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ARC ASCIIGRID refers to a specifc interchange format developed f= or ARC/INFO rasters in ASCII format. The format consists of a header that s= pecifies the geographic domain and resolution, followed by the actual grid = cell values. Usually the file extension is .asc, but recent versions of ESR= I software also recognize the extension .grd. It looks like this:=20 =20
Coordinates may be in decimal or integer format. DD:MM:SS format for geo= detic coordinates is not supported.=20
ncols refers to the number of columns in the grid and xxxxx is the numer= ical value=20
nrows refers to the number of rows in the grid and xxxxx is the numerica= l value=20
xllcorner refers to the western edge of the grid and xxxxx is the numeri= cal value=20
yllcorner refers to the southern edge of the grid and xxxxx is the numer= ical value=20
cellsize refers to the resolution of the grid and xxxxx is the numerical= value=20
nodata_value refers to the value that represents missing data and xxxxx =
is the numerical value. This is
optional and your pa= rser should not assume it will be present. Note: that if you need a good va= lue, the ESRI default is -9999.
These are the value of individual cell typically representing elevation = of a particular area.=20
val(nox,noy) (f) =3D individual grid values, column varying fastest in i= nteger format. Grid values are stored as integers but can be read as floati= ng point values.=20
xllcorner and yllcorner are given as the EDGES of the grid, NOT the cent= ers of the edge cells. ARC/INFO supports other header strings that allow th= e centers of the edge cells to be given using xllcenter and yllcenter inste= ad. The origin of the grid is the upper left and terminus at the lower righ= t.=20
ARC format grids are single-band files.