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Raster maps, also known as bitmap or image maps, are digital maps that are made up of a grid of pixels. Each pixel contains a value that represents a specific feature or characteristic of the area it represents. Raster maps are commonly used to display satellite imagery, topographic maps, and other types of geographic data.
The pixels in a raster map are typically square and uniform in size. The number of pixels in a map determines its resolution, with higher resolutions providing more detail and accuracy. For example, a high-resolution satellite image might have millions of pixels per square kilometer, while a lower-resolution topographic map might have only a few hundred pixels per square kilometer.
Raster maps can be created using a variety of sources, including aerial photography, satellite imagery, and LiDAR (Light Detection and Ranging) data. Once the data has been collected, it is processed and converted into a raster format, which can then be displayed and analyzed using GIS (Geographic Information System) software.
One of the main advantages of raster maps is their ability to display detailed information about the terrain and environment. For example, a satellite image can show vegetation cover, water bodies, and geological features with high accuracy. Additionally, raster maps can be used to create 3D models of the terrain, which can be used for simulations, analysis, and planning.
However, raster maps have some limitations. Because each pixel represents a single value, it can be difficult to accurately represent features that are smaller than a single pixel. Additionally, raster maps can be memory-intensive, as they require a large amount of data to represent a given area at high resolution.
Examples of raster maps include: