- Ordinary Passport (Dark Blue) is issued to ordinary citizens for ordinary travel, such as for vacation, study and business trips (36 or 60 pages). It is a "Type P" passport, where P stands for Personal.
- Official Passport (White cover) is issued to individuals representing the Indian government on official business. It is a "Type S" passport, S stands for Service.
- Diplomatic Passport (Maroon cover) is issued to Indian diplomats, top ranking government officials and diplomatic couriers. It is a "Type D" passport with D stands for Diplomatic. .. Courtesy Wikipedia
Remote Sensing means collecting information about the Earth's surface without touching it , usually using satellites, aircraft, or drones . There are different types of remote sensing based on the energy source and the wavelength region used. 🛰️ 1. Active Remote Sensing 📘 Concept: In active remote sensing , the sensor sends out its own energy (like a signal or pulse) to the Earth's surface. The sensor then records the reflected or backscattered energy that comes back from the surface. ⚙️ Key Terminology: Transmitter: sends energy (like a radar pulse or laser beam). Receiver: detects the energy that bounces back. Backscatter: energy that is reflected back to the sensor. 📊 Examples of Active Sensors: RADAR (Radio Detection and Ranging): Uses microwave signals to detect surface roughness, soil moisture, or ocean waves. LiDAR (Light Detection and Ranging): Uses laser light (near-infrared) to measure elevation, vegetation...

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