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.
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
Where:
ncols are the numbers of rows (represented as integers);
and nrows are the numbers of rows (represented as integers);
xllcorner and yllcorner are the western (left) X coordinate and southern (bottom) Y coordinates, such as easting and northing (represented as real numbers with an optional decimal point)
cellsize is the length of one side of a square cell (a real number)
nodata_value is the value that is regarded as "missing" or "not applicable"; this line is optional, but highly recommended as some programs expect this line to be declared (a real number).
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.
.AIG, .ASC, .AGR, .GRD
No import options dialog is displayed.
Didger does not currently expor this format.
See Also