Property

Description

Collection

Name

Name of the collection in the Photos list.

Coordinate System

Coordinate system of the collection. Click Select  to set a different coordinate system. See "Coordinate System" in the "Basic Concepts" chapter for more information.

Orientation Method

Select which system to use to set orientation: OPK (Omega, Phi, Kappa) or YPR (Yaw, Pitch, and Roll). This selection determines which fields are displayed in the Advanced Position section of the property sheet.

Altitude Type

When both relative and absolute altitude data were provided, this property sets the altitude method to be used by the collection. Select Relative to Terrain to place the collection at a specified altitude above the ground. Select Absolute to place the collection at a specified altitude above the terrain database vertical datum base ellipsoid.

Relative Altitude

If "Relative" was selected as the Altitude Type, this defines the altitude above the ground.

Camera

Focal Length Normalization

Camera properties used to set the focal length.

Select one of the following options:

§  Focal length and sensor width

§  Focal length and pixel size

§  Focal length 35

Sensor Width

Size of the camera sensor in millimeters.

Pixel Size

Size of a physical pixel on the camera sensor in millimeters.

Focal Length

Focal length in millimeters.        

Focal Length 35

Equivalent focal length in millimeters for a 35 mm film camera.

Principal Point Reference

Origin and units of the principal point. Select one of the following:

§  Top left in pixels – Positive x-direction is to the right and positive y-direction is downwards.

§  Top left in mm – Positive x-direction is to the right and positive y-direction is downwards.

§  Center in pixels – Positive x-direction is to the right and positive y-direction is upwards.

§  Center in mm – Positive x-direction is to the right and positive y-direction is upwards.

Principal Point X

Principal point X value in pixels or mm according to principal point reference.

Principal Point Y

Principal point Y value in pixels or mm according to principal point reference.

Width

Width of photo in pixels.

Height

Height of photo in pixels.

Gamma

Brightness of the photo’s colors. The default value of 1 leaves the color unchanged. Values >1 brighten the colors, while values <1 darken them.

Effective Range

Maximum distance from the camera position for which photo information is considered valid for the aerotriangulation.

Calculated Effective Range

Whenever the Effective Range parameter value is not provided, PhotoMesh calculates the maximum distance from the camera for which photo information is considered valid for the aerotriangulation, and then displays and uses this value.

Crop Area

Percentage of the photo to use in the project. Blurry or obstructed areas on the edges of a photo will be cropped based on this property value.

Use in Textured Model

Select the check box to include this collection in the textured model.

Use in Orthophoto

Select the check box to include this collection in the orthophoto.

Use as Reference Only

Select the check box to include this collection only in the reference project. See "Adding a Reference Project to Use in Aerotriangulation" in the "Control Points" chapter for information.

Use in Point Cloud

Select the check box to include this collection in the point cloud output.

Bands – Multispectral

Note:    The band information is retrieved from the collection information in the photo list Excel or XML, the collectionProperties XML, or from the first photo in the collection. See "Loading a Photo List File" and "Loading Photo Files from Disk" in the "Photo Management" chapter. You can manually set the value for each band in the property sheet.  

Multispectral Bands

Multispectral bands in the collection’s photos. These bands can be used in texturing the 3D model and in generating the orthophoto. See "Setting Advanced Reconstruction Parameters" in the "Building" chapter.

1

Select the first band.

2

Select the second band.

3

Select the third band.

Camera Distortion (Optional)

Radial and tangential distortion calculated using the Brown-Conrady model. See here for more information.

K1

Defines the 1^st radial distortion coefficient.

K2

Defines the 2^nd radial distortion coefficient.

K3

Defines the 3^rd radial distortion coefficient.

P1

Defines the 1^st tangential distortion coefficient.

P2

Defines the 2^nd tangential distortion coefficient.

Advanced Position (Either OPK or YPR offset and flip values will be displayed, depending on your selection above for Orientation Method)

Altitude Offset

Offset from the current altitude value.

