The language behind raster analysis Map algebra is a conceptual language designed specifically for cell-based geographic information systems. It provides the theoretical foundation for cartographic modeling, that is, using maps not just to display data, but to analyze and derive new spatial information. The idea of map algebra comes from work originally presented by Joe… Continue reading
Posts Tagged → spatial analysis
Stack, Clip, Intersect! How GIS Overlay Analysis Turns Maps into Answers
The Power of Overlay: Making Maps Think for You Maps are great at showing us where things are, but GIS goes a step further by helping us understand how things relate to each other spatially. One of the most powerful ways GIS does this is through overlay analysis, a technique that works with both vector… Continue reading
What on Earth Are Thiessen Polygons and Why Should We Care?
If you’ve ever wondered how to split an area fairly without starting a territorial argument, Thiessen polygons (also called Voronoi polygons) are your new best friend. Think of them as the GIS equivalent of drawing invisible “zones of influence” around points, each polygon claiming the area closest to its point compared to any other.