Field Observation Resection

You can take a series of observations in the field to resect the current setup position.

Rules:
1. All resection observations must appear sequentially.
2. You must have a minimum of one obs and a maximum of 10 observations.

Example - Neutral File

NOTE    RESIDUALS PT ID=       505, dE=-.000, dN=-0.000, dH=0.000
NOTE    RESIDUALS PT ID=       502, dE=0.000, dN=0.001, dH=0.001
NOTE    RESIDUALS PT ID=       503, dE=0.000, dN=-0.001, dH=-0.001
STN        ID=400, HI=0.000, CO=STN, RESECTION HELMERT
XYZ        ID=400, E=2021.757, N=4965.651, H=102.398
SCALE             
SS         ID=505, HA=204.10554, VA= 92.37395, SD=  32.4305, HT=0.000, CO=RT-, EDM=  Stan,Tape, P.C=0.0344
SS         ID=502, HA= 26.07213, VA= 91.08022, SD=  60.9847, HT=0.000, CO=RT-, EDM=  Stan,Tape, P.C=0.0344
SS         ID=503, HA=171.45547, VA= 85.29092, SD=  44.5832, HT=0.000, CO=RT-, EDM=  Stan,Tape, P.C=0.0344
SS         ID=s510, HA= 91.05456, VA= 84.26151, SD=  36.0230, HT=0.000, CO=RT-BW, EDM=  Stan,None, P.C=0.0344
SS         ID=300, HA=171.04324, VA= 87.55116, SD=  24.1282, HT=0.000, CO=SWM-SW, EDM=  Stan,Roun, P.C=0.0000

The NOTE RESIDUALS PT ID indicates that points 505,502 and 503 are Resection observations.
When the Observations are read in, their 'Resection' flag is set.

During reduction the Resection calculation is done.

Calculation Method

The first few observations after a station setup are inspected to see if they are resection observations.
You must tick the 'Resection Obs' attribute on each observation.

Observations can be with a bearing only or a bearing and distance.
A minimum of three bearing observations are required to compute the resection.
A minimum of two bearing and distance observations are required for the calculation.

If more than three obs are present, a least squares solution is computed for the postion.