IEEE GRSS Student Branch Chapter - University of Moratuwa

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GIS Fact of the Week!Why Every Raster Image Looks “Blocky” When You Zoom In ❓In GIS, raster data (like satellite images ...
27/05/2026

GIS Fact of the Week!

Why Every Raster Image Looks “Blocky” When You Zoom In ❓

In GIS, raster data (like satellite images and DEMs) is made up of tiny squares called pixels.
Each pixel stores a single value - such as color, elevation, or temperature. 🧮

🌍The important concept is called spatial resolution:

A 10 m resolution image means 1 pixel = 10 m × 10 m on the ground.
Higher resolution = more detail.
Lower resolution = larger pixels and less detail.

That’s why satellite images become blurry or blocky when you zoom too far - you are actually seeing the individual pixels.🏙️

💡Real Example !

Sentinel-2 imagery has 10 m resolution for visible bands.
Landsat 8 visible bands have 30 m resolution.

So, Sentinel-2 can capture finer ground details compared to Landsat 8.

💡Simple Analogy!

Think of raster data like a mosaic made of tiles:

Smaller tiles → clearer picture
Bigger tiles → less detail
Why This Matters in GIS

🖊️Spatial resolution affects:

Land cover mapping
Urban analysis
Change detection
Precision in measurement

🌍 Beyond What We SeeThe human eye sees only a fraction of reality.Satellites, however, can detect what remains invisible...
18/05/2026

🌍 Beyond What We See

The human eye sees only a fraction of reality.
Satellites, however, can detect what remains invisible to us - from vegetation stress and soil moisture to hidden environmental changes. 🍃

Through remote sensing, we are not just observing Earth; we are understanding it in ways never before possible. 💫

Sometimes, the most important insights are the ones we cannot see. 🌐

📸 : Illustration of the integration of Sentinel-1 radar satellites, CubeSats, and drone-based precision mapping to monitor Earth’s resources and vegetation using multi-band signal pe*******on. (Courtesy from Google)

🔍 Beyond What We See…More than 70% of our planet is covered by oceans—yet much of the seafloor remains less explored tha...
13/05/2026

🔍 Beyond What We See…

More than 70% of our planet is covered by oceans—yet much of the seafloor remains less explored than the Moon or Mars. 🌕

Thanks to advancements in Synthetic Aperture Radar (SAR) and satellite altimetry, we can now map underwater landscapes from space. These technologies help scientists detect hidden features like seamounts, deep-sea trenches, and tectonic structures without ever going beneath the surface. 🏔️

This is the power of geoscience and remote sensing: revealing the unseen and expanding our understanding of Earth in ways once thought impossible.🛰️

🌊 From space to seafloor, innovation continues to bridge the gaps in exploration.

📸pc : Image: David Sandwell, Scripps Institution of Oceanography, UC San Diego

🌍 Fact of the WeekDid you know?A single 30 m × 30 m pixel in a NASA Landsat image represents an actual ground area of 90...
06/05/2026

🌍 Fact of the Week

Did you know?

A single 30 m × 30 m pixel in a NASA Landsat image represents an actual ground area of 900 square meters on Earth. 🔃

That means one pixel can contain roads, trees, rooftops, soil, and water all mixed together. This is known as the mixed pixel problem in remote sensing. 📇

Because of this, image classification and land cover mapping are not just about colors, they depend heavily on spectral signatures, spatial resolution, and image processing techniques to determine what truly exists within each pixel. ⁉️

This is why higher-resolution satellites are critical for urban mapping, precision agriculture, and disaster monitoring. 📡

📸 : A natural-color mosaic of the Big Island of Hawaii in 2023. (From NASA)

🚀 We’re Officially on YouTube!The IEEE Geoscience and Remote Sensing Society Student Branch Chapter at the University of...
30/04/2026

🚀 We’re Officially on YouTube!

The IEEE Geoscience and Remote Sensing Society Student Branch Chapter at the University of Moratuwa is excited to announce the launch of our official YouTube channel! 🎥🌍

As the first ever IEEE GRSS Student Branch Chapter in Sri Lanka 🇱🇰, this platform marks another milestone in our journey to promote Geoscience, Remote Sensing, GIS, Earth Observation, and space-related technologies among students and young researchers.

