| Type(s) |
Value added services
Value added services>Data production
|
| Owner |
The ALASKA SAR Facility Synthetic Aperture Radar Data : ASF |
| Organisation |
THE ALASKA SAR Facility |
| Abstract |
These images, created on request, have approximately 8 m resolution in slant range (the direction along which the radar signal travels) and cover an area of 30-40 km x 50 km. The data are formatted as 12,800 pixels x 2048 pixels x 32 bit complex integers (16 I, 16 Q) and are therefore about 100 MB in size. The complex data format implies real ('I') and imaginary ('Q') components. In this case, 'I' stands for a backscattered radar pulse's in-phase component, while 'Q' represents the quadrature component. When a backscattered radar pulse is sampled by the receiver, it is compared to a reference function (cosine, the function which was used to generate the transmitted radar pulse) and a quadrature function (sine, the reference function shifted 90 degrees). The results of these two comparisons are the return signal's 'I' and 'Q' components. For these products, the 'I' and 'Q' separation is maintained throughout processing. Therefore, these products' 'I' and 'Q' values can be used to regenerate the backscattered pulse's amplitude and phase values by the following equations: amplitude = sqrt(I^2 + Q^2), phase = atan(Q/I).
|
| Cross Reference(s) |
http://www.asf.alaska.edu/daac_documents/avail_data.html sar_complex_images
|
| Discipline(s) |
Snow & ice
|
Point of Contact
Other Information
| Spatial Coverage & Location(s) |
Lat: 63.26° - Lon: -147.47°
United States
|
| Temporal Coverage |
01/01/1999
|
| Language(s) of Resource |
English
|
|
Resources of same Organisation 
The ALASKA SAR Facility Synthetic Aperture Radar Data : ASF
 Dataset (6)
 Service (6)
Resources of same Type
Service>Value added services
Service>Value added services>Data production
|
