribution in nm.

Xmp.Camera.BlackCurrent

{10, 7}

XmpSeq

Dark current for each band/page: Camera radiometric correction specifications.

Xmp.Camera.BandSensitivity

{0.78, 0.043}

XmpSeq

The sensitivity of each band (pixel intensity value per irradiance).

Xmp.Camera.SunSensor

{12.87, 9.72}

XmpSeq

Sun irradiance sensor (upwards looking sensor) raw value for each band.

Xmp.Camera.SunSensorExposureTime

0.1

XmpText

Sun irradiance sensor exposure time in seconds.

Xmp.Camera.SunSensorSensitivity

{16.45, 14.08}

XmpSeq

Sun irradiance sensor sensitivity.

Xmp.Camera.InvalidPixel

{"40,593,981,291"}

XmpSeq

List of bad pixels as comma-separated x,y coordinate list, one sequence for each band.

Xmp.Camera.VignettingPolynomial

{"0.00325, 1.983e-6, 5.0983e-9"}

XmpSeq

Vignetting correction by radial polynomial: 1D polynomial coefficients (one string of comma-separated values per page, 1 string for RGB images): Camera radiometric correction specifications.

Xmp.Camera.VignettingCenter

{"542,912"}

XmpSeq

Vignetting correction by radial polynomial: Center point cx, cy in pixel (one string of comma-separated values per page): Camera radiometric correction specifications.

Xmp.Camera.VignettingPolynomial2DName

{"0,0,1,0, ..., 2,2,3,1"}

XmpSeq

Vignetting correction by 2D polynomial: name of coefficients: n,m for c_{n,m} separated by commas (one string of comma-separated values per page): Camera radiometric correction specifications.

Xmp.Camera.VignettingPolynomial2D

{"0.633287676149, 1.47936368033, ..., -1.58329242609, 0.130259802058"}

XmpSeq

Vignetting correction by 2D polynomial: coefficients c_{n,m} for names given by Xmp.Camera.VignettingPolynomial2DName separated by commas (one string of comma-separated values per page): Camera radiometric correction specifications.

Xmp.Camera.ColorTransform

{1, -0.114886,-0.0456918,

-0.176716, 1, 0,

-0.0715561, 0, 1}

XmpSeq

Sequence of double, color conversion matrix (for RGB: R2R, G2R, B2R, R2G, G2G, B2G, R2B, G2B, B2B). Considering the information as a 3x3 matrix M, (R,G,B) _new= M * (R,G,B).

Xmp.Camera.IsNormalized

1

Boolean

Defines whether the radiometric correction is required (value 0) or the data has already been corrected (value 1) and therefore should not be corrected.

Key

Value example

Type

Meaning

Xmp.Camera.Albedo

{0.22, 0.19 , 0.37}

XmpSeq

For radiometric calibration target images: Albedo of the disk for each band/page.

Xmp.Camera.ReflectArea

{"X1,Y1,X2,Y2,X3,Y3,X4,Y4", "X1,Y1,...", ...}

XmpSeq

For radiometric calibration target images: polygon defining the target area for each page.

Xmp.Camera.CalibrationPicture

2

Short

Specifies if this image is a radiometric calibration target: 0 = no, 1 = yes but invalid, 2 = yes and valid.

For Sequoia cameras: 0 = no, 1 and 2 = yes.

Key

Value example(s)

Type

Meaning

Xmp.Camera.Yaw

72.7942

Rational or Double

Orientation data in degrees. For more information on the definition of yaw, pitch, roll: Yaw, Pitch, Roll and Omega, Phi, Kappa angles.

Xmp.Camera.Pitch

1.7943

Rational or Double

Orientation data in degrees. For more information on the definition of yaw, pitch, roll: Yaw, Pitch, Roll and Omega, Phi, Kappa angles.

Xmp.Camera.Roll

2.8909

Rational or Double

Orientation data in degrees. For more information on the definition of yaw, pitch, roll: Yaw, Pitch, Roll and Omega, Phi, Kappa angles.

