Advanced Remote Sensing and GNSS for Resource Management
Detector Arrays and Sensor Calibration
1. Pushbroom Architecture: Pushbroom scanners use CCD or CMOS arrays consisting of thousands of detectors aligned perpendicular to the flight direction. Each detector continuously images a specific ground pixel line as the satellite moves forward.
2. Detector Material Types: Silicon CCD is used for visible/NIR (0.4–1.1 µm), InGaAs for SWIR (1–1.7 µm), and Mercury Cadmium Telluride (MCT) for thermal infrared. Each material has a different quantum efficiency
Read MoreGNSS and GIS Fundamentals: Systems, Analysis, and Applications
GNSS Constellation Comparison
| System | Country | Coverage | Key Feature | Application |
|---|---|---|---|---|
| GPS | USA | Global | 31 sats, L1/L2/L5 | Military, civilian |
| GLONASS | Russia | Global | 24 sats, high latitude | Arctic regions |
| Galileo | Europe | Global | Civilian controlled | SAR, timing |
| BeiDou | China | Global | 35+ sats, messaging | Asia transport |
| NavIC | India | Regional | 7 sats, L5 & S band | Disaster, military |
GPS Surveying Methods
| Feature | Static | Rapid Static | Kinematic |
|---|---|---|---|
| Observation Time | 30–60 minutes | 5–15 minutes | 1–2 sec/point |
| Accuracy | mm-level | cm-level | cm-level (RTK) |
| Receiver Movement | Stationary | Stationary | Moving |
Human Geography: From Sense of Place to Spatial Justice
The Concept of Place in Cultural Geography
In Cultural Geography, the concept of “place” is more than a set of coordinates on a map. In the 1970s, Human Geography emerged as a strong reaction against the quantitative “spatial space” of the 1950s and 1960s, which viewed space merely as an abstract. Human Geographers argued that a place is a meaningful site that combines three crucial elements: location, locale, and sense of place. Through human experience, perception, and emotional attachments, an
Read MoreThe Global History and Impact of Imperialism
Defining Imperialism and Its Scope
Imperialism is a state policy, practice, or advocacy of extending power and dominion, especially by direct territorial acquisition or by gaining political and economic control of other areas. Because it always involves the use of power—whether military, economic, or some subtler form—imperialism has often been considered morally reprehensible. Consequently, the term is frequently employed in international propaganda to denounce and discredit an opponent’s foreign
Read MoreIndia’s Economic and Social Transformation Since 1947
1. The Role of the Indian State in Economic Planning
After independence in 1947, India adopted a planned model of development in which the state played the central role in economic growth and nation-building. The leaders of independent India believed that colonial rule had left the economy weak, underdeveloped, and dependent on agriculture. Therefore, the government took responsibility for directing economic development through planning. The Planning Commission was established in 1950 under Jawaharlal
Read MoreBiological Control and Natural Farming: Sustainable Strategies
1. History and Concept of Biological Control
Biological control is a sustainable approach to managing pests and diseases by utilizing natural enemies, microbes, and botanical extracts. It is a cornerstone of natural farming, emphasizing ecological balance over chemical intervention.
Biological control is the intentional use of living organisms—predators, parasites, or pathogens—to suppress pest populations (Gontijo, 2025).
- Early Records: The practice dates back to at least 304 AD in China, where