Write matrix to an ASCII raster file
Writes a data frame to an ASCII raster file, suitable for display in a Geographic Information System.
epi.asc(dat, file, xllcorner, yllcorner, cellsize, na = -9999)
dat |
a matrix with data suitable for plotting using the |
file |
character string specifying the name and path of the ASCII raster output file. |
xllcorner |
the easting coordinate corresponding to the lower left hand corner of the matrix. |
yllcorner |
the northing coordinate corresponding to the lower left hand corner of the matrix. |
cellsize |
number, defining the size of each matrix cell. |
na |
scalar, defines null values in the matrix. NAs are converted to this value. |
Writes an ASCII raster file (typically with *.asc extension), suitable for display in a Geographic Information System.
The image function in R rotates tabular data counter clockwise by 90 degrees for display. A matrix of the form:
| 1 | 3 |
| 2 | 4 |
is displayed (using image) as:
| 3 | 4 |
| 1 | 2 |
It is recommended that the source data for this function is a matrix. Replacement of NAs in a data frame extends processing time for this function.
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.