Vineesh V, Geography

SPACE → PLACE → ENVIRONMENT → INTERCONNECTION → SUSTAINABILITY → SCALE → CHANGE → LANDSCAPES This sequence explains how geographers think: Where things are ( Space ), What makes locations unique ( Place ), What surrounds them ( Environment ), How they are connected ( Interconnection ), How they can be protected ( Sustainability ), At what level they are studied ( Scale ), How they change over time ( Change ), And how nature and humans shape the Earth's surface ( Natural and Cultural Landscapes ) Geographical Concept Major Contributor(s) Contribution Space Immanuel Kant, Fred K. Schaefer, David Harvey Kant viewed geography as the science of space. Schaefer emphasized spatial science, while Harvey explained spatial organization and spatial justice. Place Yi-Fu Tuan, Edward Relph De...

Photogrammetry is the science and technology of obtaining accurate measurements, maps, and 3D models from photographs . In simple words, it is the process of using photographs to measure the size, shape, height, and location of objects on the Earth's surface . Definition Photogrammetry = Photo (Light) + Grammetry (Measurement) It converts 2-dimensional (2D) photographs into 3-dimensional (3D) spatial information . Example If several photographs of a building are taken from different angles, photogrammetry can calculate: Height of the building Width and length Exact geographic location Complete 3D model This technique is widely used in: Topographic mapping GIS Remote sensing Urban planning Engineering Archaeology Agriculture Forestry Disaster management Development Photogrammetry has evolved through three major stages. 1. Analog Photogrammetry (19th Century–1960s) Thi...

A Geographic Information System (GIS) is more than a digital mapping tool. It is a comprehensive system for capturing, storing, managing, analysing, querying, and visualising spatial (geographic) and non-spatial (attribute) data . To maintain accurate spatial data and perform advanced analyses, GIS relies on three important concepts: Building Topology Data Query Geoprocessing and Automation These concepts ensure data integrity, efficient data retrieval, and automated spatial analysis , making GIS an indispensable tool in geography, environmental science, urban planning, disaster management, transportation, agriculture, and resource management. 1. Building Topology in GIS Topology is the mathematical and logical framework that defines the spatial relationships between geographic features such as points, lines, and polygons. It ensures that spatial data maintain correct geometric relationships even after editing or analysis. Simple Definiti...

Remote sensing is the science and art of obtaining information about objects, areas, or phenomena without making direct physical contact with them. It works by detecting and measuring electromagnetic radiation (EMR) reflected or emitted from the Earth's surface using sensors mounted on satellites, aircraft, drones, balloons, or ground-based platforms . Definition (Lillesand & Kiefer) Remote sensing is the science and art of acquiring information about an object, area, or phenomenon through the analysis of data acquired by a device that is not in physical contact with the object. Ideal Remote Sensing An Ideal Remote Sensing System is a theoretical model in which every component functions perfectly without any errors or disturbances. Although such a system does not exist in reality, it provides a standard for understanding real remote sensing systems. An ideal remote sensing system is one that acquires accurate, complete, distortion-free, an...

Health Geography (formerly Medical Geography ) is the branch of geography that studies the relationship between health, disease, environment, place, and healthcare systems . The discipline has evolved over more than 2,500 years through contributions from physicians, geographers, epidemiologists, microbiologists, and public health experts. The development of Health Geography can be divided into the following periods: Ancient Period Medieval Period Renaissance and Pre-Modern Period Nineteenth Century (Pre-World War Era) World War Period Post-World War Period Modern Health Geography 1. Ancient Period (5th Century BC – 500 AD) Characteristics Health closely linked with the natural environment. Diseases explained through climate, water, air, and seasons. No knowledge of microorganisms. Medical observations were descriptive. Major Concepts Environmental Determinism Disease Ecology Climate and Healt...

Remote sensing is the science of collecting information about the Earth's surface without physically touching it . It works by detecting and measuring electromagnetic radiation (EMR) that is emitted or reflected by objects. 1. Energy Sources What is an Energy Source? An energy source is anything that produces electromagnetic radiation (EMR). Without energy, remote sensing cannot detect objects. Definition Energy Source: The origin of electromagnetic energy that illuminates or is emitted by an object so that a sensor can detect it. Types of Energy Sources A. Natural Energy Source (Passive Remote Sensing) The Sun is the most important natural energy source. Produces visible light, infrared, and ultraviolet radiation. Sunlight travels through space and reaches the Earth. Objects absorb part of this energy and reflect the remaining energy. Satellites measure this reflected energy. Examples ...

Spatial data creation is the process of generating, organizing, and managing geographically referenced information in a Geographic Information System (GIS). It involves converting maps, satellite images, GPS observations, and field survey data into digital datasets that can be stored, analyzed, and visualized. The quality of GIS analysis depends largely on the accuracy of spatial data creation. 1. Creation of Shapefile and Geodatabase A. Shapefile A Shapefile is one of the most widely used vector data formats developed by Esri for storing geographic features. Definition A shapefile stores the geometry and attributes of geographic features such as points, lines, and polygons. Components of a Shapefile A shapefile consists of several files: .shp – Stores geometry (shape) .shx – Shape index .dbf – Attribute table .prj – Coordinate Reference System (CRS) .sbn/.sbx – Spatial index (optional) Geometry Types Point – W...