ANSI-C program: multi_look.c
NAME
multi_look - Generates multi-look intensity image from SLC image
in either fcomplex or scomplex format SLC
SYNOPSIS
multi_look <SLC> <SLC_par> <MLI>
<MLI_par> <rlks> <azlks> [lbegin] [nlines]
[scale] [exp]
| <SLC> | (input) SLC image file (fcomplex) |
| <SLC_par> | (input) SLC parameter file |
| <MLI> | (output) MLI image file (float) |
| <MLI_par> | (output) Multi Look Intensity (MLI) image parameter file |
| <rlks> | range looks for multi-looking |
| <azlks> | azimuth looks for multi-looking |
| [loff] | offset to starting line in the input data (default=0) |
| [nlines] | number of SLC lines to process (default=to end of file) |
| [scale] | scale factor for output MLI (default = 1.0) |
| [exp] | exponent for the output MLI (default = 1.0) |
EXAMPLE
multi_look 19960421.slc 19960421.slc.par 19960421.mli
19960421.mli.par 1 5
DESCRIPTION
multi_look reads the complex valued input SLC image and
generates a real valued multilook intensity image (MLI). A new
parameter file to characterize the file dimension and geometry of
the MLI image is also created. The number of range and azimuth
looks used in the multi-looking are specified on the command line
and the offset to the starting line and number of input lines can
be specified.
The main use of multi_look is in the interferometric processing with registered SLC images. In this case the SLC are first registered, then the interferogram is generated using the program SLC_intf. In this case the multi-look intensity images are created using multi_look. In order to obtain multi-look intensity images which are registered to the complex interferogram the number of range and azimuth looks, the starting line, and the number of lines have to set to the same values as used in the calculation of the interferogram.
multi_look take into account SLC line headers (as indicated in the SLC parameter file. The output multi-look intensity image has no line header. The output MLI may be scaled using a command line parameter. A scale factor 1.e-06 is used to generate multi-look images for MSP processed radiometrically calibrated SLC images in short integer format. The user also has the option to apply an exponent that is other than 1.0 to the output values. An exponent of 0.5 will produce output values that are proportional to the image magnitude rather than the image intensity.
SEE ALSO
SLC_intf, multi_real, multi_cpx, typedef_ISP.h,
© Copyrights for Documentation, Users Guide and Reference Manual by Gamma Remote Sensing, 2007.
UW, CW, last change 26-Jul-2007.