Raster data is like a big picture made up of small squares called pixels . Each pixel shows some information about a small part of the Earth's surface, like how hot, bright, or green that spot is. Pixels Pixels are the tiny squares in a raster image. Just like how your phone screen is made of pixels, a satellite image also has pixels. Each pixel tells us something about the place it covers. DN Values (Digital Numbers) Each pixel has a number inside it, called a DN value . This number tells us what's going on in that area — for example: A high number might mean a bright area, A low number might mean a dark area. It can also show things like temperature , elevation , or vegetation . Bands Some satellite images have one band (like black-and-white photos). Others have many bands , each showing a different kind of light: Red, green, and blue (like what we see with our eyes), Near-infrared (helps us see plants and vegetation), Thermal (shows ...
Focused on advancing knowledge and expertise in Geography, GIS, Remote Sensing, Geographical Data Science, and Analysis, I am deeply committed to teaching and conducting research in these fields. With a keen interest in leveraging data-driven approaches for informed decision-making, I specialize in crafting maps that facilitate effective analysis and interpretation of spatial information. Assistant Professor Of Geography, PG and Research Department of Geography, Government College Chittur