The lines on a map are created by cartographers, who use a variety of techniques and tools to accurately represent geographic features such as coastlines, borders, and roads. These lines are based on data collected from satellite imagery, aerial photography, ground surveys, and other sources.
The determination of the lines on a map depends on the specific purpose of the map. For example, political boundaries are determined by treaties and agreements between countries, while topographic lines are determined by contour lines representing changes in elevation. Land surveying and GIS technology also play a role in the determination of map lines.
The accuracy of map lines varies depending on the scale of the map and the data sources used. Generally, maps with larger scales (e.g. street maps) will have more accurate lines than maps with smaller scales (e.g. world maps). Additionally, maps are constantly being updated as new data becomes available, so the accuracy of map lines may change over time.
Map lines are typically created and updated by cartographers, geographers, and surveyors who work for government agencies, private companies, or academic institutions. These professionals use specialized knowledge and tools to accurately depict geographic features on maps.
Yes, map lines can change over time due to a variety of factors. Natural events such as erosion, earthquakes, and volcanic eruptions can alter the physical features represented by map lines. Political changes, such as the creation of new borders or the renaming of places, can also result in changes to map lines. Additionally, as technology and data collection methods improve, map lines may be updated to reflect more accurate information.