Xmp.Camera.HorizCS

EPSG:4326

EPSG:6318

XmpString

The horizontal coordinate system used by the GPS receiver, i.e. by Exif.GPSInfo.GPSLatitude and Exif.GPSInfo.GPSLongitude, in the form auth:WKID, where auth is an authority (e.g. EPSG or ESRI) and WKID a well-known code.

Xmp.Camera.VertCS

EPSG:5773

EPSG:5703

XmpString

The vertical coordinate system used by the GPS receiver, i.e. by Exif.GPSInfo.GPSAltitude, in the form auth:WKID, where auth is an authority (e.g. EPSG or ESRI) and WKID a well-known code, or the special value ellipsoidal for ellipsoidal height.

Xmp.Camera.GPSXYAccuracy

5

Rational

Horizontal GPS Accuracy in meters.

Xmp.Camera.GPSZAccuracy

10

Rational

Vertical GPS Accuracy in meters.

Xmp.Camera.GyroRate

0.0487

Rational

Gyro rate during image acquisition, lower = better quality.

Xmp.Camera.IMUPitchAccuracy

0.113

Rational

The value in degrees of 1-sigma of the Gaussian noise of the IMU Pitch measurement.

Xmp.Camera.IMURollAccuracy

0.087

Rational

The value in degrees of 1-sigma of the Gaussian noise of the IMU Roll measurement.

Xmp.Camera.IMUYawAccuracy

1.250

Rational

The value in degrees of 1-sigma of the Gaussian noise of the IMU Yaw measurement.

Xmp.Camera.NominalCameraDistance

25.87

Rational

Nominal GPS distance between calibrated cameras in meters in order to have a decent overlap. Use to dynamically remove the cameras with worst quality as determined by the GyroRate such the target distance is as specified.

Xmp.Camera.AboveGroundAltitude

25.3

Rational or Double

Altitude above ground/take-off location in meters (from the altimeter of the drone).

Key

Value example

Type

Meaning

Xmp.Camera.SunSensorYaw

72.7942

Rational or Double

Sun irradiance sensor orientation data in degrees. For more information on the definition of yaw, pitch, roll: Yaw, Pitch, Roll and Omega, Phi, Kappa angles.

Xmp.Camera.SunSensorPitch

1.7943

Rational or Double

Sun irradiance sensor orientation data in degrees. For more information on the definition of yaw, pitch, roll: Yaw, Pitch, Roll and Omega, Phi, Kappa angles.

Xmp.Camera.SunSensorRoll

2.8909

Rational or Double

Sun irradiance sensor orientation data in degrees. For more information on the definition of yaw, pitch, roll: Yaw, Pitch, Roll and Omega, Phi, Kappa angles.

Xmp.Camera.SunSensorRelativeRotation

175, 0, 0

XmpSeq

Relative angle between camera and sunshine sensor in the omega, phi, kappa system (same as rig relatives).

Key

Value example

Type

Meaning

Xmp.Camera.TransformAlpha

{55684.1, 58672.8, 58889.1}

XmpSeq

Sequence of double, alpha parameter for each band.

This and the following two tags are used to undo a gamma transform which has been applied to fit data in 8bit space without losing the dynamic range:
pixel_final = alpha * pixel_normalized^gamma + beta;

where pixel_normalized is the pixel value stored in the JPG image scaled to the [0,1] interval.

Xmp.Camera.TransformBeta

{9850.9, 6862.2, 6645.91}

XmpSeq

Sequence of double, beta parameter for each band.

Xmp.Camera.TransformGamma

{2.12109, 2.6243, 2.33549}

XmpSeq

Sequence of double, gamma parameter for each band.

Key

Value example

Type

Meaning

Xmp.Camera.SensorBitDepth

14

Short

Bit depth of the original sensor

Xmp.Camera.SensorTemperature

43.4

Double

Temperature of the sensor (degree Celcius)