DETAILS SURVEYING

DEFINITION OF DETAIL


Detail survey is actually to get the position and height of points on the earth surface. Besides, it can describe the actual features either natural or man-made available on a surveyed area onto a map or plan. Details surveying and tachometry are both shared the same principle. Data that is collected in details survey are produced in three dimensional (x, y, and z). This survey is doing to get the vertical and horizontal controls. x and y value are gathered from the controlled traverse which is established in the beginning of survey work. Before pick up any detail surveying field work, firstly is to prepare a set of specifications which set out the aims of the survey, the accuracy required, the amount and type of detail that is to be located and the intensity of any spot levels that are to be taken. Details surveying prepared involves considering the purpose of the survey, its accuracy requirements and its end product and choosing suitable equipment, techniques and drawing media that will ensure that the specifications are achieved.

Detail normally picked up from the control network (traverse) by total station with internal memory. Specific codes used to represent the details for ease. On maps and plans symbols can be used to represent detail. There is no universally agreed range of symbols for use in map and plan production. Booking for detail survey is still required though the readings have been recorded in the total station memory for checking purpose.

There are four categories of detail:

: Hard Details – the constructed features such as road, buildings and drainage
system.

: Soft Details – the natural features such as river banks, tree and
Vegetation.

: Overhead Details – the features that located on the ground such as electric
power lines and telephone lines.

: Underground Details – the features that located below of the ground such
as water pipes and sewer runs.



In this hydrographic surveying project, detail survey performed on the land where horizontal and vertical control points located. This uses to describe the location of those points from the natural or man-made features available there.Detail can be survey or pickup using total stations. There are information detail must be survey:

Ä Planimetric Information such as Permanent building / structure; Visible boundary feature like walls, fences or hedge; Road, track; Railways feature with arranged access; Water feature; Earth works or other relevant point. The accuracy of planimetric detail shall be such that the plan position of any well define point of detail shall be correct at the plan scale when checked from the nearest permanent control station.



: Height Information shall be provide a spot height throughout the survey area,
Contours and Obstructed ground.

: Detail Symbol are actually to guide drafting man to plot the drawing such as :

: BO : building,
: JO : road,
: OF : fence,
: P : spot level,
: MH : manhole etc.