Report on topographic surveying

May 2, 2015

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INTRODUCTION

The main purpose of this project is to determine the relief of the Sacred Light Lodge Amorc  premises. This would serve as data for engineering and construction purposes, the model will serve as a tool in guiding the architects and engineers on site. Every position on project site has a specific height value and it can be determined from the model and the various areas can easily be compared. Accurate positioning is not a question anymore because the plan is properly coordinated and georeferenced. !or instance the ", # $ % of any point on the plan can be gotten and can be located on ground and vice versa. &ecause of the %component in the plan, areas of  cut and fill can easily be determined and calculated.

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TERMS OF REFERENCE

The terms of reference for the project entails' •

To carry out a traverse(boundary survey of an area of ).)) *ectares at the project site.

•

To carry out topographical survey at +m by +m intervals within an area of ).)) *ectares at the project site.

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•

To adjust the traverse networ.

•

To produce digital and analogue topographical map at scale of )'+--

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Project Site Location

"RO#ECT SITE

Fig. 1: Location map of the project site at the Sacred Light Lodge Amorc, Amuwo Odofin LGA.

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METHODOLO!

rior to the commencement of the topographic survey, we spent some time planning smooth e/ecution of the project based on the following' 3 |

i.

0econnaissance

ii.

1haining and egging

iii.

Lattice 2esign

iv.

*ardware and Software 0equirement

v.

Test of 3nstrument

vi.

2igital rocessing and lotting

vii.

roject Schedule

viii.

ersonnel

i/.

Transportation

/.

!eeding

/i.

Safety

/ii.

0eport 4riting and Submission

.1

!econnaissance

0econnaissance survey which is also nown as a preliminary survey 5a preliminary inspection of  an area to obtain geographic, hydrographic, or similar data prior to a detailed survey6 was done  before the field wor was carried out. The two forms of preliminary survey carried out were'

•

Office !econnaissance

This involves obtaining necessary information about field observation location that will guide and give idea on what we are to do on the field in order to obtain a ma/imum level of  accuracy. The following tass were carried out. ). reparation of suitable and accurate field boo. 7. Strategi8ing for the actual commencement of the field wor which concluded the office reconnaissance.

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•

Fie"d !econnaissance

This involves preliminary inspection of the area before commencing the field wor, for the  purpose the following. This survey involved visiting the site location and thorough  planning was done on how and where the instruments would be placed to yield best results. These involved' ). Searching for suitable coordinated control. 7. 3ntervisibility between the stations involved. 9. Selection of station which will be used as target. :. Selection of station which will be used as stand point for the Total Station. +. Location of good site which will permit clear observations to be taen after creating arbitrary point on the area to be surveyed. ;. 1haining and pegging the spot height

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#est$Adjustment of %nstruments

After getting the instrument, they were tested on the site of survey. Tests were done on the Total Station to avoid collimation error. The leveling screws of the total station were also noted to be complete so as aid proper stance of the total station on the tripod. All instruments were tested oay and those meant to be adjusted were adjusted properly.

.&

'ontro" (sta)"ishment 

1ontrol surveys establish a common, consistent networ of physical points that are the basis for  controlling the hori8ontal and vertical positions of other surveys including transportation improvement projects and facilities. 1orridor control surveys ensure that adjacent projects have compatible control. roject control surveys provide consistent and accurate hori8ontal and

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vertical control for all subsequent project surveys < photogrammetric, mapping, planning, design, construction, and right of way. The following policies, standards, and procedures are applicable to all control surveys including transportation improvement projects, etc. This includes surveys performed by =overnment survey staff, Survey consultants, Local =overnment Agencies, rivate developers and others.

>erified reference second order controls were used to transfer the ", # and % coordinates to other  controls so that all the controls and positions of spot height can have unified and homogeneous coordinates in both longitude and latitude and ?T@ coordinates. These controls are transferred in phases along the project area. !our numbers of temporary benchmars5T&@s6 were established within the project site for  references. N$ME

%

!

&

T'M1

526025.980

713347.855

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T'M2

526025.581

713366.649

10.44

T'M3

526038.916

713293.758

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T'M(

526010.583

713291.585

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#a)"e 1: 'oordinates of (sta)"ished #emporar* +enchmars

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T'M 2 T'M 1

T'M ( T'M 3

Fig. 1: Location map of the project site showing the esta)"ished #+-s.

.

