Kerala Nipah outbreak LIVE UPDATES: Death toll rises to 10, two critical

നിപാ വൈറസ് ബാധ നിയന്ത്രിക്കുന്നതിന് എല്ലാ നടപടികളും സംസ്ഥാന സർക്കാർ സ്വീകരിച്ചിട്ടുണ്ട് എന്നു മുഖ്യമന്ത്രി അറിയിച്ചു. മുൻകരുതൽ എടുക്കുകയും ജാഗ്രത പുലർത്തുകയും വേണമെങ്കിലും പരിഭ്രാന്തിക്ക് ഒരടിസ്ഥാനവുമില്ലന്ന് അദ്ദേഹം പറഞ്ഞു. പരിഭ്രാന്തി പരത്തുന്ന പ്രചാരണം സമൂഹമാധ്യമങ്ങളിൽ നടക്കുന്നത് ദൗര്‍ഭാഗ്യകരമാണെന്നും ഇവ ശ്രദ്ധയിൽ പെട്ടിട്ടുണ്ട് എന്നും അദ്ദേഹം പറഞ്ഞു. ഇത്തരം പ്രചാരണങ്ങളിൽ നിന്ന് എല്ലാവരും മാറിനിൽക്കണമെന്ന് അഭ്യർത്ഥിക്കുന്നു. കേരളത്തിന് പുറത്തുനിന്ന് അടിസ്ഥാനമില്ലാത്ത ഒരുപാട് പോസ്റ്റുകൾ സമൂഹമാധ്യമങ്ങളിൽ വരുന്നുണ്ട്. ഇത്തരം പ്രചാരണങ്ങളിൽ നാം കുടുങ്ങിപ്പോകരുത്. ഭീതിയുണ്ടാക്കുന്ന രീതിയിൽ സമൂഹ മാധ്യമങ്ങളിലൂടെ പ്രചാരണം നടത്തുന്നത് കേരളത്തിന്റെ പൊതുതാൽപര്യത്തിന് ഹാനികരമാണെന്ന് തിരിച്ചറിയണമെന്നും മുഖ്യമന്ത്രി അഭ്യർത്ഥിച്ചു.

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Platforms in Remote Sensing

In remote sensing, a platform is the physical structure or vehicle that carries a sensor (camera, scanner, radar, etc.) to observe and collect information about the Earth's surface. Platforms are classified mainly by their altitude and mobility : Ground-Based Platforms Definition : Sensors mounted on the Earth's surface or very close to it. Examples : Tripods, towers, ground vehicles, handheld instruments. Applications : Calibration and validation of satellite data Detailed local studies (e.g., soil properties, vegetation health, air quality) Strength : High spatial detail but limited coverage. Airborne Platforms Definition : Sensors carried by aircraft, balloons, or drones (UAVs). Altitude : A few hundred meters to ~20 km. Examples : Airplanes with multispectral scanners UAVs with high-resolution cameras or LiDAR High-altitude balloons (stratospheric platforms) Applications : Local-to-regional mapping ...

Types of Remote Sensing

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...

Optical Sensors in Remote Sensing

1. What Are Optical Sensors? Optical sensors are remote sensing instruments that detect solar radiation reflected or emitted from the Earth's surface in specific portions of the electromagnetic spectrum (EMS) . They mainly work in: Visible region (0.4–0.7 µm) Near-Infrared – NIR (0.7–1.3 µm) Shortwave Infrared – SWIR (1.3–3.0 µm) Thermal Infrared – TIR (8–14 µm) — emitted energy, not reflected Optical sensors capture spectral signatures of surface features. Each object reflects/absorbs energy differently, creating a unique spectral response pattern . a) Electromagnetic Spectrum (EMS) The continuous range of wavelengths. Optical sensing uses solar reflective bands and sometimes thermal bands . b) Spectral Signature The unique pattern of reflectance or absorbance of an object across wavelengths. Example: Vegetation reflects strongly in NIR Water absorbs strongly in NIR and SWIR (appears dark) c) Radiance and Reflectance Radi...

Resolution of Sensors in Remote Sensing

Spatial Resolution 🗺️ Definition : The smallest size of an object on the ground that a sensor can detect. Measured as : The size of a pixel on the ground (in meters). Example : Landsat → 30 m (each pixel = 30 × 30 m on Earth). WorldView-3 → 0.31 m (very detailed, you can see cars). Fact : Higher spatial resolution = finer details, but smaller coverage. Spectral Resolution 🌈 Definition : The ability of a sensor to capture information in different parts (bands) of the electromagnetic spectrum . Measured as : The number and width of spectral bands. Types : Panchromatic (1 broad band, e.g., black & white image). Multispectral (several broad bands, e.g., Landsat with 7–13 bands). Hyperspectral (hundreds of very narrow bands, e.g., AVIRIS). Fact : Higher spectral resolution = better identification of materials (e.g., minerals, vegetation types). Radiometric Resolution 📊 Definition : The ability of a sensor to ...

geostationary and sun-synchronous

Orbital characteristics of Remote sensing satellite geostationary and sun-synchronous Orbits in Remote Sensing Orbit = the path a satellite follows around the Earth. The orbit determines what part of Earth the satellite can see , how often it revisits , and what applications it is good for . Remote sensing satellites mainly use two standard orbits : Geostationary Orbit (GEO) Sun-Synchronous Orbit (SSO) Geostationary Satellites (GEO) Characteristics Altitude : ~35,786 km above the equator. Period : 24 hours → same as Earth's rotation. Orbit type : Circular, directly above the equator . Appears "stationary" over one fixed point on Earth. Concepts & Terminologies Geosynchronous = orbit period matches Earth's rotation (24h). Geostationary = special type of geosynchronous orbit directly above equator → looks fixed. Continuous coverage : Can monitor the same area all the time. Applications Weather...

Vineesh V, Geography

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