Fixing Landmarks

Image of thing to try:

When to Fix Landmarks

At the end of each tiling or iteration, a form of find_nofit (T or P) is used to check for bad landmarks.

A common find_nofit output will look soemthing like this:

EQ0004:   cat 004.OOT 
EP0002:   cat 005.OOT 
EP0003:   cat 006.OOT 
EO0003:   cat 007.OOT 
EN0003: * cat 008.OOT 
EN0004: * cat 009.OOT 
EM0003: . cat 010.OOT 
EM0004: * cat 011.OOT 
132 deleted
   !  cat 132.OOTThe 

The Four main types of find_nofit outputs are:

• ! - the landmark was deleted
• . - the landmark has overlaps
• (space) - the landmark has minor error (don't worry about it).
• * - the landmark has a major error and must be fixed.

All errors are worth recording, but the only output from find_nofit that warrants serious concern is *. Whenever a * is present in the find_nofit output the landmark that * is associated with must be fixed. To fix bad land marks lithos is used in the working directory.

How to Fix Landmarks

Once a problem landmark is identified, the executable lithos can be entered in the working directory to fix the landmark. The steps to do this are as follows:

1. The first major step in fixing a bad landmark is to select that landmark within lithos. As an example, the landmark EM0004 in the find_nofit output above has major errors. To select this landmark the following commands are entered in the lithos executable:

i
EM0004
n
n

The output of these commands looks like this:

Current landmark = NONE  
Main Menu: Q 0123O IUCRSG NVAMBX DEPL FZH? i
 >i                                                                               

 Input 6-character landmark name.[Q]
EM0004
    -0.31014     0.47683    -0.31113     0.29307

 gc slope.pgm


 Check for more images? y[n]
n
 Include a single image? y[n]
n

With the landmark now selected