Standard GRID input dataset (one dataset) Limitation: an input data set must be less than 20000 samples per line.
Standard GRID output dataset (one dataset) Limitation: an output data set must be less than 20000 samples per line.
A SIZE into the input file which is to be written to the output
file. SIZE is the standard size field format,
SIZE = (SL,SS,NL,NS) where
SL is the starting line to read
SS is the starting sample to read
NL is the number of lines to be written
NS is the number of samples in a line to be written
The default SIZE values are (1,1,0,0).
INT [intensity parameters]
The intensity parameters may be specified by two ways. Each
keyword may be followed by an integer, or all values may be specified
as INT=(x,x,x,x), where (x,x,x,x) refer to the values for REP, MUL,
ADD, and LIM, respectively.
The first parameter is the replace (REP) value, the second is the multiply
(MUL) value, the third is the add (ADD) value and the last one is the limit
(LIM) value (all defined later). Replace, multiply and add may not be used
together. And limit may be used only with multiply.
The keywords are as follows:
1. REP -- causes 'GRID' to replace the DN value of all pixels
in the network with a constant DN. If no other
intensity parameters are specified, all pixels in
the network are replaced by 255.
2. MUL -- causes 'GRID' to multiply each pixel in the overlay
by a constant which is 1/100 of the integer value.
The value of the pixel is then set equal to the
product, modulo 256. If the LIMIT parameter has
been specified, and the value is less than the of
LIMIT or greater than the value of (255-LIMIT),
it is set equal to LIMIT or (255-LIMIT) respectively.
If LIMIT value is not specified when MULTIPLY value
has been set, LIMIT is set to 64.
3. ADD -- causes 'GRID' to add a constant value to the DN
of each pixel in the overlay network. The resulting
value, modulo 256, is used in the output.
4. LIM -- see explanation of MULTIPLY.
(See under INT.)
(See under INT.)
(See under INT.)
(See under INT.)
GEO [geometric parameters]
'GRID' operates under the control of geometric parameters, which
control grid spacing and line length. GEO parameters may be assigned
by two ways. Each keyword may be followed by an integer, or all value
may be specified as GEO=(x,x,x,x,x), where (x,x,x,x,x) refer to the values
for BLI, LFS, SFS, LFL, and SFL, respectively. The keywords are as follows:
1. BLI -- the basic line interval (spacing) for the grid. The
default is 100.
2. LFS -- the long fiducial spacing (i.e.,the spacing
between the long fiducial marks perpendicular to the
grid lines). The default is 25.
3. SFS -- the short fiducial spacing (i.e., the spacing
between the short fiducial marks perpendicular to the
grid lines). The default is 5.
4. LFL -- the length of the long marks. Actual total
length will be (2 * LFL + 1), across the grid lines.
The default is 2.
5. SFL -- the length of the short marks. Actual
total length will be (2 * SFL + 1), across the grid lines.
The default is 1.
(See under GEO.)
(See under GEO.)
(See under GEO.)
(See under GEO.)
(See under GEO.)