To begin this journey, we have released our very first video showcasing the growth and milestones of our chapter so far, highlighting the passion, teamwork, and vision that continue to drive us forward.

✨ Through this channel, we aim to share:
• Event highlights
• Educational and technical content
• Industry insights
• Student experiences
• Workshops, competitions, and future initiatives

📺 Watch our first video here:
https://youtu.be/sIaNdUpGDVI

🔔 Subscribe to our YouTube channel:
https://youtube.com/?si=GDBJe3DPvUJlDIc5

Join us !!

27/04/2026

🚀 We’re excited to announce the launch of the Official IEEE GRSS Student Branch Chapter YouTube Channel!

This platform is dedicated to exploring the power of Geoscience and Remote Sensing - bringing satellite data, earth observation, and real-world applications closer to you.

🎬 Stay tuned for:
* Satellite Image Insights
* Real-World Case Studies
* Quick Learning Series

📢 Launching Soon - don’t miss our first video!

🌐 Signal from SpaceDid you know that even the vast, ever-moving oceans can be measured from space with centimeter-level ...
27/04/2026

🌐 Signal from Space

Did you know that even the vast, ever-moving oceans can be measured from space with centimeter-level precision? 📐

Using Satellite Altimetry, scientists monitor subtle changes in sea surface height to uncover powerful insights about our planet. 🌍
From tracking rising sea levels to understanding ocean currents and climate patterns, these tiny variations tell a much bigger story about Earth’s future.✨

As climate challenges grow, space-based observations continue to play a crucial role in helping us understand, predict, and respond to global changes. 🔎

📸 pc : Artist's impression of the Sentinel-1 satellite in orbit. Image courtesy of ESA/ATG medialab.

“We don’t inherit the Earth, we borrow it from the future.” 🌍This Earth Day (April 22), let’s reflect on the responsibil...
22/04/2026

“We don’t inherit the Earth, we borrow it from the future.” 🌍

This Earth Day (April 22), let’s reflect on the responsibility we carry, not just as individuals, but as a global community. 💫

From monitoring climate change to tracking deforestation and natural disasters, Earth observation technologies are helping us understand and protect our planet like never before. 🛰️

But awareness alone isn’t enough, action is what truly makes the difference.🌱

Let’s return this planet better than we found it.🌿


Seeing the Unseen with Radar 🛰️ Did you know that satellites equipped with Synthetic Aperture Radar (SAR) can “see” the ...
20/04/2026

Seeing the Unseen with Radar 🛰️

Did you know that satellites equipped with Synthetic Aperture Radar (SAR) can “see” the Earth’s surface regardless of weather conditions or time of day?

Unlike optical imaging systems, SAR actively emits microwave signals and measures their return after interacting with the Earth’s surface. Because these signals can pe*****te clouds, rain, and even vegetation to some extent, SAR becomes a game-changer for continuous Earth observation.

🚨 Why does this matter?
During extreme events like floods, cyclones, and landslides, visibility is often at its worst, exactly when accurate data is most critical. 🌊

💡 SAR enables near real-time monitoring of affected areas, helping authorities:

• Map flood extents even under dense cloud cover
• Track changes in terrain and infrastructure damage
• Support faster, data-driven disaster response and recovery

Satellite missions like Sentinel-1 have made SAR data widely accessible, empowering researchers, governments, and organizations worldwide.

📡 In a world facing increasing climate uncertainties, technologies like SAR are not just innovative, they’re essential.

📸 pc : Sentinel-1 SAR Mission (Active radar imaging of the Earth’s surface for disaster management and resource monitoring)

GRSS Fact of the Week: Artemis II🚀 Did you know?Artemis II is the first mission in over 50 years to send humans around t...
13/04/2026

GRSS Fact of the Week: Artemis II

🚀 Did you know?
Artemis II is the first mission in over 50 years to send humans around the Moon — but it doesn’t land!

Instead, it’s a crewed lunar flyby mission designed to test deep-space systems before future Moon landings. The mission carried 4 astronauts farther from Earth than any humans since the Apollo era, reaching record-breaking distances.

🌍 Even cooler:
This mission made history with the first woman, first person of color, and first non-American to travel to the Moon!

💡Why it matters:
Artemis II is a major step toward building a sustainable human presence on the Moon—and eventually missions to Mars.

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