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. |