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Nigeria's free digital learning hub. Videos, lecture notes, practice questions and leaderboards aligned with CCMAS, NBTE, NCCE, WAEC, NECO, IJMB and JAMB curricula.
Environmental Health Science · 200 Level
This is the complete lecture note for URP 206 Introduction to Remote Sensing, prepared for Environmental Health Science students at 200 Level. You can read it online below, open it in the full viewer, or download the PDF for offline study. It pairs with the course's video lectures, so you can read and watch together.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Course code: URP 206 Course title: Introduction to Remote Sensing COURSE UNIT : 2 Units Series 1: Concept and Historical Evolution of Remote Sensing Series 2: Physical Basis of Remote Sensing and Electromagnetic Radiation Series 3: Remote Sensing Platforms and Sensor Technology Series 4: Principles and Elements of Image and Photo Interpretation Series 5: Digital Image Analysis, Applications, and Case Studies in Remote Sensing Here is the proposed outline for Series 1: Part 1 Concept of remote sensing • Definition of remote sensing • Key features of remote sensing • Importance and applications of remote sensing Part 2 Elements of a remote sensing system • Components of a remote sensing system (energy source, atmosphere, interaction with target, sensor, data transmission, interpretation) • Techniques of remote sensing • Overview of remote sensing technology Part 3 Historical evolution of remote sensing • Early developments (balloons, kites, aerial photography) • Modern history (satellite remote sensing, digital imaging) • Milestones in remote sensing development Part 4 Remote sensing in planning and research • Role of remote sensing in planning • Case studies in planning and environmental management • Integration with GIS in research Introduction Remote sensing has become one of the most powerful tools for observing and understanding our world. From monitoring agricultural fields to mapping urban growth, it allows us to obtain information about objects and areas without direct contact. To appreciate its current
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS applications, it is important to first understand the concept of remote sensing and how it has evolved over time. This Series sets the foundation for the course by introducing the basic ideas and tracing the historical journey of remote sensing from its earliest beginnings to modern satellite technology. The aim of this Series is to familiarise you with the concept of remote sensing, highlight the essential elements of a remote sensing system, and provide an overview of its historical development and relevance to planning and research. We shall commence this Series by examining the concept of remote sensing, including its definition, key features, and importance. Next, we will move on to the elements of a remote sensing system, considering its components and techniques. Following that, we will explore the historical evolution of remote sensing, beginning with early developments such as aerial photography and progressing to modern satellite-based systems. Finally, we will wrap up by discussing the role of remote sensing in planning and research, supported by case studies and its integration with GIS. This progression will ensure that you gain a clear understanding of both the foundations and the historical context of remote sensing. Series Learning Outcomes Upon completing this Series, you should be able to: • SLO 1.1 define the concept of remote sensing, • SLO 1.2 explain the key features that characterise remote sensing, • SLO 1.3 analyse the importance and applications of remote sensing in planning and research, • SLO 1.4 describe the main components of a remote sensing system, • SLO 1.5 explain the techniques used in remote sensing, • SLO 1.6 outline the early developments in the historical evolution of remote sensing, • SLO 1.7 discuss the milestones in the modern history of remote sensing, and • SLO 1.8 evaluate the role of remote sensing in planning and research, including its integration with GIS. 1.1 Concept of Remote Sensing Remote sensing is the foundation of this course. Remote sensing is defined as the science and art of obtaining information about objects or areas from a distance, typically using sensors mounted on platforms such as aircraft or satellites, without direct contact with the object. It allows us to study the Earth’s surface and atmosphere efficiently and is widely applied in environmental monitoring, urban planning, agriculture, and disaster management. Fill in the blank: Remote sensing is the science and art of obtaining information about objects or areas from a __________. 1.1.1 Definition of remote sensing
