Rasters are digital aerial photographs, imagery from satellites, digital pictures, or even scanned maps.
Temperature, air pressure, soil PH, ecotones, elevation, flow, and distance are some example of raster data. However, administrative borders, linear features, roads, and rivers are some examples of vector data.
Vector data is represented as a collection of simple geometric objects such as points, lines, polygons, arcs, circles, etc. For example, a city may be represented by a point, a road may be represented by a collection of lines, and a state may be represented as a polygon.
Raster Data
In an alternate sense, we can consider a digital photograph as an example of a raster dataset. Here each cell, which in this instance is referred to as a pixel, corresponds to a particular colour value.
Popular types of raster files include JPEG, PNG and GIF images.
Three main sources of raster basemaps are orthophotos from aerial photography, satellite imagery, and scanned maps.
The most common raster file types include JPG, GIF, PNG, TIF, BMP, and PSD.
Raster Data are more into storing temperature, elevation, depth and soil pH value related data. The colour contrast varies from. Location to location and also depends on various geographical features covering the area. Two types of Raster data are Discrete Raster Data and Continuous Raster Data.
The vector map is the same Google map your users are familiar with using, and offers a number of advantages over the default raster tile map, most notably the sharpness of vector-based images, and the addition of 3D buildings at close zoom levels.
Other examples of vector quantities are displacement, acceleration, force, momentum, weight, the velocity of light, a gravitational field, current, and so on.
Vector data is split into three types: point, line (or arc), and polygon data.
Raster images are often used in digital photography, as well as in web design and other applications where a high-resolution image is needed. Because of the way they are stored, raster images can sometimes appear "blocky" or "pixelated" when they are enlarged.
An example of random scan is a pen plotter. A TV set is an example of raster scan. Random scan has lower refresh rate about 30 to 60 times per second. Raster scan has higher refresh rate about 60 to 80 times per second.
Vector graphics are digital art that is rendered by a computer using a mathematical formula. Raster images are made up of tiny pixels, making them resolution dependent and best used for creating photos.
Raster graphics are made up of orderly arranged colored pixels to display any image whereas, vector graphics are composed of paths using a mathematical formula that is a vector that directs the route and shape. Raster images are more capable of rendering complex, soft-colored, vibrant multi-colored visuals.
The word "raster" has its origins in the Latin rastrum (a rake), which is derived from radere (to scrape). It originates from the raster scan of cathode ray tube (CRT) video monitors, which paint the image line by line by magnetically or electrostatically steering a focused electron beam.
The spatial distribution of raster and vector data can be placed into two descriptive categories: discrete data and continuous data. While both raster and vector data can contain data with either discrete or continuous, most often, vector data is described as discrete while raster is described as continuous.
JPEGs. JPEGS (Joint Photographic Experts Group) are one of the best known raster image formats and what's known as a 'lossy', which means that when you save the image, it partially discards some image data to compress the image.
The most popular raster graphic file formats include JPEG, PNG, and GIF. Popular vector graphic file formats include SVG, AI, PDF and EPS.
Digital photos and detailed graphics both come in raster form. Popular types of raster files include JPEG, PNG, and GIF images.
Examples of raster image file types are: BMP, TIFF, GIF, and JPEG files.
The PostScript (. ps) file is unusual because it is not a raster image at all but rather a vector image (see the discussion on PostScript files). Finally, the JPEG image (. jpg) is the smallest image and is a full 24 bit color image but it is compressed using a lossy compression scheme.