E D T O B S

This program may be used to edit the observation records in file INTCOBS (INTERCONNECTING OBSERVATIONS). The edited data is written to a binary file EDITOBS (EDITED OBSERVATIONS).

The observation file will contain a combination of the following records

• Code 1 direction records
• Code 51 sigma direction records
• Code 2 distance records
• Code 52 sigma distance records
• Code 3 azimuth records
• Code 53 sigma azimuth records
• Code 14 elevation difference records
• Code 54 sigma elevation difference records
• Code 95 position equation record groups
• Code 96 Geographical coordinate records
• Code 92 Cartesian coordinate records
• Code 94 Auxiliary parameter definition
• Code 97 Header for covariance records
• Code 91 position difference record groups
• Code 41 Cartesian coordinate difference records
• Code 93 partially reduced normal equation record groups.
• Code 92 partially reduced right hand side coefficients
• Code 96 Geographic adjusted coordinate records

These record types are explained in the user documentation.

The program edits the observation records for legitimate fields of data. The observation is then compared against a value as computed from the input coordinates. Values above an input threshold are listed and values 10 times this are listed as errors. ( If a consistent set of input coordinates is used this information may be of value if problems arise later on in the adjustment) The program completes the computation of observation standard deviation using the Sigma record if a matching type is found or alternately uses the standard deviation on the record. Errors and warnings are listed on the file EDTOBS.LIS.

The program will list a summary of the data that can be used as a check in subsequent adjustments for completeness of data or as a quick check that the same data set has been used.

 ***** WARNING - Record  1665[  2B86 756043  PIR             756031  MEZ                 11622.03000   0.00000]
         Non-Standard Instrument Code (B86) assumed TAPE (B) - Marker Distance =    11624.46619

     
    Summary of file EDITOBS
    =======================
    Number of Direction observations   =       256      1054       446185027.4         819.7831195    
    Number of Distance  observations   =       557       557       10507753.71         2.428556938    
    Number of Azimuth   observations   =        10        10       7705822.000         12.91486200    
    Number of Position Equations       =         0         0      0.0000000000E+00    0.0000000000E+00
    Number of Position difference eq.  =         0         0      0.0000000000E+00    0.0000000000E+00
    Number of Partial reduced N.E.     =         0         0      0.0000000000E+00    0.0000000000E+00
    Number of Elev. diff. observations =         0         0      0.0000000000E+00    0.0000000000E+00
    Maximum set of observations        =        12
    Maximum set of position equations  =         2
    Maximum block size                 =         9

This is normally the step following either the VALDEK step or the READCC and EDTPOS steps creating the ADJSUMY file, the STADATA file and the NUISPAR file.

This step preceeds the PERMIN procedure used to minimize the normal equation profile and thus reduce the time required to compute the adjustment.

Example.

  cd /ghost/data/sudbury    <-- Go to the data directory
  EDTOBS              <-- Execute the Edtobs procedure
  edit EDTPOS.LIS     <-- Examine the listing for errors