! 2D Local Plane adjustment based on an approximate height for each station


! Define datum
! Datum Name; Semi-Major Axis; 1.0 / Flattening
_DATUM; NAD 83; 6378137.000000; 298.257222101


! Define the Units used in this file
! M - meters, U - US Feet, I - International Feet, C - Chains
! D - DMS, DD - Decimal Degrees, G - Grads (Gons), 
! Note: Lat and Lon must always be in DMS format (e.g., 100-30-40.1234 is entered as 100.30401234)
_UNITS; U; D


! Station 'AJAX' and 'DONNER' to be fixed in North(lat) and East(Lon). 
_LAT_NORTH_FIX;	A
_LON_EAST_FIX;  A


! Indicates the type of adjustment (Local Plane in this case)
_ADJUST_2D_LOCAL


! Define if unknown stations (referenced by observations) should be created at Adjust Time.
! Unknown stations are those not defined in the _STA_COORD record (see below).
_ADJUST_CREATE_MISSING_STATION


! All variances (squared standard deviation) will be multiplied by this value prior to adjustment
_ADJUST_APRIORI_FACTOR; 1.0


! Perform no more than this number of iterations when solving the adjustment. Most networks will
! converge within two to seven iterations when input data contains no major blunders. 
_ADJUST_MAX_ITER; 10


! Consider the adjustment completed, when the current iteration moves station coordinates less than
! this value (from the previous iteration).
_ADJUST_CONVERGE_CRITERIA; 0.001


! Confidence level for reporting - 95%
_ADJUST_CONFIDENCE_LEVEL; 0.95


! Disabled to use OrthoHgt field from each station
!_ADJUST_USE_ELLIPHGT


! Use a known approximate height for each station. This is not a mean height for the network. When
! using this option, you must provide an approximate height value at each station (scaled from a
! map if needed). For projects in highly variable terrain, this method is preferred over the usage
! of a mean project height.
_ADJUST_2D_KNOWN_HGT


! Approximate Lat and Lon for the project area. This information is used to make corrections
! for curvature and for the reduction of 3D observations to 2D observations.
_ADJUST_APPROX_LAT_LON; 40.0; -120.0


!           Name; Lat; Lon; OrthoHgt; EllipHgt; North;   East;    NorthSD;   EastSD;    HgtSD;     CorrNE; CorrNH; CorrEH; DeflNS; DeflEW
_STA_COORD; A;    0;   0;   877.0;    0;        20000.0; 20000.0; 0.0001;    0.0001;    0.0001;    0.;     0.;     0.;     0.;     0.
_STA_COORD; B;    0;   0;   876.0;    0;        0;       0;       0.0001;    0.0001;    0.0001;    0.;     0.;     0.;     0.;     0.
_STA_COORD; C;    0;   0;   880.0;    0;        0;       0;       0.0001;    0.0001;    0.0001;    0.;     0.;     0.;     0.;     0.
_STA_COORD; D;    0;   0;   870.0;    0;        0;       0;       0.0001;    0.0001;    0.0001;    0.;     0.;     0.;     0.;     0.
_STA_COORD; E;    0;   0;   870.0;    0;        0;       0;       0.0001;    0.0001;    0.0001;    0.;     0.;     0.;     0.;     0.
_STA_COORD; F;    0;   0;   880.0;    0;        0;       0;       0.0001;    0.0001;    0.0001;    0.;     0.;     0.;     0.;     0.



! Set Bearing SD's (standard deviations) to 5.0 seconds when file is loaded
_G_BEAR_SD; 5.0


! Set Horizontal Angle SD's to 5.0 seconds when file is loaded
_G_HA_SD; 5.0


! Set Zenith Angle SD's to 5.0 seconds when file is loaded
_G_ZEN_SD; 5.0


! Set Chord (slope) Distance SD's to 0.005 meters (5mm) when file is loaded
_G_CHORD_SD; 0.005


! Observation set format 
!             AT Name;  TO Name;  BS Name;  HorAng      SD;    Zenith;   Zenith SD;  chord;    Chord SD;  InstrHgt;  TargHgt
_OBS_HA_SET;  A;        B;        F;        298.0213;   0.001; 90.0609;  0.001;      553.815;  0.050;     0;         0
_OBS_HA_SET;  B;        C;        A;        176.2749;   0.001; 88.4829;  0.001;      184.205;  0.050;     0;         0
_OBS_HA_SET;  C;        D;        B;        301.395400; 0.001; 92.2139;  0.001;      126.840;  0.050;     0;         0
_OBS_HA_SET;  D;        E;        C;        240.164300; 0.001; 90.0210;  0.001;      377.025;  0.050;     0;         0
_OBS_HA_SET;  E;        F;        D;        165.080900; 0.001; 88.3505;  0.001;      218.070;  0.050;     0;         0
_OBS_HA_SET;  F;        A;        E;        258.250700; 0.001; 90.3952;  0.001;      195.460;  0.050;     0;         0


! Observation set format 
!              AT Name;  TO Name;  Bearing   Bearing SD  Quadrant  Hor Dist;  Hor Dist SD
_OBS_BEAR_SET; A;        F;        18.0637;  0.001;      SE;       195.438;   0.005