Elias smiled. The 1998 coastline was now a digital vector line, sitting on top of the 2023 satellite imagery.
"Supervised Classification," he commanded. erdas imagine software
This is the top-tier desktop solution. It includes everything from the previous tiers plus: Elias smiled
Consider the humble Landsat satellite. It hurtles through space at 17,000 mph, collecting photons reflected from a 30-meter by 30-meter patch of Earth. That single pixel contains the reflected light of asphalt, grass, shadow, and a car roof. Standard GIS software struggles here—it wants to classify that pixel as one thing. ERDAS IMAGINE, through techniques like and Spectral Unmixing , does the hard work. It looks at the ratio of Band 4 (Near-Infrared) to Band 3 (Red) and deduces: “32% concrete, 58% vegetation, 10% shadow.” This is the top-tier desktop solution