Monday, March 31st, 2014 at 2:27 pm. Whether your central heating or air conditioning system is running, when you detect any unpleasant smell coming from the air wafting through the vents, you need to have professionals investigate the cause right away. These odorsâmusty, mold, acrid, or anything elseâusually mean something serious has gone wrong in the system.
In its simplest form, a raster consists of a matrix of cells (or pixels) organized into rows and columns (or a grid) where each cell contains a value representing information, such as temperature. Rasters are digital aerial photographs, imagery from satellites, digital pictures, or even scanned maps.
In raster datasets, each cell (which is also known as a pixel) has a value. The cell values represent the phenomenon portrayed by the raster dataset such as a category, magnitude, height, or spectral value. The category could be a land-use class such as grassland, forest, or road.ometimes you don't have the choice of storing your data as a raster; for example, imagery is only available as a raster. However, there are many other features (such as points) and measurements (such as rainfall) that could be stored as a feature (vector) data type (or both).