ASC Arc/Info ASCII Grid File Description

Didger imports ASC Arc/Info ASCII grid files.


An ESRI grid is a raster GIS file format developed by ESRI. The ASCII format is also known as Arc/Info ASCII grid. The ASCII format is used as an exchange, or export format, with a simple ASCII file structure.


File Format

The first six lines of the file indicate the reference of the grid, followed by the values listed in the order they would appear (left to right and top to bottom).



ncols         4

nrows         6

xllcorner     0.0

yllcorner     0.0

cellsize      50.0

NODATA_value -9999

 -9999 -9999 5 2

-9999 20 100 36

3 8 35 10

32 42 50 6

88 75 27 9

13 5 1 -9999



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) and are delimited using a single space character.


File name extensions



Import Options Dialog

No import options dialog is displayed.


Export Options

Didger does not currently expor this format.


See Also

File Format Chart