Lattice /esign

4e carried out lattice design for the spot height. The provisional boundary of the project area was given. This boundary was plotted in Auto1A2 environment. Subsequently, the lattice design was done within Auto1A2 environment by gridding the project area. The gridded lines were  printed and taen to the field to serve as guide during chaining and pegging operations. .0

ardware and Software !euirement 

The hardware and software used for the project were identified during the planning stage. The hardware and the software used for the project are given as follows'

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Ha*+a*- R-/i*-m-nt

The hardware used for the project are'

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i

Fie"d %nstrument  1. 2. 3. (. 5. . ).

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Total Station 5TS-;6. @easuring tape. 0eflector. Tripod Stand. Tribrac  !ield &oo  2ownloader 

.0.2 Software !euirement 

The under listed are the software we used for the project' 1. 1ompaq Laptop 5*22 of 7-=&, 0A@ of ;=&, processor speed of 7.79=*86 and

2. 3. (. 5. . ). . .3

windows  as the Bperating system. =oogle Earth @icrosoft 4ord @icrosoft E/cel Arc=3S )-.7 Software Auto1A2 7-)9 Software Auto1A2 0aster 2esign =olden Surfer )/igita" Processing 

2igital processing of topographic data includes the following sorting of /y8 data, processing of  data in a topographic software that will be compatible with Auto1A2 and Arc=3S )-.7. .4

Project Schedu"e

As contained in our proposal, we ensured that the entire project was e/ecuted and submitted within the speculated time. .12 Processing of #ota" Station /ata

The data files were downloaded from the total station and saved into a ?S& !lash2riveC The total station produces data files in a proprietary 32" and 2"! file format containing !3" 5!3"E26, @EAS 5@EAS?0E26 and plotted data. The 2ata output is in the form of 5D.id/6 te/t file, to e/tract the coordinates of position from the downloaded data, the file is processed by importing to E/cel software, where the unusable data is deleted and the spot height and *ori8ontal coordinates data are retained and saved for further   processing.

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.1 Processing %n Surfer 4

The data saved with e/cel format 5D./sl/6 were imported to the surfer environment and converted to grid format 5D.grd6. S?0!E0 contains a powerful tool that allows quic design of survey contour and 92 surface and display of results. 3ts powerful drawing engine can display bacground files in 2"!, 2=, T3!, files at any rotation and scale. 2esign tools allow quic creation of planned lines. S?0!E0  automatically stores the information to a project directory, allowing set up of new surveys or to quicly switch to an e/isting survey. The Surfer software was used to process the sorted data, drawing of contour lines with a specified contour interval and 92 surface also plotted there.

.15 Processing in ArcG%S and Auto'A/

The ne/t and last stage of processing is to produce the Topographic maps in Auto1ad. The following procedure is usually carried out in creating the 2T@ 3 Arc=3S)-.7' 3ngest the "#% data from @icrosoft E/cel to Arc=3SC this is accomplished by using the Tools  Add "# 2ata option. The projection information 54=SF:6 is as followsC •

4=S )GF: ?T@ %one 9)

•

rojection' Transverse @ercator 

•

!alse Easting' +-----.------

•

!alse orthing' -.------

•

1entral @eridian' 9.------

•

Scale !actor' -.GGG;--

•

Latitude of Brigin' -.------

•

Linear ?nit' @eter 

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!iles are displayed as Event files 5E/cel file6, then e/ported as shapefile. A triangulated irregular  networ 5T36 would be created using the coordinates data point shapefile. Butput projection is typically specified to be the same as the input data. 0aster interpolation of the point data is also  performed using the same input data and T3 was created using the Hcreate T3I option within the 92 E/tension of Arc=3S. This is followed by the creation of the T3 file and the raster file. The 2T@ is then produced by converting the T3 to 92. Auto1A2 was used to plot the traverse(boundary lines using polyline tool and spot height also  plotted in Auto1A2 by running script.  Auto1A2 drawing can be produced by importing the drawing in Arc=3S format into Auto1A2. The Auto1A2 drawing can also be done by transferring the drawing from the Surfer  Environment to the Auto1A2 environment to save time and avoid much editing of drawing from the Arc=3S environment. !or the project area, the Auto1A2 drawing has been provided, so that architects and engineers would be able to wor in a userfriendly environment. The details of survey area also plotted in Auto1A2.

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3.15

D-i-*a4-

Submitted along with this report are the following' ). ) o contour map of the roject Area of scale )' +--. 7. ) o spot height map of the roject Area of scale )' +--. 9.

) o map showing detail and the perimeter of the project area

:.

) o. 1opy of detailed project report.

+.

) o. 2>2 storage device containing information about the project.

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RESULTS

/ surface of the project site

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6ire frame of the project site

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