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Calculations - Resection

A Resection Calculation can be used when the only known control is far away and a start point is needed for searching closer ground control (Normally Hidden). This Calculation uses Blunt's Method and is NOT a Least Squares Adjustment. Blunt's Method normally only requires 3 observations but for this service a forth observation must be entered for error checking.

There are some adjustment happening on a small scale. The resection is determined by 4 points and thus 4 combinations of 3 points are obtainable. Each 3 point resection is determined by an orientation correction and the mean of the 3 possible intersections from the respective points. At the end, the results are determined by the mean of the 4 possible resections.

The co-ordinates for all 4 resection combinations are displayed for detection of gross errors and then the Standard Deviations for all meaned results are also displayed for further quality inspection.

Resections are not always that precise and even with a Least Squares Adjustment with a lot of redundant observations, results can still vary. The precision of a resection is determined by the quality of the observations. This Resection calculation should not be used for absolute positioning but rather as a start point for the searching of other control.

Point 1

         Point 2

 

Y Co-ordinate

 X Co-ordinate Y Co-ordinate

X Co-ordinate

Direction to Point 1

Direction to Point 2

Use 4 decimal Notation

   Use 4 decimal Notation

 
(Eg: 123º12'12" = 123.1212)   (Eg: 123º12'12" = 123.1212)  

Point 3

       Point 4

 

Y Co-ordinate

 X Co-ordinate Y Co-ordinate

X Co-ordinate

Direction to Point 3 Direction to Point 4

Use 4 decimal Notation

   Use 4 decimal Notation

 
(Eg: 123º12'12" = 123.1212)   (Eg: 123º12'12" = 123.1212)  

Results

      

 

Y Co-ordinate

 X Co-ordinate    

 
     
  
Calculation Information:
Calculation Y Co-ordinate X Co-ordinate Orientation Correction
Resection 1, 2, 3:      
Resection 1, 2, 4:      
Resection 1, 3, 4:      
Resection 2, 3, 4:      
Mean:      
St.Dev:      

Spatial Reference is constantly looking for more ways to maintain a high level of security for account data and information, but accept no responsibility for the theft or leak of information. Spatial Reference encourage users to check data supplied by this service against your companies Accuracy Standards and accept no responsibility for the misinterpretation of the data and errors caused by using data supplied by this Service.