MACSIGMA0 - A MACINTOSH TOOL FOR ANALYZING JPL AIRSAR, ERS-1, JERS-1, AND
MAGELLAN MIDR DATA

MacSigma0 from NASA's Jet Propulsion Laboratory is an interactive tool for
the Macintosh which allows users to display and make computations from
radar data collected by the following sensors: the JPL AIRSAR, ERS-1,
JERS-1, and Magellan.

MacSigma0 provides four basic functions: synthesis of images (if
necessary), statistical analysis of selected areas, analysis of corner
reflectors as a calibration measure (if appropriate and possible), and
informative mouse tracking. For instance, the JPL AIRSAR data can be used
to synthesize a variety of images such as a total power image. The total
power image displays the sum of the polarized and unpolarized components
of the backscatter for each pixel. Other images which can be synthesized
are HH, HV, W, RL, RR, HHW*, HHHV*, HV W*, HHW* phase and correlation
coefficient images. For the complex and phase images, phase is displayed
using color and magnitude is displayed using intensity.

MacSigma0 can also be used to compute statistics from within a selected
area or to analyze corner reflectors as a measure of the calibration for
JPL AIRSAR, ERS-1, and JERS-1 data types. It computes a theoretical radar
cross section and the actual radar cross section for a selected trihedral
corner reflector. The theoretical cross section, measured cross section,
their ratio in dBs, and other information are displayed to the user and
can be saved into a text file.

MacSigma0, inventory number NPO-19060, is written in C-language for use on
Macintosh series computers. The minimum configuration requirements for
MacSigma0 are System 6.0, Finder 6.1, 1Mb of RAM, and at least a 4-bit
color or grey-scale graphics display. MacSigma0 is also System 7
compatible. MacSigma0 will print statistics on any output device which
supports QuickDraw, and it will print images on any device which supports
QuickDraw or PostScript. This program is a copyrighted work with all
copyright vested in NASA. Program $200; documentation $34.

COSMIC, The University of Georgia
382 East Broad St, Athens, GA 30602-4272
(706) 542-3265;  Fax: (706) 542-4807

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