Importing GPS/INS or exterior orientation data from a text file

Under Projection, type the projection string for the source data (for example, UTM 17 T D000) in the text box beside the Earth Model button or click Set Input Projection based on Output Projection if your input projection is the same as your output projection. If you do not know the projection string:

Select a projection type from the Input projection list. (For UTM, State Plane Coordinate Systems (SPCS), or Other projection types, additional windows may open automatically for you to select the parameters to define the projection or click More to open these windows. Select the parameters and click Accept.)
Click Earth Model.
Click either the Datum or Ellipsoid tab.
Click a datum or an ellipsoid.
Click Accept.

In Input Angle unit, select the unit for the orientation angles that are used in the text file. Click:

Degree if the file expresses the angles in degrees. If a circle is divided along its radius into 360 equal parts, a degree is the angle between two adjacent radii measured at the center of the circle.
Radian if the file expresses the angles in radians. A radian is a unit used to measure angles where 2 pi radians equals the 360 degrees in a circle. Therefore, one radian equals approximately 57.29577951 degrees.
Grads if the file expresses the angles in grads. A grad is a unit used to measure angles where 400 grads equals the 360 degrees in a circle. Therefore, a 90-degree right angle equals 100 grads.
DMS if the file expresses the angles in Degrees Minutes Seconds. DMS is a unit used to measure angles where a degree is divided into equal parts. A circle contains 360 degrees. Each degree is divided into 60 sections called minutes. Each minute is also divided into 60 sections, which are called seconds. Therefore, each angle is described by a number of degrees, minutes, and seconds.

In the File format list, click the space-delimited string that represents the layout of the data in the text file. For example, the string ImageID X Y Z represents the layout. The first column is the image ID number, the second column is the x coordinate, the third column is the y coordinate, and the fourth column is the z coordinate. Estimated errors in the coordinates and the orientation are represented by values; such as eX, eY, eZ, and so on.

In Accuracy, enter the estimated error for orientation parameters in the eX, eY, eZ, eOmega, ePhi, and eKappa boxes, if available. The eX, eY, and eZ are measured in projection units, and the eOmega, ePhi, and eKappa are measured in decimal degrees. The data set or GPS/INS sensors usually contain the estimated accuracies. The estimated error values are used to automatically weight the exterior orientation data with GCPs and tie points during the computation of the math model. The estimate errors entered in the eX, eY, eZ, eOmega, ePhi, and eKappa boxes are also used to constrain positioning of the exterior orientation data in the math model solution.

In the Text file box, type the path or click Browse to select the text file that contains the orientation parameters.

Under Flight line information, enter the the break angle of the flight line, in degrees, in the Flight line break angle (degrees) box.

OrthoEngine will recognize the value as the delta kappa in which a new flight line has begun. For example, if the kappa changes in angle by more than 20 degrees between scenes, entering a value of 20 means that a new flight line will be created.

The table under Extracted Data shows the contents of the exterior orientation extracted from the source text file. To remove the unsatisfactory exterior orientation data for an image, select the Image ID and click Delete.

If you need to rotate the Kappa value, select the images under Extracted Data or select Select All to rotate all the images. In Rotate kappa, click a rotation button to rotate the images as required.

Click Import.

If you have more than one file containing the exterior orientation parameters, repeat step 3 to step 10 for each file.

When you have imported all the exterior orientation parameters, click OK.