8.2 SKIP file
The SKIP file is created by RELAX and BINGO. It contains information about photo measurements which have to be skipped or to be re-activated.
As far as RELAX or BINGO identify photo measurements as wrong, those measurements are listed in the SKIP file in a SKIP statement. The program SKIP reads this file and marks exactly these measurements in the IMAGE COORDINATE file with an ″S″ in column 1. A measurement marked like that will be ignored by RELAX. In BINGO, such a measurements with weight Zero takes part in the adjustment, i.e. the measurement does not influence on the result. The residuals for these measurements are computed for checking purposes.
If the control shows, that this measurement had been rejected without any good reasons, BINGO lists these measurements in the SKIP file in an UNSK statement. Then SKIP removes the ″S″ in column 1 during the next run.
Before the SKIP carries out the changes in the IMAGE COORDINATE file, the existing file is renamed to old-image.dat.
*1 *2 Photo measurements skipped by RELAX *3 *4 <_____Point____><_____Photo____><__LINE__><_Bl_/_#_> *5 SKIP 1002 265 0 2_1 SKIP 1002 266 0 2_2 SKIP 1002 267 0 2_1 SKIP 9336 268 0 2_1 SKIP 9336 269 0 2_2 SKIP 9336 270 0 2_1 |
Example for a SKIP file of RELAX |
Despite of point name and photo name, RELAX writes also a counter per line (column ″No″), indicating in how many models the point had been skipped as well as the corresponding block number (column ″Bl″).
This counter is an indicator for error probability. During the relative orientation it can only be recognised, if the measurements of the left and right photo fit together. If this is not the case, both measurements have to be taken as wrong, as there is no possibility to realise which one is wrong. But if a measurement attracted attention twice, it can be assumed to be wrong with high probability (see above example).
*1 *2 Gross data errors detected by BINGO *3 *4 <______Point___><______Photo___><__LINE__><___Rays_><__Wi_/_Vi_> *5 UNSK 1002 265 0 13 8.8 UNSK 1002 267 0 13 8.8 UNSK 9336 270 0 10 6.1 SKIP 8223 8023 0 5 5.6 SKIP 324 9035 0 4 4.0 Control Pt. SKIP 10103 10011 0 4 6.9 |
Example for a SKIP file of BINGO |
Despite of the point name and the photo name, BINGO writes also per line the number of photos for the point (column ″Rays″) as well as the normalised residual wi (compare Section 2.3.2.3) respectively the residuals vi. If one of the points is a control point there will be a comment behind the last value in that line.
Before the RELAX or BINGO programs overwrite an existing SKIP file, the old file is renamed old-skip.dat.
The program SKIP offers a further possibility for processing:
By the RENU statement also a renaming of points is possible. It has the following content:
* (_Old_Name_) (_Photo_) (_Line_No_) (_New_Name_) RENU 1002 260 0 4812 |
Example for a RENU statement |