> Anyone know how to import an arc/info grid file in e00 format into MI? I
> know arclink translates e00files, but it doesn't seem to understand e00 grid
> files. Alternatively, anyone know where the format might be documented?
The Arc/Info grid file format is a proprietary binary format. You can
import from and export to the following generic grid formats (and thence
into Vertical Mapper for example) using either Arc/Info or ArcView
Spatial Analyst.
>From the documentation:
Binary:
The binary raster file format is a simple format that can be used to
transfer raster data between various applications. It consists of two files,
the IEEE floating-point file and a supporting ASCII header file. The
header file must have the same name as the data file, but with a .hdr file
extension. The header data includes the following keywords and values:
ncols - number of columns in the data set.
nrows - number of rows in the data set.
xllcenter or xllcorner - x-coordinate of the center or lower-left corner of
the lower-left cell.
yllcenter or yllcorner - y-coordinate of the center or lower-left corner of
the lower-left cell.
cellsize - cell size for the data set.
nodata_value - value in the file assigned to cells whose value in
unknown. This keyword and value is optional. The nodata_value defaults
to -9999.
byteorder - the byte order of the binary cell values. You can choose
between two keywords, msbfirst or lsbfirst. Msbfirst is used for cell
values written with the most significant bit first. Lsbfirst is used for cell
values written with the least significant bit first.
For example,
ncols 480
nrows 450
xllcorner 378923
yllcorner 4072345
cellsize 30
nodata_value -32768
byteorder msbfirst
The data file will be a matrix of 32 bit signed IEEE floating-point values.
The file will have a line of binary numbers for each row in the data set.
The first line of data is the top row of the data set, moving from left to
right.
ASCII:
The ASCII raster file format is a simple format that can be used to
transfer raster data between various applications. It is basically a few
lines of header data followed by lists of cell values. The header data
includes the following keywords and values:
ncols - number of columns in the data set.
nrows - number of rows in the data set.
xllcenter or xllcorner - x-coordinate of the center or lower-left corner of
the lower-left cell.
yllcenter or yllcorner - y-coordinate of the center or lower-left corner of
the lower-left cell.
cellsize - cell size for the data set.
nodata_value - value in the file assigned to cells whose value is
unknown. This keyword and value is optional. The nodata_value defaults
to -9999.
For example,
ncols 480
nrows 450
xllcorner 378923
yllcorner 4072345
cellsize 30
nodata_value -32768
43 3 45 7 3 56 2 5 23 65 34 6 32 etc
35 45 65 34 2 6 78 4 38 44 89 3 2 7 etc
etc
The first row of data is at the top of the data set, moving from left to
right. Cell values should be delimited by spaces. No carriage returns are
necessary at the end of each row in the data set. The number of
columns in the header is used to determine when a new row begins.
The number of cell values must be equal to the number of rows times
the number of columns.
--------------------------------------------
Justin Hyland, Ph.D.
ComputaMaps, PO Box 13190, Mowbray, 7705
Cape Town, South Africa
tel: 27-021-423 1609, fax: 27-021-423 1603, cell: 083-763-8029
e-mail: [EMAIL PROTECTED]
URL: http://maps.co.za
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