Omega Offset

Offset in degrees along the Omega axis from the photo's provided angle. Applied before any additional rotation and prior to calculating position/orientation, this property helps correct orientation discrepancies between a camera and the plane on which it is mounted.

Phi Offset

Offset in degrees along the Phi axis from the photo's provided angle. Applied before any additional rotation and prior to calculating position/orientation, this property helps correct orientation discrepancies between a camera and the plane on which it is mounted.

Kappa Offset

Offset in degrees along the Kappa axis from the photo's provided angle. Applied before any additional rotation and prior to calculating position/orientation, this property helps correct orientation discrepancies between a camera and the plane on which it is mounted.

Yaw Offset

Offset in degrees along the Yaw axis from the photo's provided angle. Applied before any additional rotation and prior to calculating position/orientation, this property helps correct orientation discrepancies between a camera and the plane on which it is mounted.

Pitch Offset

Offset in degrees along the Pitch axis from the photo's provided angle. Applied before any additional rotation and prior to calculating position/orientation, this property helps correct orientation discrepancies between a camera and the plane on which it is mounted.

Roll Offset

Offset in degrees along the Roll axis from the photo's provided angle. Applied before any additional rotation and prior to calculating position/orientation, this property helps correct orientation discrepancies between a camera and the plane on which it is mounted.

Flip Omega

Flips the Omega axis.

Flip Phi

Flips the Phi axis.

Flip Kappa

Flips the Kappa axis.

Rotate Yaw

Additional rotation along the Yaw axis in degrees, that is performed in YPR order after the photos' OPK or YPR orientation and offsets were applied

Rotate Pitch

Additional rotation along the Pitch axis in degrees, that is performed in YPR order after the photos' OPK or YPR orientation and offsets were applied

Rotate Roll

Additional rotation along the Roll axis in degrees, that is performed in YPR order after the photos' OPK or YPR orientation and offsets were applied

Accuracy

Note:    The "Use build settings" option for the properties below sets the accuracy value based on the build settings for the project. For more information on this and other accuracy parameter options, see "Setting Advanced Aerotriangulation Parameters" in the "Building" chapter for information.

Ignore Orientation

Ignore the orientation value.

Horizontal Accuracy Factor

Weight to assign to the photos’ provided XY coordinates in determining the calculated XY values. This ranges from Very High - External AT (Factor = 100) to Unreliable (Factor = 0).

Vertical Accuracy Factor

Weight to assign to the photos’ provided altitude in determining the calculated altitude value. This ranges from Very High – External AT (Factor = 100) to Unreliable (Factor = 0).

Focal Length Accuracy

A percentage that indicates the allowable deviation from the provided focal length value when calculating the AT. This represents the accuracy of the provided focal length. This ranges from Use Input Value to Unreliable.

Principal Point Accuracy

A percentage that indicates the allowable deviation from the provided principal point when calculating the AT. This represents the accuracy of the provided principal point. This ranges from Use Input Value to Unreliable.

Radial Accuracy

Radial accuracy. It is generally recommended to select the "Standard" option. If your data was captured with a professional camera that automatically applied a radial distortion correction (i.e., the original distortion value is extremely accurate), select "Use input value".

Tangential Accuracy

Tangential accuracy. It is generally recommended to select the "Standard" option. If your data was captured with a professional camera that automatically applied a tangential distortion correction (i.e., the original distortion value is extremely accurate), select "Use input value".

Calculate Camera Parameters

Method of calculating the camera’s intrinsic parameters.

§  Use Build Settings – Use the method selected in the "Calculate Camera Parameters" AT build parameter.

§  Entire collection – Calculate the AT so that the camera intrinsic properties are the same for all photos in the collection.

§  Per photo – Calculate the camera intrinsics individually for each photo in the collection.

Note:    Parameters should be calculated per photo when not all of a collection’s photos were taken by the same physical camera with identical focal length and principal point.