Computer cartography

Computer cartography, also known as digital cartography, blends art, science, and technology to create and use maps via computers. While it marked a major shift in map production, it remains a branch of traditional cartography. Its core job is generating maps—whether accurate depictions of areas for navigation, highlighting major roads and landmarks, or creating thematic maps. This field is a key function of geographic information systems (GIS), but GIS is not required for computer cartography and does much more than just make maps. Research papers on using computers for cartography were published several years before full GIS systems appeared. Computer cartography powers many applications, often by linking with the Global Positioning System (GPS) satellite network. This enables real-time, automated map generation, such as in car navigation systems. **History**

**From paper to paperless** In 1959, Waldo Tobler published "Automation and Cartography," introducing the first concept of computers helping with cartography. He described a "map in–map out" (MIMO) system that could digitize traditional maps, modify them, and reproduce them. Though simple, this system established computer mapmaking in academic literature and paved the way for later geographic information systems developed by geographers like Roger Tomlinson. Rapid progress followed, leading to a shift where computer-aided cartography replaced traditional methods. Mark Monmonier predicted this in his 1985 book *Technological Transition in Cartography*, suggesting GIS-driven computer cartography would largely replace pen-and-paper work. The milestone of more maps being created and distributed by computer than by hand is thought to have occurred around the mid-1990s. **Expanded capabilities** Early digital maps worked much like paper maps, offering a "virtual view" of roads set against the surrounding terrain. As GPS technology expanded over the past decade, digital maps gained features like live traffic updates, points of interest, and service locations, making them more "user conscious." Traditional virtual views are now just one option; users can often choose between virtual maps, satellite (aerial) views, or a hybrid of both. Because digital maps can be updated, newly built roads and places can be added quickly. Three-dimensional landscape maps can be created using 3D scanners or 3D reconstruction software. **Data collection** Digital maps depend on vast amounts of data gathered over time. Most of this information comes from satellite imagery and street-level data. Maps must be updated frequently to give users the most accurate picture of a location. While many companies specialize in digital mapping, the basic goal is to portray roads as they actually appear, providing a "life-like experience."

**Functionality and use**

**Computer applications** Both proprietary and non-proprietary software and apps provide imagery and street-level map data for much of the world. **Scientific applications** The rise of mobile computing (PDAs, tablet PCs, laptops) around the year 2000 boosted the use of digital mapping in science and applied sciences. By 2009, fields using this technology included geology (digital geological mapping), engineering, architecture, land surveying, mining, forestry, environmental science, and archaeology. **GPS navigation systems** The main driver of digital mapping's growth over the past decade has been its link to GPS technology. GPS is the foundation of digital mapping navigation systems. **How it works** A terrestrial GPS receiver gets coordinates, position, and atomic time from GPS satellites orbiting Earth. This data gives the digital mapping software a starting point and a destination to calculate distance. The software then analyzes and compiles the information to create a map showing the easiest, most efficient route. More technically, the device works like this: The GPS receiver collects data from at least four satellites to calculate its position in three dimensions. It then uses this position to provide GPS coordinates (exact latitude and longitude points). These coordinates are accurate to within about 10 to 20 meters of the actual location. The starting point (from GPS coordinates) and the ending point (an address or coordinates entered by the user) are fed into the digital mapping software. The software outputs a real-time visual map of the route, which moves along as the driver travels. If the driver leaves the designated route, the system uses the current coordinates to recalculate a new path to the destination.