! SAMPLE: 
! 3D Local Network
! Orthometric Height (with approx geoid height correction)
! Hor Angle, Zenith, Chord (Slope Distance) and Azimuth Obs




! Define datum
! Datum is used to correct for curvature corrections, mark to mark reductions, etc.
! 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 Grid North and East
_LAT_NORTH_FIX;   A
_LON_EAST_FIX;    A
_HGT_FIX;         A




! _ADJUST_ keywords
! Keywords starting with _ADJUST_ are used in the Adjust From File option; they are ignored during Import.

! Indicates the type of adjustment (3D Local)
_ADJUST_3D_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


! Approximate latitude for curvature corrections, mark to mark reductions, GPS, etc.
_ADJUST_APPROX_LAT_LON; 45.0; -120.0


! When adjusting a 3D network by orthometric height, you can optionally provide the approximate 
! geoid height for the project area. The reason is that geodetic computations are based on ellipsoidal 
! height not orthometric height. For projects with long distances between points, using ortho heights 
! will result is a slight distance scaling error. Providing an approximate geoid height for the project 
! will allow approximate ellipsoidal heights to be used, thereby eliminating most of this scaling error. 
! FOR THIS PROJECT, THE APPROX GEOID HEIGHT OF -20 MADE NO DIFFERENCE IN THE RESULTS. THIS IS DUE
! TO THE POINTS BEING VERY CLOSE TO EACH OTHER (SHORT DISTANCES BETWEEN POINTS).
_ADJUST_APPROX_GHGT; -20.0  




! Define all or simply the known station coordinates here (use _ADJUST_CREATE_MISSING_STATION when not defining all stations)
!           Name;  Lat;  Lon;  OrthoHgt;  EllipHgt;  North;       East;        NorthSD;    EastSD;     HgtSD;      CorrNE;  CorrNH;  CorrEH;  DeflNS;  DeflEW
_STA_COORD; A;     0;    0;    1000.000;  980.000;   10000.000;   10000.000;   0.001;      0.001;      0.001;      0;       0;       0;       0;       0




! Observations
! Note: The small SD for azimuth effectively holds the azimuth fixed during adjustment.
!             At Name;  To Name;  Azimuth;     Az SD;   Zenith;   Zenith SD;   Chord (Slope);  Chord SD;  Instr Hgt;  Targ Hgt
_OBS_AZ_SET;  A;        D;        0.0;         0.001;   93.0;     25.0;        106.25;         0.05;      0.0;        0.0

! Observations
!             At Name;  To Name;  Bs Name;  HorAng;     HorAng SD;  Zenith;     Zenith SD;  Chord (Slope);  Chord SD;  Instr Hgt; Targ Hgt
_OBS_HA_SET;  A;        B;        D;        90.0000;    20.0;       88.0000;    25.0;        93.7500;       0.050;     0.0;       0.0
_OBS_HA_SET;  B;        C;        A;        90.0000;    20.0;       89.0000;    25.0;       106.8750;       0.050;     0.0;       0.0
_OBS_HA_SET;  C;        D;        B;        89.3230;    20.0;       96.3100;    25.0;        94.2980;       0.050;     0.0;       0.0