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Geographical Information Systems Question Paper

Geographical Information Systems

Course:Bachelor Of Science In Information Technology

Institution: Kca University question papers

Exam Year:2011

UNIVERSITY EXAMINATIONS: 2010/2011
SECOND YEAR EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE IN INFORMATION TECHNOLOGY
BIT 2307: GEOGRAPHICAL INFORMATION SYSTEMS
DATE: APRIL 2011 TIME: 2 HOURS
INSTRUCTIONS: Answer question ONE and any other TWO questions
QUESTION ONE
a) Distinguish between the following concepts;
i) Satellite image and aerial photo (2 Marks)
ii) Vectorization and rasterization (2 Marks)
b) i) Identify four sources of raster data (4 Marks)
ii) Highlight two strengths of the raster data model (2 Marks)
c) Describe three basic spatial entities as represented using the vector model (6 Marks)
d) i) Define the term ‘plug-in’ and identify any two plug-ins used in QGIS (3Marks)
ii) Maps are a major source of data for GIS. Discuss the process of creating a map (6 Marks)
e) Highlight the major components of the GIS environment (5Marks)
QUESTION TWO
a) Define the following concepts as used in GIS data analysis;
i) Network analysis (2 Marks)
ii) Aspatial query (2 Marks)
iii) Buffering (2 Marks)
b) All GIS data must be presented using three modes or dimensions. Identify these modes (3 Marks)
c) Using your practical knowledge, describe the procedure for accomplishing the following
tasks;
2
i) Changing the projection of a GIS project (3Marks)
ii) Geo-referencing an entity (4Marks)
iii) Digitizing a map (4 Marks)
QUESTION THREE
a) Discuss two approaches to 3D modeling in GIS (4 Marks)
b) Identify any four functions of a GIS application (4 Marks)
c) Describe the logical steps necessary to put a GIS to work using a diagram. (4 Marks)
d) Many GIS applications are in existence today, both commercially and in open source.
List the various types of these applications (2 Marks)
e) Give the meaning of the following terms
i) TIN (2 Marks)
ii) DEM (2 Marks)
iii) UTM (2 Marks)
QUESTION FOUR
a) There are a number of ways that 2D data can be structured in a computer. Among these techniques
are: Topological data structure, Whole polygon structure, point and polygon structure and spaghetti
structure. The figure below shows a representation made up of 3 polygon structures (A, B, and C),
15 linear structures (l1, l2 , l3, .. l15 ) , and nodes (a, b, c ..n).
Describe the above representation using topological data structure. Use detailed tables for your answer.
(10 Marks)
b) i) Define the term ‘spatial referencing’ (2 Marks)
ii) Discuss the problems that can be experienced with spatial referencing systems (8 Marks)
A B
l1 l2
l3
l4
l6 l5
l7
l8 l9
l10
l14
l15
l11
l12
l13
a b c
d
g f e
h
i j
k
l
m n
A
C
3
QUESTION FIVE
a) With examples discuss the main features that characterize topology (6Marks)
b) Discuss the benefits of using a database for GIS attribute data management (3 Marks)
c) The following table shows records of tenants to leased land parcels. Study it and then
attempt the questions that follow;
LEASE
ParcelID Location Owner LeaseStart LeaseEnd Rent
GOV03456 Limuru Kimani Maunde 01/01/2008 01/01/2011 400,200
GOV03457 Limuru Wambui Jeuri 04/05/2009 03/05/2011 200,000
GOV03458 Limuru Samuel Leo 01/11/2009 03/11/2014 150,700
GOV03459 Limuru Phili Masinde 02/10/2010 02/10/2014 630,000
GOV03460 South B Bathelomeo Gumo 05/10/2010 04/10/2011 20,000
Write SQL statements to retrieve the following records;
i) The parcel numbers and owner names of all leased parcels (3Marks)
ii) The records whose lease(s) has expired (2Marks)
iii) All lease information with a rent higher than 200,000 (3Marks)
iv) The parcel numbers, owner names and rent of parcels in Limuru (3Marks)

Geographical Information Systems Question Paper

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