Raster
A spatial data model representing the world as a grid of equally sized cells (pixels), each with a value for a specific attribute (e.g., elevation, temperature, land cover). Raster data is fundamental for continuous data analysis and remote sensing.
What does Raster mean?
A raster is a data model used in GIS (Geographic Information Systems) that displays geographical data as a grid of uniformly sized cells, or pixels, with a value indicating information like temperature, elevation, land cover, or satellite imagery in each cell.
Important Features of Raster Data:
Grid Structure: A matrix made up of rows and columns.
Cell Values: The numerical values stored in each cell can be either continuous (e.g., elevation) or categorical (e.g., land use type).
Resolution: The spatial resolution is determined by the size of each cell; smaller cells provide finer detail.
Origin: Frequently utilized in image processing and remote sensing.
When examining continuous data over a region, a raster—a grid-based method for representing geographical information—is very helpful. Vector data, on the other hand, makes use of polygons, lines, and points.
Related Keywords
A sort of spatial data known as raster data is displayed in a grid of rows and columns, with a value indicating information like elevation, temperature, or land cover in each cell (pixel). It is frequently used to simulate continuous data over a geographic area in remote sensing and GIS.
Digital images known as raster graphics are composed of a grid of tiny pixels, each of which has a distinct colour value. Because they are resolution-dependent, enlarging them results in a reduction in image quality. Photographs and detailed images are frequently stored in common formats including JPEG, PNG, and GIF.
A grid of tiny squares called pixels, each with a distinct colour value, makes up raster images, which are digital images. In contrast to vector drawings, they can lose clarity when scaled up, but they are perfect for depicting intricate visuals like photos or satellite imagery. Typical formats are TIFF, PNG, and JPEG.
In GIS, vector data employs points, lines, or polygons to represent discrete objects like buildings or roads, whereas raster data uses a grid of cells to express continuous information like elevation.