worldtopixel

Worldtopixel is a web-based tool that allows users to convert geographical coordinates into corresponding pixel locations on a given map image. It essentially acts as a bridge between real-world spatial data and its representation within a digital image. Users typically upload a map image, such as a scanned historical map, a satellite image, or a custom-drawn map, and then provide a set of known real-world coordinates that are visible on that map. By marking these known points on the map image and inputting their corresponding real-world coordinates, Worldtopixel calculates a transformation. This transformation enables the tool to determine the pixel coordinates for any other point on the map, given its real-world coordinates, or vice-versa. This functionality is particularly useful for applications like georeferencing historical maps, digitizing spatial data from images, or overlaying precise geographical information onto visual representations. The underlying mathematical principle often involves a form of affine transformation or polynomial fitting to accurately warp the image and align it with the desired coordinate system. The output can then be used in various geospatial software or for further analysis.