Raster Data Model and Structure: Characteristics and Resolution and Size Considerations (Especially for GATE-Geospatial 2022)

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It refers to storage of raster data so that it can be processed by the computer.

Raster Data Model

A raster is an array of cells, where each cell has a value representing a specific portion of an object or a feature. A point may be represented by a single cell, a line by a sequence of neighboring cells and a polygon by a collection of contiguous cells.

Figure Shows Raster Cell

All cells in a raster must be the same size, determining the resolution. The cells can be any size, but they should be small enough to accomplish the most detailed analysis.

Cells are arranged in rows and columns, the rows of the matrix are parallel to the x-axis of the Cartesian plane, and the columns to the y-axis.

This Figure Shows Cells Are Arranged in Rows and Columns

Resolution and Storage Size

Resolution can affect the data storage size. Storage requirements increase by the square of the image dimensions.

Resolution and Zoom of Images

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