Creating Tie Points

Tie points can be created in either of the following ways:

§  By selecting in the Photos list the photos between which you want to establish a correspondence. The Control Point Editor opens with the Photos panel populated by the selected photos. You can also select photos after opening the Editor. See "Creating Tie Points in Selected Photos" in this chapter for information.

§  By creating a tie point from an easily identifiable location on the terrain. The Control Point Editor opens with the Photos panel populated by the photos whose frustum intersects with the created point. See "Creating Tie Points from Identifiable Locations on the Terrain" in this chapter for information.

After creating a tie point, you mark it in the relevant photos using the Control Point Editor. See "Marking Control Points in Photos" in this chapter for information.   

Creating Tie Points in Selected Photos

To create a tie point in selected photos:

1.     In the Project Tree, select the Photos group, and then in the Photos list, select the required photos.

2.     On the Photo tab, in the Tie Point group, click Create Tie Point. The Control Point Editor is displayed with the newly-created tie point selected in the control point table at the bottom of the Editor, and with a Custom selection in the Photos panel that includes all the photos selected in the Photos list.

Note:        You can also create tie points and filter the photos for sampling from the Editor itself: On the Home tab, in the Add group, click the arrow under Control Points and select Open Control Point Editor. Then on the Home tab of the Control Point Editor, in the Control Point group, click the arrow under Add New and select Add New Tie Point. See "Marking Control Points in Photos" in this chapter for information on filtering the photos for sampling.

3.     Set the tie point properties. See "Editing Control Points" in this chapter for information.

4.     Mark the tie point in the relevant photos, and then save the project. See "Marking Control Points in Photos" in this chapter for information. The Sampled Photos panel gradually becomes populated with photo thumbnails as you mark the tie point in photos.

Creating Tie Points from Identifiable Locations on the Terrain

To create a tie point from a specific location on the terrain:

1.     On the Home tab, in the Add group, click the arrow under Control Points and select Create Tie Point from Terrain.

2.     Click in the 3D Window to define the tie point’s position. The Control Point Editor is displayed with the Photos panel populated by photos whose frustum intersects with the tie point created. 

3.     Mark the tie point in the relevant photos. See "Marking Control Points in Photos" in this chapter for information. The Sampled Photos panel gradually becomes populated with photo thumbnails as you mark the tie point in photos.