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS The definition of remote sensing highlights two important aspects: it is both a science and an art. As a science, it involves the use of physical principles such as electromagnetic radiation. As an art, it requires skill in interpreting images and data. Remote sensing enables us to collect data across large areas quickly, which would be difficult or impossible to achieve through direct field observation. Fill in the blank: Remote sensing is both a __________ and an art. Key Aspect Core Principle Scientific Method The science and art of obtaining information about an object, area, or phenomenon. Observation Platform Uses sensors mounted on platforms such as aircraft, drones (UAVs), or satellites. Distance & Contact Information is gathered from a distance; it does not involve direct physical contact with the object being studied. Box 1.1: Definition of remote sensing • Science and art of obtaining information from a distance • Uses sensors mounted on platforms such as aircraft or satellites • Does not involve direct contact with the object 1.1.2 Key features of remote sensing Key features of remote sensing include: • Non-contact data collection: Information is obtained without physical contact with the object. • Use of electromagnetic radiation (EMR): Remote sensing relies on the interaction of EMR with the Earth’s surface. • Wide coverage: Large areas can be studied simultaneously. • Repetitive coverage: Remote sensing allows monitoring of changes over time. • Multidisciplinary applications: It is used in geography, environmental science, agriculture, and engineering.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Fill in the blank: Remote sensing relies on the interaction of __________ with the Earth’s surface. Feature Description Example Application Non-contact Collection Sensors capture data from a distance, removing the need for physical presence. Monitoring high-risk or inaccessible areas like volcanic craters or dense swamps. Use of EMR Relies on the interaction of Electromagnetic Radiation with the Earth's surface. Differentiating between healthy vegetation and paved surfaces using infrared sensors. Wide Coverage A single image can cover hundreds of square kilometers. Creating regional land-use maps for an entire state like Kwara or Lagos. Repetitive Coverage Satellites orbit the Earth regularly, capturing the same spot at fixed intervals. Monitoring the rate of deforestation or the seasonal flooding of the River Niger. Multidisciplinary Data is versatile and can be used by scientists across various industries. Predicting crop yields in agriculture while simultaneously planning urban expansion. Table 1.1: Key features of remote sensing 1.1.3 Importance and applications of remote sensing The importance of remote sensing lies in its ability to provide timely, accurate, and cost-effective information. It is applied in:
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS • Environmental monitoring: Tracking deforestation, desertification, and climate change. • Urban planning: Mapping land use and guiding infrastructure development. • Agriculture: Assessing crop health and estimating yields. • Disaster management: Monitoring floods, earthquakes, and wildfires. Fill in the blank: Remote sensing is important because it provides timely, accurate, and __________ information. Diagram showing applications of remote sensing in agriculture, urban planning, and environmental monitoring. Figure 1.1: Applications of remote sensing
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Pilot questions 1.1 1. Define remote sensing. 2. State two key features of remote sensing. 3. Which type of radiation does remote sensing rely on? 4. Mention two applications of remote sensing. 5. Why is remote sensing considered both a science and an art? 1.2 Elements of a Remote Sensing System A remote sensing system is made up of several interconnected components that work together to collect, transmit, and interpret information about the Earth’s surface. Remote sensing system refers to the complete arrangement of energy sources, sensors, transmission channels, and interpretation processes that enable the acquisition of data from a distance. Understanding these elements is crucial because they form the backbone of how remote sensing operates in practice. Fill in the blank: A remote sensing system is the complete arrangement of energy sources, sensors, transmission channels, and __________ processes. 1.2.1 Components of a remote sensing system The main components of a remote sensing system include: • Energy source: Provides electromagnetic radiation (EMR) that interacts with the Earth’s surface. • Atmosphere: Acts as a medium through which EMR travels, sometimes absorbing or scattering radiation. • Interaction with the target: The Earth’s surface reflects, absorbs, or emits radiation depending on its properties. • Sensor: A device that detects and records the radiation from the target. • Data transmission and reception: Channels that transfer recorded data to ground stations. • Interpretation and analysis: Processes that convert raw data into meaningful information. Fill in the blank: The __________ is the device that detects and records radiation from the target.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Diagram showing the flow of energy from source to sensor in a remote sensing system. Figure 1.2: Components of a
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