|
|
|
Foundation ::
Navigation and Radar ::
SIGMA0
|
SIGMA0
A Tool for Analyzing JPL Airsar Data and Byte Images
|
 |
Moderators:
Adopt This Application!
|
|
|
|
|
SIGMA0 is an interactive tool which allows you to display and analyze radar data in the JPL AIRSAR compressed stokes data format. SIGMA0 will also read byte images.
The JPL AIRSAR system is a multi-polarimetric airborne synthetic aperture radar developed and operated by the Jet Propulsion Laboratory. It includes the single-frequency L-band sensor mounted on the NASA CV990 aircraft and its replacement, the multi-frequency P-, L-, and C-band sensors mounted on the NASA DC-8. SIGMA0 works with data in the standard JPL AIRSAR output product format, the compressed Stokes matrix format.
SIGMA0 provides four basic functions:
- Synthesis of images (if necessary)
- Statistical analysis of selected areas
- Informative mouse tracking
- Export of radar images as byte, TIFF or BMP files.
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, VV, RL, RR, HHVV*, HHHV*, HVVV*, HHVV* phase and correlation coefficient images. For the complex and phase images, phase is displayed using color and magnitude is displayed using intensity. SIGMA0 can also be used to compute statistics from within a selected area. The statistics computed depend on the image type. For JPL AIRSAR data, the HH, HV, VV, HHVV* phase, and correlation coefficient means and standard deviation measures are calculated. The mean, relative standard deviation, minimum, and maximum values are calculated for all other data types. A histogram of the selected area is also calculated and displayed. The selected area can be rectangular, linear, or polygonal in shape. The statistics and histogram are displayed to the user and can either be printed or saved as a text file.
Grey scale computed images can be saved in a byte format (a headerless format which saves the image as a string of byte values), BMP format, or TIFF format. Color images can also be saved in BMP or TIFF formats.
SIGMAO is available in two machine versions: an IBM PC version and a Macintosh version. The IBM PC version of SIGMAO carries the NASA case number COS-10082 and the Macintosh version of SIGMAO carries the NASA case number NPO-19060. SIGMAO was originally released as part of the COSMIC collection.
|
|
More software from National Technology Transfer Center
|
|
|
|
|
|
