Esri grid

An Esri grid is a raster GIS file format developed by Esri, which has two formats:

  1. A proprietary binary format, also known as an ARC/INFO GRID, ARC GRID and many other variations
  2. A non-proprietary ASCII format, also known as an ARC/INFO ASCII GRID

The formats were introduced for ARC/INFO. The binary format is widely used within Esri programs, such as ArcGIS, while the ASCII format is used as an exchange, or export format, due to the simple and portable ASCII file structure.

The grid defines geographic space as an array of equally sized square grid points arranged in rows and columns. Each grid point stores a numeric value that represents a geographic attribute (such as elevation or surface slope) for that unit of space. Each grid cell is referenced by its x,y coordinate location.

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