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Ass 301: Gis And Remote Sensing Application In Agriculture Question Paper

Ass 301: Gis And Remote Sensing Application In Agriculture

Course:Bachelor Of Science In Agriculture

Institution: South Eastern Kenya University question papers

Exam Year:2014

SOUTH EASTERN KENYA UNIVERSITY
UNIVERSITY EXAMINATIONS 2014/2015
THIRD YEAR FIRST SEMESTER EXAMINATION FOR THE
BACHELOR OF SCIENCE (AGRICULTURE) AND
BACHELOR OF SCIENCE (RANGE MANAGEMENT)

ASS 301: GIS AND REMOTE SENSING APPLICATION
IN AGRICULTURE

DATE: 23RD APRIL 2015 TIME: 2 HOURS

Instructions:
Answer question ONE and any other TWO questions. Illustrate your answers by means of
carefully drawn sketches or diagrams

Question One:
Remote Sensing section
a) There are two types of remote sensors; passive and active. Describe their differences in
remote sensing and give one example of a system in each type
2 Marks
b) Describe four different types of resolutions that are important in remote sensing
2 Marks
c) What is the meaning of panchromatic imagery?
2 Marks
d) Describe two most appropriate applications of each of the following sensors in
agricultural mapping activities
i) Radar
ii) Landsat
4 Marks
GIS Section
e) Describe three basic characteristics of geographic information
3 Marks
f) Explain meaning and importance of an orthographic photo?

2 Marks
g) Giving examples, describe four different data types that are useful in representing an
object or a phenomenon in GIS. Give one example in each of the data types
6 Marks
h) Describe the importance of the information required in each of the following procedures
in GIS application
i) Crop suitability mapping
ii) Soil fertility mapping
5 Marks
i) Describe the concept of vector models and raster models and explain how each of these
models are applied to represent geographic data. Give at least two examples of vector data
and two examples of raster data.
4 Marks
Question Two
a) Describe five advantages of using remote sensing techniques over the traditional
surveying methods in monitoring the health of crops
10 Marks
b) Describe five attributes that can be observed using remote sensing techniques
indetermining the health conditions of a crop
10 Marks
Question Three
a) Using the remote sensing techniques, we can map and monitor crop types and acreage
of a farm. Describe some of the most important imagery resolutions that would
influence the observations in this case
8 Marks
b) Compare and contrast the application of satellite and ground based platforms of
remote sensing
12 Marks
Question Four
a) Use a diagram to describe the path, components and processes involved in transmitting
the Electromagnetic radiations (EMR) through the atmosphere if using the Sun as the
energy source for satellite-based remote sensing.
8 Marks
b) Wavelength is the key parameter used on the electro-magnetic spectrum to differentiate
between spectral signatures in remote sensing. Sketch a graph to show how you would
differentiate between dry soil, vegetation and water based on their level of reflectance
8 Marks
c) What is NDVI and what information can it show?
4 Marks

Ass 301: Gis And Remote Sensing Application In Agriculture Question Paper

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