! Define datum
! Datum is not used in levelling by height differences (any datum will suffice)
! 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; M; D


! Station to be fixed in 1D. Use _HGT_FIX line for each fixed station
_HGT_FIX; BOB



! Indicates the type of adjustment
_ADJUST_1D_HGT


! Adjust using weights derived from observation standard deviation
_ADJUST_1D_WGT; 2


! 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


! Confidence level for reporting - 95%
_ADJUST_CONFIDENCE_LEVEL; 0.95


! Define all or simply the known station coordinates here (use _ADJUST_CREATE_MISSING_STATION when not defining all stations)
!_ADJUST_CREATE_MISSING_STATION 
!           Name;  Lat; Lon; OrthoHgt; EllipHgt; North; East; NorthSD; EastSD; HgtSD; CorrNE; CorrNH; CorrEH; DeflNS; DeflEW
_STA_COORD; BOB;   0;   0;   100.0;    0;        0.;    0.;   0;       0;      0.02;  0.;     0.;     0.;     0.;     0.
_STA_COORD; CINDY; 0;   0;   102.568;  0;        0.;    0.;   0;       0;      0.02;  0.;     0.;     0.;     0.;     0.
_STA_COORD; DEBRA; 0;   0;   107.669;  0;        0.;    0.;   0;       0;      0.02;  0.;     0.;     0.;     0.;     0.
_STA_COORD; ED;    0;   0;   103.841;  0;        0.;    0.;   0;       0;      0.02;  0.;     0.;     0.;     0.;     0.
_STA_COORD; FAYE;  0;   0;   100.576;  0;        0.;    0.;   0;       0;      0.02;  0.;     0.;     0.;     0.;     0.
_STA_COORD; GABE;  0;   0;   99.554;   0;        0.;    0.;   0;       0;      0.02;  0.;     0.;     0.;     0.;     0.


! These should not be used during adjustment based on Setups or Distance (only use when using observation standard deviations)
! Add the centering errors for the obs that follow. 
_C_HGTDIFF; 0.02; 0.03


! Observations
!             AT Name; TO Name;  Hgt Diff;  Hgt Diff SD 
_OBS_HGTDIFF; BOB;     CINDY;    2.56916;   0.050
_OBS_HGTDIFF; BOB;     GABE;    -0.44714;   0.10
_OBS_HGTDIFF; CINDY;   DEBRA;    5.09749;   0.075
_OBS_HGTDIFF; CINDY;   FAYE;    -1.98974;   0.045


! These should not be used during adjustment based on Setups or Distance (only use when using observation standard deviations)
! Change the centering errors for the obs that follow. 
_C_HGTDIFF; 0.05; 0.01


! Observations
!             AT Name; TO Name;  Hgt Diff;  Hgt Diff SD 
_OBS_HGTDIFF; DEBRA;   ED;      -3.82921;   0.055
_OBS_HGTDIFF; ED;      FAYE;    -3.26777;   0.068
_OBS_HGTDIFF; FAYE;    GABE;    -1.02169;   0.085