Surveying BEC102 6 - Tacheometry, Detailing, Topo Survey

8/13/2019 Surveying BEC102 6 - Tacheometry, Detailing, Topo Survey

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Tachymetry SurveyDetailing SurveyTopographical Survey

Sr SITI NUR ALIAA ROSLANKLIUC


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Planimetric and TopographicMapping

Basic Types of Maps:

Planimetric Maps

Hypsometric Maps

Topographic Maps

Cartography:- The art and science of representing spatial

position of real world objects (3-D) on a 2-D plane by means

of points, lines and symbols.


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Planimetric Maps Show only the horizontal position of geographic and culturalfeatures

Do not show topographic features Show accurate horizontal distances Plan view


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Hypsometric Maps Show landscape relief Use Contours,

Shading, Hachures, 3-D Grids


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MINI QUIZ:

Match the numbers to

the letters


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Topographic Maps Contain elements from both Planimetric and Hypsometric

maps


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Methods of Topographic Mapping Aerial Photogrammetric Methods -Large Areas, Small scale


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Satellite Imagery- Large Areas, Small scale


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Ground methods- Small Areas, Large scale

Conventional Ground Methods Total Station


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GPS Methods


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Hydrographic Mapping


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Specific Types of Maps:

- World Maps - Highway/Road Maps - Land-Use Maps

- Natural Resource Maps - Navigational Charts

- Property Maps - Census Maps - Maps for the Blind (tactile)...


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Time Zones


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ROAD MAP


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Contours from Grid Elevations

94.1 98.297.0

92.1 96.8

93.6 95.191.7

94.7 95

96

9798

94

95

92

93

9392


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Introduction Tachymetry survey obtains the position and height of the points.

The purpose is to produce the details plan.

There are two different method:-

The Stadia System

The Electronic System (Normally using Total Station nowadays) The tachymetry equipments:-

Theodolite (Optic or digital)

Staff

Survey tape

Tripod

Tachymetry Survey


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Tachymetry Survey Instruments


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Reading have been recorded:-

Zenith/Vertical angle

Stadia reading: Up, Intermediate and Down.

Height of the instrument.

Horizontal angle (bearing)

Tachymetry Survey The Stadia System

A

S

Vh

X

Y

i

I

B

D

H

telescope


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H = 100 S Cos2

V = (100 S Sin 2)

ALB = ALA + i V m

V =Zenith distance = vertical angle

H = Horizontal distance.

i = Instrument height.

S = Up reading Stadia minus down reading Stadia.

m = Intermediate reading Stadia.ALA = Level value of point A

ALB = Level value of point B


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Example:-

Staff position 1 has been observed from A with = 300, s= 0.75m and mid reading is 1.41m. Thus, what is thereduced level of position 1? Given, the height of Point A is27.38m.

H = (100 x 0.75) cos2 3 = 74.8m

V = (100 x 0.75) sin 6/2 = 3.92m

Reduced Level Position 1 = 27.38 + 3.92 1.41 = 29.89m


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The Electronic System Survey Equipments:-

Total Station / Theodolite & EDM

Prism and Pole

Tape

Tripod The needed reading:-

Horizontal angle (bearing)

Horizontal distance

Instrument height of survey instruments: Total Station and Pole.

Tachymetry Survey

H

D

VT

i

A

B

The Electronic System


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V = H Tan

ALB = ALA + i V T

V =zenith distance.

D = slope distance

H = horizontal distance.

i = Total Station height

T = The height of pole with the prism.

The Electronic System


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Tachymetry Survey

Measure the height of total station. Pole with the small prism


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Output Processing from Tachymetry Survey

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Surveying BEC102 6 - Tacheometry, Detailing, Topo Survey

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