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Geoidal heights or undulations and deflections of the vertical are essential for accurate relative or absolute position computations in all geodetic work. They are required to enable measurements made on the surface of the earth to be reduced to the reference ellipsoid.
The efforts by SIWES are to bridge the gaps existing between theory and practice of engineering (surveying), technology, sciences - medical, agricultural, management and other professional programmes in Nigerian tertiary institutions.
The students industrial work experience scheme (SIWES) is the accepted skills and technical training programme which forms part of the approved minimum academic standards in the various degrees programme for all Nigerian universities.
The Students Industrial Work Experience Scheme (SIWES) is the accepted technical training programme which forms part of the approved minimum academic standards in the various degree programmers of Nigerian universities.
The writing of this report was motivated by my experience during my IT attachment at the Ministry of Lands, Survey and Urban Development Owerri. This report is meant to be a guideline to every student.
The accuracy of distances measured by an elecro-optical distance measuring equipment is affeted by the metecrologica condition of the environment.
The students industrial work experience scheme (SIWES) is the accepted technical training programme which forms part of the approved minimum academic standard in the various degree programmes for all Nigerian universities.
This technical report shows the students experience on some cadastral surveys during the period of the training. Such experience includes production of new survey plans/maps for clients.
A final adjustment of the Nigerian triangulation network is not yet done. Various approaches which include Helmert blocking, phase and sequential adjustments have been proposed for the final adjustment, and the entire process is expected to be computerized.
The students industrial work experience scheme (SIWES) is a
compulsory exercise which provides the opportunity for practical
learning of the sundry theories in surveying and geo-informatics and
other professional disciplines.
This report is written based on the six months SIWES training
carried out at the office of the surveyor- General of the Federation. The
office is located at No. 8,Yawuri street Garki, Abuja.
The Nigerian fundamental triangulation network is made up
of triangulation stations connected by chains of geodetic
triangles whose angles have been observed.In the past a chain
or a par': of it was adjusted by semi-rigorous methods
with the result that it is not possible to carry out
statistical analysis and inference on the quality of the
Nigerian network,neither in part,nor as a whole-One such chain
is the R-chain network in the North Western part of Nigeria.
The aim of this work is to undertake a rigorous
adjustment of the R-chain or parts of it using the principles
of least squares. Statistical information resulting from this
will be used to assess the quality of the chain,and if found
good will also provide statistical information to be used for
this chain when the entire Nigerian network is adjusted by the
At times it becomes necessary to use non-
conventional instruments or devices for measurements,
especially when the conventional ones are either not
available or very expensive. In this research the
capability of the Zeiss C-8 coordinatograph as a photo
coordinate measuring instrument has been investigated.
Image coordinates of a number of selected test points
were measured on the instrument. They were refined * and used to derive their equivalent ground coordinates.
These photogrammetrically derived coordinates were
compared with the ground survey values of the test
points and discrepancies were generated. Statistical
evaluation of results show that the procedure and
principles presented can be used for providing control
for mapping at medium and small scales, mosaic
construction, and remnnaissance surveys.
This research's execution is aimed at realising a more suitable method for longitude determination in low latitude areas like Nigeria. This has been done by comparing the Tsinger's method with a modified version of Mayer's method with a view to ascertaining which of the two can be more advantageously adopted for use in Nigeria.
GIS maps the exact location and survey coordinates of an object in space to provide answer to queries using a computer system. For the purpose of this research work, GIS was used to develop a detailed mapping where the facilities of Enugu Electricity Distribution Company (EEDC) located at Uwani in Enugu South LGA, of Enugu was spatially represented with their attributes. This will help in fast and easier retrieval of information for instantaneous use in the area of planning, monitoring and management of their facilities. The research work is aimed at using hand-held Global positioning system (GPS) to obtain the geographic coordinates of the facilities and other detailed information which will be used to build the attribute. The image of the study area was downloaded from Google Earth, added into Arc Map 10.1 and spatially georeferenced (UTM 32N, WGS 1984). Shapefiles for representing streets major road, electric poles, transformers e.t.c were created using the Arcatalogue of Arc GIS 10.1. Series of spatial search/query operation was carried out on the electric poles, feeders and transformers to provide answers to the pending questions that will lead to effective management of the facilities. The end products are the street guide map of Uwani, Uwani Electricity Distribution Maps, attributes tables of the facilities of EEDC, soft copy of Uwani power distribution maps.
The dedicated satellite gravity missions have provided homogeneous and uniformly accurate information on the long and medium wavelengths of the Earth’s gravity field. The aim of this study is to evaluate the comparative fit of EGM2008, GRACE and GOCE geoid models over Nigeria and to assess the possible improvements to them coming from the recently obtained satellite gravity models. The study is conducted in stages. First, the geoid models computed from the first and the second generation GOCE-only and GRACE-GOCE combined satellite-only models as well as EGM08 are truncated for different spherical harmonic degrees are compared to the Orthometric heights of some points in the Nigerian triangulation network which are reduced to the same spectral band of the gravity field. The Orthometric -derived geoid heights are used as independent controls in the assessment of the geoid models. The comparison results indicate that the GRACE models show a full power of gravity signal in terms of geoid undulation up to about spherical harmonic degree 150. Second, one of the first generation GOCE satellite-only models developed by the time-wise approach, TW01, is complemented with local terrestrial data and tested against the Orthometric height-derived geoid undulations in full spectrum of the gravity field and compared with the official global and regional geoid models does not yield good results. Based on total results there is enough evidence indicating significant improvement (cm level) from the GRACE models to the geoid modeling in Nigeria with 0.892rms and 0.147m or 14.7cm standard deviation over EGM08 and GOCE.