rasterikarttoja

Rasterikartta, also known as a raster map or bitmap map, is a digital representation of geographic information where the map is divided into a grid of cells, also called pixels. Each cell in the grid holds a specific value that corresponds to a particular attribute or feature, such as elevation, land cover type, or temperature. Unlike vector maps, which use geometric shapes like points, lines, and polygons to represent features, raster maps store data in a continuous grid.

The resolution of a raster map is determined by the size of its cells. A higher resolution means smaller cells and therefore a more detailed representation of the geographic area. This detail, however, comes at the cost of larger file sizes. Raster maps are commonly used in applications like satellite imagery, aerial photography, and digital elevation models. They are well-suited for displaying continuous data and for performing spatial analysis that involves overlaying and combining different layers of information.

The creation of raster maps typically involves scanning existing paper maps or processing remotely sensed data. Data within a raster grid can be analyzed using various techniques, such as calculating statistics, identifying patterns, or modeling environmental processes. When working with raster data, it is important to consider the resolution and the extent of the grid to ensure accurate and meaningful results.