REMOTE SENSING
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This document provides an assignment for students in an Introduction to Remote Sensing course. It includes 5 practical groups, each with tasks related to different aspects of active remote sensing. The tasks cover topics like the advantages of satellite vs aircraft sensors, synthetic aperture radar, lidar technologies, and applications of remote sensing like mapping forest types and supporting groundwater studies. Students are divided into groups and asked to research their assigned topics, taking notes and preparing a group report to submit by the specified deadline. The examination for the course may include questions from this assignment.
REMOTE SENSING
- 1. SOKOINE UNIVERSITY OF AGRICULTURE COLLEGE OF AGRICULTURE DEPARTMENT OF ENGINEERING SCIENCES AND TECHNOLOGY REMOTE SENSING AND GIS LABORATORY Course LRM 111: Introduction to Remote Sensing Assignment-3 (Case Study-3) 1st SEMESTER B.Sc. Irrigation and Water Resources Engineering (B.Sc. IWRE) Instructor(s): Prof. D.N. Kimaro Dr. Proches Hieronimo Date: 13 December 2016 Remote sensing is the science and art of obtaining information about an object, area, or phenomenon through the analysis of data acquired by a device that is not in contact with the object, area, or phenomenon under investigation. Remote sensing which measure energy that is naturally available are called passive sensors. Passive sensors can only be used to detect energy when the naturally occurring energy is available. Active sensors, on the other hand, provide their own energy source for illumination. The purpose of this assignment is to study and write notes on Active remote sensing. For each practical group write notes on the tasks given in the Table below: Practical Group No Task 1 i. What advantages do sensors carried on board satellites have over those carried on aircraft? Are there any disadvantages that you can think of? ii. As a satellite in a near-polar sun-synchronous orbit revolves around the Earth, the satellite crosses the equator at approximately the same local sun time every day. Because of the orbital velocity, all other points on the globe are passed either slightly before or after this time. For a sensor in the visible portion of the spectrum, what would be the advantages and disadvantages of crossing times (local sun time) (a) in the early morning, (b) around noon, and (c) in the mid afternoon? iii. If you wanted to map the deciduous and the coniferous trees in a forest using remote sensing data, what would be the best way to go about this and why? Use the reflectance curves illustrating the spectral response patterns of these two categories to help explain your answer iv. What would be the advantage of displaying various wavelength ranges, or channels, in combination as colour images as opposed to examining each of the images individually? 1
- 2. 2 i. What is RADAR ii. Principles of imaging radar iii. What does a radar system measure? iv. Geometric properties of radar v. What is Synthetic Aperture Radar vi. Application of radar vii. What are the limitations of radar images in terms of visual interpretation 3 The difference between active and passive remote sensing systems in terms of (a). Energy sources (b). Regions of spectrum in which they operate (c). Wavelength (d). Reliance on solar irradiance (c). Providing examples of each system 4 i. The similarities and differences between RADAR and LIDAR technologies ii. What is Laser scanning iii. The application of LIDAR technology in Geomorphology and Forestry iv. The application of LIDAR technology in Agriculture and Geology 5 Write notes on the application of Remote sensing in support of groundwater studies Prepare a Group assignment/Case Study report. Submit your Group report (hard and soft copy) by 16 January 2016 before 12:30 pm. Submit your soft copy by e-mail. Note that the all group reports should be shared among all students just after the group report is submitted. Expect questions in the semester examination from this assignment. 2