W1-2-60-1-6
JOMO KENYATTA UNIVERSITY OF AGRICULTURE AND TECHNOLOGY
University Examinations 2016/2017
YEAR III SEMESTER II EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN GIS
EGS 2308: DIGITAL MAPPING
DATE: DECEMBER, 2016 TIME: 2 HOURS
INSTRUCTIONS: Answer Question ONE and Any Other TWO Questions.
Question One – 30 Marks
a) Differentiate between systematic and adhoc data collectors. [4 marks]
b) Explain five advantages of conducting field survey as opposed to aerial chorography as a method of data collection in digital mapping. [6 marks]
c) What steps should be taken to minimize errors while scanning and digitizing? [5 marks]
d) Explain the five purposes of digital mapping. [5 marks]
e) Explain any five sources of discrepancies or errors in spatial data. [5 marks]
f) List and explain the common forms of reliefs depiction. [5 marks]
Question Two – 20 Marks
a) List five sets of data you would use in a mapping exercise for land use planning. Explain the role that each data set will play. [10 marks]
b) You have given several data sets for digital mapping exercise. Explain how you will select suitable data set for your exercise. [10 marks]
Question Three – 20 Marks
a) Discuss the cross slide digitizer. [5 marks]
b) Explain the criteria used in selection of characteristic points in an image. [10 marks]
c) Discuss the errors associated with digitizing maps. [5 marks]
Question Four – 20 Marks
a) Explain the concept of Geo referencing highlighting the three main processes involved. [8 marks]
b) Explain the method via which raster to vectors conversion can be implemented. [6 marks]
c) Give three advantages and disadvantages of raster data models. [6 marks]
Question Five – 20 Marks
a) Explain the aspects that would enable you extract information from an image. [10 marks]
b) Discuss the use of DTMS in a crop suitability and industrial site selection. [5 marks]
c) What is the relevance of meta data? And what does it encompass? [3 marks]
d) Outline two advantages of a TIN as compared to a grid DTM. [2 marks]
