====== The Ortho Menu ======

===== Introduction =====

{{strabo_ortho_mainmenu.gif|}}

The Ortho menu forms an interface to the Strabo ortho production tool.\\ The available functions automate the preparation and the creation of the orthorectified images.\\ When EO (external Orientation) and a DEM are available, all parameters are ready to start making orthorectified images.

The first menu 'Open Strabo Ortho Wizard...' function starts a wizard for the creation of rectified images for all the individual project images.

The second "Start Ortho Mosaic Dialog..." starts a dialog for the creation of a mosaic.

The third function "Mosaic Editor..." opens a dialog for the semi-automatic creation of cutlines, followed by mosaicing.





====== Open Strabo Ortho Wizard ======





===== Wizard Step 1: Define the Target Projection System =====

{{strabo_ortho_production_wizard.gif|{{strabo_ortho_production_wizard.gif|}}}}

Select the appropriate Projection system for the actual project.

Goto the next wizard step.

===== Wizard Step 2: Select Project Height =====

{{strabo_ortho_select_project_height.gif|}}

There are three options.
  - Fixed height:
    - The ground surface is set at a constant height.
  - Oriented Plane:
    - The ground surface is approximated by a best fit plane on the actual DEM points, which can be a very limited set of DEM points. 
  - Use TIN Based on DEM points:
    - A TIN (Triangulated Irregular Network) will be calculated and used as approximation for the ground truth.

===== Wizard Step 3: Add Breaklines =====

This dialog gives the opportunity to introduce datasets containing breaklines.
\\ These 3D vector datasets can be created using the Strabo Softcopy environment.

{{strabo_ortho_add_breaklines.gif|}}

===== Wizard Step 4: Select the target pixelsize. =====

{{strabo_ortho_select_the_target_pixelsize.gif|}}

Strabo proposes a GSD equal to the pixelsize on ground height expressed in m.
\\ Introduce the GSD of your choice, and forward to the next step.
\\ 


===== Wizard Step 5: Select a directory to save the results. =====

{{strabo_ortho_select_a_directory_to_save_the_results.gif|}}

Select the folder under which you want to save all the individual orthorectified images, using the "Browse" button.

===== Wizard Step 6: Execute Rectification. =====

{{strabo_ortho_execute_rectification.gif|}}

  - Select the images you want to rectify
  - Press the "Go!" button
  - The progress bar shows the actual progress regarding the rectification of the selected images.


This means, that you can rectify a subset af all the images.
\\ 
\\ After the recification you can con continue processing the mosaic.
\\ 


Press the {{wiz_finish.gif?20x20&nolink}} button to exit the wizard after all selected images are processed.

====== Ortho Mosaic Dialog======

{{strabo_ortho_mosaic_dialog.gif|}}

If all individual rectified images exist, and the cutlines are defined, then this dialog creates for you the final mosaic image.

  - Select the folder containing the individual orthorectified images.
  - Select the dataset containing the cutlines. These cutlines can be created using OrbitGIS or the "Mosaic Editor" dialog.
  - Enter the name for the mosaic.
  - Select the destination folder for the final mosaic.
  - Pixel size: introduce the GSD for the Mosaic expressed in meter.
  - Select a brightness setting.
  - Select or deselect the option to use color balancing.
  - Press the "Create" button to start processing the mosaic.

====== Mosaic Editor ======

Selecting this menu function will first check for the availability of cutlines.\\ If they do not exist under a folder called "cutlines", then the next dialog will show up:


Next, the following editor will appear:

{{strabo_ortho_mosaic_editor.gif|}}