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TerraPhoto User Guide

Navigation: Project Workflow > Working with Tie Points > Point pulldown menu

Add known line

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Add known line

Add known line command lets you enter a new Known line. Known line tie lines are entered based on points for which the xyz coordinates of one point along a linear feature are known, for example, control points on a linear paint marking. The coordinates can be defined by snapping to vector elements drawn into the CAD file or by typing a key-in commandMicroStation or SpaccelSpatix.

Known lines can be placed manually or in automatic entry mode depending on the setting in the command’s dialog.

To enter a new known line:

1. Select Add known line command from the Point pulldown menu.

The Add Known Line dialog opens:

tie_add_known_line

2. Select the Entry mode : Manual or Auto line search. Define Line width values if Entry mode is set to Auto line search. The Line width defines the distance from the tie line within which the software tries to place tie line pixels automatically.

3. Enter the position of the known xyz point with a data click in a CAD file view. You may snap to a vector element drawn in the CAD file in order to get the exact coordinates of the known point.

Alternatively, you can type a key-in commandMicroStation or SpaccelSpatix with the exact coordinates:

xy=212457.65,670960.11,73.45        MicroStation

xy=212457.65:670960.11:73.45        Spatix

The application adds the tie line to the list in the Tie points window. If Entry mode is set to Auto line search, the software tries to place the tie line in all images automatically. If all tie line pixels are found correctly, you can continue with step 3 in order to place the next Known line.

The tie line pixels are undefined at this stage if you are using the manual entry mode. The software selects the active image and updates the Active detail view in order to show the tie line position.

4. Enter the tie line position with two data clicks in the Active detail view.

The software selects the next image with an undefined tie line pixel in the list and updates the Secondary detail view in order to show the tie line position.

5. Enter the tie line position with two data clicks in the Secondary detail view.

The application recomputes the solution point for the tie line and displays the current mismatch for each image. It selects the next image with an undefined tie line pixel in the list and updates the Secondary detail view in order to show the tie line position.

6. Continue with step 5 until all tie line pixels are defined.

7. After entering the last pixel of a tie line, you can continue with step 3 if you want to place the next Known line.

If the tie line position can not be defined in one of the secondary images, you should select the next undefined pixel for this tie line and continue entering the tie line pixels. Use the Clean command from the Point pulldown menu in order to remove undefined pixels from a selected tie line.

TerraPhoto User Guide   05.07.2021   © 2021 Terrasolid Ltd