This topic introduces the basic concepts related to Raster SQL.

Term Description
raster object The raster that is short for a raster object. It is regular grids into which space is divided. Each grid is called a cell. Each cell is assigned an attribute value to represent a data model of an entity. A raster object can be a satellite image, digital elevation model (DEM), or picture.
cell/pixel The raster cell. It is also called a pixel. This indicates that a cell is a grid in a raster object. Each cell can have different data types, such as Byte, Short, Int, Double.
band The raster band. A band is a single matrix of cell values in a raster object. A raster object can have multiple bands.
chunk The raster chunk. You can customize the size of a chunk, such as 256 × 256 × 3.
pyramid The raster pyramid. The downsampled version of a source raster object. A pyramid can contain multiple downsampled layers. Consecutive pyramid layers are downsampled at a scale of 2:1. Layer 0 stores the raw data.
pyramid level The layer of a raster pyramid.
mosaic The operation to integrate multiple raster objects into an existing raster dataset.
interleaving The interleaving method of pixels in a raster. The interleaving methods are band sequential (BSQ), band interleaved by pixel (BIP), and band interleaved by line (BIL).
world space The world coordinate space. It indicates the geographic coordinate space of a raster object.
raster space The coordinate space of a raster. It indicates the pixel coordinate space of a raster object. The upper-left corner of the raster is used as the starting point.
metadata The metadata of a raster, including the spatial range, projection type, and pixel type. The metadata of the remote sensing platform is excluded.