This option is used to calculate the radius vector of maplets, the spacecraft vector, and the spacecraft pointing. In the menu shown below, V is the radius vector to the maplet, Z is the pixel/line image space locations of the landmark (i.e. the image alignment), and PTG/SCOBJ refers to the spacecraft pointing and position, nominal refers to the "initial" space pointing and position.

Main Menu: Q 0123O IUCRSG NVAMBX DEPL FZH? v
 >v                                                                               

 1.  V from Z and pointing
 2.  Z from V and pointing
 3.  PTG/SCOBJ from Z and V (selected image)
 4.  PTG/SCOBJ from Z and V (current images)
 5.  PTG/SCOBJ from nominal (selected image)
 6.  PTG/SCOBJ from nominal (current images)
 7.  RA/DEC/TW (selected image)
 q.  Quit

1. V from Z and pointing - Calculates the radius vector from the image alignment and the spacecraft data. This is the most commonly used "v" option.

2. Z from V and pointing - Moves images to the alignment predicted by the radius vector and the spacecraft position/pointing.

3. PTG/SCOBJ from Z and V (selected image) - Determines the spacecraft position and pointing based upon the image alignment and radius vector of the maplet. Make sure you have a stable system before you do this! You can move the spacecraft in the wrong direction if you are not careful! This option will ask you to input a specific image on which to perform this calculation.

4. PTG/SCOBJ from Z and V (current images) - Similar to option 3 above, but does the calculation for all images added to the landmark.

5. PTG/SCOBJ from nominal (selected image) - Resets the spacecraft position and pointing to the nominal (i.e. original values determined for the mission). This option does it for a single image.

6. PTG/SCOBJ from nominal (current images) - Same as option 5 above, but for all images associated with the loaded landmark.

7. RA/DEC/TW (selected image) - Work in progress. Determines the inertial space orientation of the body-fixed frame (TIPM) at an image UTC with the experimental subroutine IPL2RDT and writes the orientation as RA, DEC, TWIST. This is the wobble program(?) R. Gaskell is developing.

Common Usage

A large portion of the time will only be using option v1, but v4 is used after the model is stable to update the s/c information, and v2 can be helpful when images are not aligning properly. V2 can also be used when you suspect there is something wrong with the model. If the model has problems, the v2 option will manifest by wildly moving the image around.

Note: This process reads the current .LMK and/or .SUM files as part of the processing so if any changes have been made, the landmark should be updated (process U) first.