Displaying and Studying Photos

Displaying Camera Symbols

 Each photo’s camera position and orientation (if known) can be displayed on the terrain using camera symbols. The symbol’s color also indicates either the photo’s collection or its status ((in original position, in calculated position, failed to calculate, or excluded by user). You can show all photos or you can filter which photos are displayed:

§   Display only the photos individually selected in the Photos list or the collections selected in the Project Tree.

§   Display only photos that cover a selected point on the terrain.

§   Display only photos that were not excluded from the project.

 To select specific photos from the Project Tree for viewing on the terrain, do any of the following:

§   In the Project Tree, select the check boxes of the collections you want to display. All of the selected collections' photos will be displayed.

§   In the Project Tree, select the required photo collection, and then in the Photos list, select the Visible check box of the required photos.

§   In the Project Tree, select the required photo collection, and then in the Photos list, select the required photos, and on the Photo tab, in the Selection group, toggle off Hide Symbol.

 To select photos for viewing that cover a selected point on the terrain, do the following:

1.       Do either of the following:

§   If you want to display all photos that intersect with a selected point based on original photo positions, on the Home tab, in the Photos group, click the arrow under Show Photos in Point and select Show Original Photos in Point.

§   If you want to display all photos that intersect with a selected point based on aerotriangulation calculations, on the Home tab, in the Photos group, click the arrow under Show Photos in Point and select Show Calculated Photos in Point.

2.       In the 3D Window, click the point of interest. All photos that cover the selected point are displayed.

3.       To (re)display all photos, on the Home tab in the Photo group, click Show All Photos.

 To display only photos that were not excluded from the project:

1.       On the View tab, in the Photos group, select Do not show excluded. All excluded photos and photos outside the currently defined AT area are hidden. SeeExcluding a Photo” in the “Photo Management” chapter for information about excluding photos.

2.       To (re)display excluded photos, on the View tab, in the Photos group, select Show excluded.

Selecting Camera Symbol Size and Color Coding

 To select a camera symbol size:

§   On the View tab, in the Photos group, in the Symbol size drop-down, select a size for the camera symbols that display for each photo.

 To select a camera color coding option:

§   On the View tab, in the Photos group, in the Photo color drop-down, select either of the following:

§   Color by status – Camera symbols are color coded based on photo status (in original position, in calculated position, failed to calculate, or excluded by user), according to the colors defined in Options’ settings. SeeSetting PhotoMesh Options” in the “Basic Concepts” chapter for more information.

§   Color by collection – Camera symbols are color coded according to collection, with a random color assigned to each collection’s camera symbol.

Navigating to a Photo

 To fly or jump to a photo:

1.       In the Project Tree, select the required photo collection, and then in the Photos list, select the required photo.

2.       On the Photo tab, in the Navigation group, select Fly to/ Jump to.

Note:       You can also fly to the selected photo by double-clicking it in the Photos list.

Viewing Photos in the Photo Viewer

 To view a photo in the Photo Viewer:

1.       In the Project Tree, select the required photo collection, and then in the Photos list, select the required photo. Only one photo can be viewed in the Photo Viewer at a time. The Photo tab is displayed.

2.       In the View group, click Photo Viewer. The Photo Viewer opens with the selected photo displayed.

3.       Use the Photo Viewer ribbon commands to zoom in and out or Fit to Window.

4.       If you want to see how many other photos have each of the features automatically identified in this photo, click Show Features. The photo’s features are color coded according to the number of other photos in which they appear:

§   Gray – Feature wasn’t found in any other photo (no match)

§   Yellow – Feature was found in one other photo

§   Green – Feature was found in two or more photos

Note:       This information is only available in Review mode after aerotriangulation was completed. SeeSetting Build Parameters and Processing the Build” in the “Building” chapter. Build steps after aerotriangulation do not need to be completed to view this information.

Show Features

Projecting a Photo on the Terrain

A photo can be projected on the terrain (including Lidar) to see if it fits the terrain imagery or to better understand the position of the photo. The projection of the photo can be based either on its original position or its calculated position. Only photos that have positioning (XY coordinates and altitude) and orientation (Omega, Phi, and Kappa) information can be projected based on original positions.

 To project a photo on the terrain in its original camera position:

1.       In the Project Tree, select the required photo collection, and then in the Photos list, select the required photo. The Photo (contextual) tab is displayed.

2.       On the Photo tab, in the View group, select Project Original. The photo is shown on the terrain, and the photo's Project Original check box is selected in the Photos list.

 To project a photo on the terrain from the camera position calculated through aerotriangulation:

1.       On the Home tab, in the Photos group, click the arrow under Show Photos in Point and select Show Calculated Photos in Point.

2.       In the 3D Window, click the point of interest. All photos that cover the selected point are displayed.

3.       In the 3D Window, select the required photo. The Photo (contextual) tab is displayed.

4.       On the Photo tab, in the View group, select Project Calculated. The photo is shown on the terrain, and the photo's Project Calculated check box is selected in the Photos list.

Clearing Review Data from the Terrain

 To clear review data:

§   On the Home tab, in the Review group, click Clean Review Data. This clears any photo projections from the terrain.

Showing the Coverage Map

The coverage map is a color-coded map displaying photo coverage in every point of the defined AT area. This enables you to identify which areas of the project have sufficient coverage and which require more. The AT area can be defined to include all the project’s photos or restricted to only the photos within a specific area on the terrain. See “Setting the AT (Aerotriangulation) Area” in this chapter for more information.

The map can display coverage based on either the original positions of the project’s photos or their calculated positions.

Note:   The coverage map may take some time to display the first time it is shown or after making changes to the project as PhotoMesh (re)calculates the photo coverage.

 

 To show a coverage map:

§   On the Home tab, in the Photos group, click the arrow next to Coverage Map. and select one of the following:

§   Coverage Map from Original

§   Coverage Map from Calculated

Coverage Map and Legend

In the coverage map, the AT area is color coded based on directionality and coverage.

§   Green – Best coverage from all 5 directions: nadir and 4 oblique.

§   Yellow – Sufficient coverage of 4 directions.

§   Orange – Three coverage directions, the minimum required.

§   Red – Two coverage directions.

§   Purple – One coverage direction.

§   Black – No coverage.

 

Showing the Connection Map

The connection map is a color-coded map that enables you to evaluate the quality of the AT. In the connection map, each point in the defined AT area is colored based on the level of interconnection of the photos that intersect with this point. A group of photos is considered interconnected if each photo in the group was directly or indirectly matched with every other photo. Even photos that do not precisely intersect  with the point in the defined AT area can be used to create an indirect connection, as long as they come close to intersecting with the point (i.e., if photos A and D precisely intersect with the point in the AT area, and photos B and C nearly intersect with the point, photo A can be connected to photo D via photos B and C, where A intersects with B which intersects with C, which intersects with D).

§   Green – All of the photos that intersect with this point are interconnected.

§   Red – 50% of the photos that intersect with this point are interconnected

Each point in the defined AT area is colored on the gradient between green and red, based on the percentage of photos that intersect with the point.

If the connection map indicates that insufficient photo matches were generated for certain points in the AT area, tie points can be used to manually create matches for these points. See “About Control Points” in the "Control Points" chapter for information.

You can also display the number of matches for each photo by selecting Number of Matches as the color coding option for the photos. See “Displaying Calculated Camera Positions for Tiles” in the “Reviewing Your Build” chapter for more information.

 To show a connection map:

§   On the Home tab, in the Photos group, click the arrow next to Coverage Map. and select Connection Map from Calculated.