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| USGS Earth Resources Observation and Science Center (EROS) |
The Multi-Look Complex (MLC) data product is a CEOS-formatted frame image that is 100 km along the flight track by the swath width (which will vary with the viewing geometry and the radar mode). This image is in ground range with natural spacing and is full resolution. The pixel spacing is selectable in the processor and will either be 12.5 meters or 25 meters. For 12.5 m pixel spacing, the azimuth resolution is 25 m and the range resolution is 25 m or natural resolution if exceeding 25 m. For 25 m pixel spacing, resolutions are 50 m in range and azimuth. The data products are fully calibrated and contain all the data channels that were collected.
The multi-look data product is intended for users who have experience with radar data and use it to study the radar signatures (polarimetry) of an area. Since these products are in a ground range projection (referenced to ground coordinates), they are frequently used by physical scientists who also work in the field. MLC images have less speckle than SLC images due to the averaging of multiple looks. MLC products are typically used by science investigators for quantitative analysis and generation of high-level products.
There are two possible data formats for cross-products data, depending on polarization mode.
SIR-C multi-look data consist of:
All the multi-look products consist of one file for each scene, per frequency. Each line of the file consists of varying range samples (based on datatake), in which range increases with sample number. The number of lines per file also varies based on datatake. Each line corresponds to different azimuth or along track locations. Data are multi look complex cross-product data for the quad and dual polarization cases and multi-look detected power values for the single polarization case. The bytes present depend on the polarization mode. For the quad polarization case, the data have been symmetrized such that SHV = 0.5 (SHV+SVH).
These datafiles, depending on the mode, (which determines swath and number of channels) can be hundreds of megabytes for each scene
Since this data product is in the CEOS format, you will need the JPL CEOS Reader Software and associated programs in order to read these data.
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