Thanks so much in advance! Sorry for my silly newbie question. Its consists of a matrix of cells ( pixels) organized into rows and columns ( grid) where each cell contains a value representing information. By printing the raster object, we can see. Raster Data Raster data represent real world data, within the GIS environment. The output produced by the stread() function indicates that the vector datasets are all in geographic coordinates. Raster data tends to require large amounts of computer memory. Raster data is not good for representing continuous information that spans an entire area. Vector data tends to have higher geographic accuracy than raster data. Spatial computation for vector data is limited. The Vector data represents are points, lines, and polygons. Vector data is good at illustrating continuous data, such as precipitation. While a raster image comprises of a series of individual colored pixels. In brief, raster data is continuous data whereas vector data is discrete data. The vector image consists of mathematical formulas that control the path of the image. Is this map raster or vector, and how can you tell in actual practice? Generally, they are a Latitude and Longitude value. What are the differences between raster and vector data The main difference between raster and vector data is that the raster data represents data as a cell or a grid matrix while vector data represents data using sequential points or vertices. It doesn't really seem anything like the examples from the lecture, where I saw the same road mapped in both vector or raster, or the same lake, for example. Here is where I am lost! I am looking at this interative map of where Thanksgiving dinner ingredients are produced, for example ( link), and it is a basic map of the united states with circles in each county, and the size of the circles represent how much of the ingredient is farmed in that county.Īttributes associated with each circle would be county name, # of acres of ingredient farmed there, and # of farms.īut for whatever reason, something is just not clicking for me to understand if this is raster or vector data - I want to guess raster because it seems like simpler data? but truly I have no idea. This all makes sense when thinking about very basic maps, but for an assignment this week I am supposed to take examples of maps and discuss weather the data presented is showing a vector or raster model of data. I have grasped that in theory, the difference between vector data and raster data is that vector data uses a series of lines and points to show where features are, where raster data is made up of pixels. Hello! I'm taking an online GIS course and we are covering spatial data models.
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