PRODUCTION OF A DIGITAL TOPOGRAPHICAL PLAN OF THE METHODIST HIGH SCHOOL, OWO, ONDO STATE


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PRODUCTION OF A DIGITAL TOPOGRAPHICAL PLAN OF THE METHODIST HIGH SCHOOL, OWO, ONDO STATE  

ABSTRACT

This project was aimed at producing a digital topographical plan of the Methodist High School, Owo in Ondo State. The first chapter of the project covers the introductory aspects. Literature review was discussed in chapter two, and chapter three talked about the methodology.

Hence, reconnaissance surveys both field and office were carried out in order to be familiar with the nature of the terrain and the requisition and assembling together of viable information from both primary and secondary sources of data respectively. The spatial data were acquired through the use of total station. The processes of traversing, leveling, spot heighting and detailing were simultaneous carried out with the use of the digital equipment (i.e total station), in the determination of the spatial coordinates (Northings, Eastings and Heights) of the boundary stations proposed for future developments (spot heighting). In the database design, creation and management stage, Arcview GIS 3.2A was used to design the spatial database.

Spatial analysis and presentation were discussed in chapter four. The topographical plan of the area of study was produced in soft copy at a scale of 1,5000. The interpretation of this plan support decision making policy needed by Environmental-oriented professionals (such as

Estate Surveyors, Engineers, urban and regional planners, Architects and even land surveyors) to plan, design and execute vital infrastructural projects. Conclusively, chapter five contained the summary, conclusions and recommendations.

CHAPTER ONE

1.0 INTRODUCTION

1.1 BACKGROUND OF STUDY

Topographical

survey constitute of a very important tool, enabling the platform upon which the design, and implementation of most physical and infrastructural development on the surface of the earth were based.

The production of topographical plans as a type of geographical document is characterized by small or large scaled detailed and qualitative representation of relief using contour line. Hence both man-made and natural feature can be properly and adequately depicted in a topographical plan.

The increased advancement in digital surveying technology based on the use of modern sophisticated computers and digital survey  equipments and the  availability of new tools had transformed topographical map production from the traditional and conventional techniques into digital techniques. Currently, the availability of fast computer and digital data acquisition technology and digital data processing along with information presentation technology have brought a revolution into map making through the GIS application. And these make decision making easy and faster.

The invent of GIS database (which is flexible and versatile) is necessary to meet the need of the fast growing economic situation that demand more effective and efficient decision making in land use and general urban planning system. Hence in achieving such an accurate and versatile database of any information system, its design (model) and implementation must be handled with proper care and high integrity, in order to provide the user with refined, accurate and adequate information. Queries can be formulated by the users such as queries of the information system that answers to his or her questions, provided by the information has to be presented to him or her either graphically or in alpha numeric format.

Topographic survey technique systematically and analytically provide coordinate values of relevant features such as buildings, roads electric poles, bore holes in horizontal and vertical dimension including points on the ground surface in addition to spot heights value of the area from which contours are drawn. Structuring the data which are obtained by surveying technique and finally by using high speed digital electronic computer with appropriate programme (software) to design and create database for relevant features and to interpolate elevation at any place. Therefore information generated and analysed could be used for various designs of engineering project and environmental based applications such as roads, drainages, bridges, large structures and structural buildings.

The major sources of data for topographic information system include the following:

1)   Field surveying method using GPS, total station

2)   Manual digitizing using digitizer

3)   Scanning by using scanners

4)   Aerial images

5)   Satellite  images

This project deals with the production of digital topographic plan of Methodist High School, Owo in Ondo State. The data were acquired with the use of total station. Also, with the use of automated hardware and software, the data could then be further processed.

1.2 STATEMENT OF PROBLEM

Environmental development is on an increase rate, where by new structures are erected on daily basis and changes are caused to the physical earth surface which need rapid and regular updating of various developmental projects within the environment.

The use of analogue equipment has always been a problem especially in the human stress and updating of different changes cause to the environs. It is difficult to accurately and timely update

topographic map with the use of the old analogue survey instrument.

The introduction of sophisticated computers, modern technology and methods for digital topographic map production, had really help to overcome the prevailing problems, associated with analogue method of topographic plan production. Information got from the previous analogue method of plan production had effect on planning and construction of necessary amenities such as roads pipeline, construction, buildings, electricity and water network system needed in the institution for easy planning and further development. But with the new modern digital equipment digital production of topographic plan of Methodist High School, Owo in Ondo State could be achieved and used for effective decision making policy.

Morealso, to achieve an orderly and sustainable development, the creation of a viable spatial database including its associated graphic information for the project site is also very needed.

1.3 AIM AND OBJECTIVES 1.3.1 Aim

The aim of the project is to produce a digital topographic map of Methodist High School, Owo in Ondo State with the application of digital survey equipments including geographic information system (GIS) techniques. Hence, with this new techniques the cost of updating, manipulating and analyzing spatial geographic information could be reduced to a minimum level.

1.3.2 Objectives

In achieving the above state aim, the following objectives below includes:

1)   Spatial and attribute data of Methodist High School, Owo were acquired

2)   The processing of the data using Surfer 8 and CAD software.

3)   Spatial queries and analysis were also adequately performed using Arc view

4)   Adequate presentation of information and data management using Arc view software

1.4 SIGNIFICANCE OF THE STUDY

The production of digital topographic plan will enhance adequate, timely and easy access to topographic information and accurate update of the topographic plan. This will ensure currency of topographic information for diverse infrastructural development within the environment.

With the aid of the available sophisticated hardware and software, digital terrain model that can be used to view the features could be created. Within the project area, terrain analysis and generation of a variety of products with its software can be performed effectively.

1.5 SCOPE OF THE PROJECT

The scope of the project consists in:

1)   Data acquisition: The geometric (spatial) and attribute data were captured through the use of total station, including oral interviews and renew of manuals further attribute data

collection

2)   Data processing: This involves the conversion of the acquired data from the field into different functions using appropriate software. In this project the X, Y, Z coordinates of station points were obtained, store downloaded in the computer system and processed in order to achieve the desirable result. The application of database management system was also very vital for proper query and analysis of the spatial data

3)   Analysis and Information presentation: The final result obtained from the processed data were presented both in the soft copy and hard copy format. Auto card 2002 and Arc view softwares were used extensively for the digital map production comprising the graphic information and the

attribute data.

1.6 PERSONNEL

The following personnel were involved in the execution of the project with their various levels of participation.

1) Emiju Dele       -

          Author

2) Henry Bassey    

-      Survey Assistant

3) Victor Okoro      

-      Survey Assistant

4) Tuned Olumide 

-      Target man

5) Mike Ogunde     

-      Labour

6) Andrew Femi     

-      Labour

7) Gbenga Peter     

-      Labour

1.7 STUDY AREA

The study for the project was Methodist High School, Owo at Owo Local Government Area of Ondo State, Nigeria. The geographical location of the site was between latitude () with longitude (). It covers approximately 15.540 hectares of land.

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PRODUCTION OF A DIGITAL TOPOGRAPHICAL PLAN OF THE METHODIST HIGH SCHOOL, OWO, ONDO STATE


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