Explain the Field Procedure in Tacheometry Traversing.

• Reconnaissance
• Establishment of tacheometric closed traverse as per field requirement ensuring each instrument station should command a wide area. If the area is too large,link traverse and addition of triangles may also be prederred.

• A tacheometer is set up at the starting station. It is centered and levelled accurately. Height of instruments is Measured.
• The instrument is oriented with reference to any predetermined station (BS) by taking it's bearing.Horizontal angles of all nearby details are recorded in a field book. Index map and reference sketches are also prepared in field.

• Reconnaissance
• Establishment of tacheometric closed traverse as per field requirement ensuring each instrument station should command a wide area. If the area is too large,link traverse and addition of triangles may also be prederred.

• A tacheometer is set up at the starting station. It is centered and levelled accurately. Height of instruments is Measured.
• The instrument is oriented with reference to any predetermined station (BS) by taking it's bearing.Horizontal angles of all nearby details are recorded in a field book. Index map and reference sketches are also prepared in field.

• A back sight reading is taken on a nearby benchmark if available.If not,fly levelling should be done to know the RL of the instrument station. After completing the loop of fly levelling between bench mark and any nearby traverse station, loop levelling is conducted along the traverse to know the RL of all stations.
• Similarly other stations are connected and above steps are repeated.
• Horizontal distance, vertical distance, bearings are computed from field book. RLs of all points are calculated in a separate field book for the purpose of plotting. The points are plotted in the maps with suitable scale and Rls of the respective points are noted by taking the distances and RLs from the prepared table.The contour lines may be drawn by the method of interpolation.