Vineesh V, Geography

1. Geometric Fundamentals of Photogrammetry The geometric fundamentals of photogrammetry explain how 3D ground features are represented as 2D images using the principles of perspective geometry. Perspective projection – Formation of an image from a single camera position. Camera station (Exposure station) – Position of the camera during exposure. Principal point – Centre of the photograph. Principal axis – Line joining the camera lens and principal point. Focal length (f) – Distance between the camera lens and image plane. Scale – Ratio of image distance to ground distance. Concept: Photogrammetry uses camera geometry to measure distances, heights, and coordinates accurately. 2. Elements of Vertical Photograph A vertical photograph is taken with the camera axis nearly perpendicular (90°) to the Earth's surface. Key Elements Principal point (PP) Nadir point (NP) Isocentre (IC) Fiducial mar...

1. Elements of Image Interpretation Image interpretation is the process of identifying and analyzing objects or features in aerial photographs or satellite images using their visual characteristics. Key Elements : Tone/Colour: Brightness or colour of an object. Texture: Smoothness or roughness of a surface. Shape: Geometric form of an object. Size: Dimensions of the object. Pattern: Spatial arrangement or repetition of features. Shadow: Helps determine the height and shape of objects. Site: Physical location or topographic position. Association: Relationship with nearby features. 2. Collateral Information Definition: Collateral information is the supporting information used along with photographs or satellite images to improve interpretation accuracy. Examples : Topographic maps GIS data Field survey (Ground truth) Historical records Climatic and geological data GPS observations ...

  Infectious diseases are diseases caused by microorganisms (bacteria, viruses, fungi, parasites) that can spread from one person, animal, or environment to another. How Diseases Spread (Transmission) Direct contact – Touching an infected person. Airborne – Through coughing or sneezing. Water and food – Drinking or eating contaminated food or water. Vector-borne – Spread by mosquitoes, ticks, or flies. Blood and body fluids – Through infected blood or body fluids. Creation (Occurrence) of Infectious Disease Disease occurs when: A pathogen enters the body. The person's immunity is weak. The environment is favorable (poor sanitation, pollution, overcrowding). Important Scholars Scholar Year Contribution Louis Pasteur 1861 Proposed the Germ Theory of Disease . Robert Koch 1882 Iden...

1. Disease Mapping GIS maps the location of diseases. Helps identify areas with high disease cases. Scholar: John Snow (1854) – Created the famous cholera map in London, considered the foundation of medical mapping. 2. Health Risk Mapping Identifies areas with high health risks (pollution, floods, poor sanitation). Helps governments plan preventive measures. Scholar: Charles Picket (1990s) – Promoted GIS applications in public health planning. (Often cited in health GIS literature; ensure the spelling is "Picket/Picquet" according to your syllabus source.) 3. Hotspot Analysis Finds places with many disease cases . Used to identify disease outbreak areas. Method: Getis-Ord Gi* Statistic. Developed by: Arthur Getis & J. Keith Ord (1992). 4. Coldspot Analysis Finds places with very few disease cases . Helps compare healthy and unhealthy regions. Method: Getis-Ord Gi* (1992...

Geography is the scientific study of the Earth , its physical features , human activities , and the relationships between people and the environment . It answers four basic questions: What is found? Where is it located? Why is it there? How does it interact with other places? Why is Geography Called a Science? Geography is a science because it: Observes natural and human phenomena. Collects and analyzes data. Uses scientific methods. Explains spatial patterns and relationships. Uses modern tools such as GIS , Remote Sensing , GPS , and Artificial Intelligence (AI) . Place of Geography in the Classification of Sciences Geography is unique because it belongs to more than one branch of science . Branch of Science Role of Geography Natural Science Studies landforms, climate, soils, water, vegetation, and ecosystems. ...

Chronological sequence and categorized by era and region. I. Introduction & Etymology •  Etymology : The term "Geography" derives from the Greek γεωγραφία (geographia) , meaning "Earth-writing" (description or writing about the Earth). •  First Use : Eratosthenes (276–194 BC) was the first person to use the word. •  Pre-Term Practices : Recognizable geographic practices like cartography (map-making) existed prior to the coining of the term. II. Antiquity & Ancient Civilizations 1. Ancient Egypt (Pre-Classical) •  Cosmology : Ancient Egyptians viewed the Nile as the center of the world, with existence based upon "the" river. •  Geographical Knowledge : •  Oases : Known to the east and west, considered locations of various gods (e.g., Siwa for the god Amon ). •  Kushitic Region : Lay to the south, known as far as the 4th cataract . •  Punt : A region located south a...