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Geographic Information Systems Question Paper
Geographic Information Systems
Course:Bachelor Of Science In Information Technology
Institution: Kca University question papers
Exam Year:2010
UNIVERSITY EXAMINATIONS: 2010/2011
SECOND YEAR EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE IN INFORMATION TECHNOLOGY
BIT 2307: GEOGRAPHIC INFORMATION SYSTEMS
DATE: DECEMBER 2010 TIME: 2 HOURS
INSTRUCTIONS: Answer question ONE and any other TWO questions
QUESTION ONE (30 MARKS)
a) Explain the meaning of the following geographic concepts;
i) GIS (2Marks)
ii) Attribute data (2Marks)
iii) Remote sensing (2Marks)
iv) Spatial referencing (2Marks)
b) Briefly discuss any three approaches towards the modeling of surface entities (6Marks)
c) Identify three major spatial entities used for representation in GIS (6Marks)
d) Establish the benefits of using a GIS in the place of paper maps (4Marks)
e) Discuss the effectiveness of raster data obtained from satellite images (6Marks)
QUESTION TWO (20 MARKS)
a) Identify reasons why it is necessary to tabulate attribute GIS data (2Marks)
b) Study the three relations PrivatePerson, Parcel and TitleDeed below with three attributes each
and three, four and four tuples respectively, and use it to answer the following questions.
2
PrivatePerson
IdNo Surname BirthDate
101-367 Garcia 10/05/1952
134-788 Chen 26/01/1964
101-490 Fakolo 14/09/1931
Parcel
Pld Location AreaSize
3421 2001 435
8871 1462 550
2109 2323 1040
1515 2003 245
TitleDeed
Plot Owner DeedDate
2109 101-367 18/12/1996
8871 101-490 10/01/1984
1515 134-788 01/01/1984
3421 101-367 25/09/1996
i) Write down the relation schemas for the three tables of the databases (9Marks)
ii) Work out the results of executing the following queries. Include the tables names
- SELECT *
FROM Parcel
WHERE Areasize > 1000 (2Marks)
- SELECT Pld, Location
FROM Parcel (2Marks)
- SELECT *
FROM TitleDeed, Parcel AS ParcelInfo
WHERE TitleDeed.Plot = Parcel.Pld (3Marks)
- SELECT Owner, DeedDate
FROM TitleDeed, Parcel AS LargeParcel
WHERE TITLEDeed.Plot = Parcel.Pld AND AreaSize > 1000 (2Marks)
QUESTION THREE (20 MARKS)
a) Identify the classic network-type problems considered during network analysis (8Marks)
b) The figure below a small 8 x 8 raster with three possible field values: grey shade, checked,
and white.
i) What is run-length encoding? (2Marks)
ii) Construct a quadtree that represents this raster. (10Marks)
3
QUESTION FOUR (20 MARKS)
a) Discuss the technique used by the Transverse Mercator geo-referencing system (8Marks)
b) Identify the advantages of the above system over the geographic referencing system (4Marks)
c) Critically evaluate the important elements that characterize topographic map data (8Marks)
QUESTION FIVE (20 MARKS)
As a GIS consultant, you have been contacted by the Ministry of Health to help them establish
a mobile GIS unit whose primary purpose will be to manage and contain any outbreak of
infectious diseases in the country.
a) Discuss how GIS can be used in infectious disease management and control (10Marks)
b) Explain the criteria you will recommend to the Ministry of Health as regards the acquisition of
GIS technology for infectious disease management and control. (10Marks)
Hint: Recall this is a mobile unit. Disease outbreaks do occur at times in very remote places.
Technology should thus also consider mobility and information distribution
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