Each grid point stores a numeric value that represents a geographic attribute (such as elevation or surface slope) for that unit of space.
In Esri grid data, the first six lines indicate the reference of the grid, followed by the values listed in "English reading order" (left-right and top-down).
This could be encoded into an ASCII grid file, that would look like: where The remainder of the file lists the raster values for each cell, starting at the upper-left corner.
These real numbers (with optional decimal point, if needed) are delimited using a single space character.
A multiple-band grid (a collection of grids also known as a "stack" in ArcGIS) cannot have more than 9 characters in its file name, and a single-band raster dataset cannot have more than 13 characters.