Before the commencement of any survey work, the area to be surveyed is thoroughly examined by the surveyor, who then thinks about the possible arrangement of the framework of survey. This primary investigation of the area is termed as reconnaissance survey or reconnoitre.
During reconnaissance survey, the surveyor should walk over the area and note the various obstacles and whether or not the selected stations are intervisiable. The main stations should be so selected that they enclose the whole area,. The surveyor should also take care that the triangles formed are well conditioned. He should note the various objects which are to be located.
The neat hand sketch of the area which is prepared during reconnaissance survey is known as the index sketch or key plan. The index sketch shows the skeleton of the survey work. It indicates the main survey stations, sub-station, tie stations, base line, arrangement for framework of triangles documents for the surveyor and for the person who will plot the map. It should be attached to the starting page of the filed book(Fig. 2.2)
The neat hand sketch of the area which is prepared during reconnaissance survey is known as the index sketch or key plan. The index sketch shows the skeleton of the survey work. It indicates the main survey stations, sub-station, tie stations, base line, arrangement for framework of triangles documents for the surveyor and for the person who will plot the map. It should be attached to the starting page of the filed book(Fig. 2.2)
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