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<< Click to Display Table of Contents >> Focusing - ENVISAT ASAR - ASAR IM |
  
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<< Click to Display Table of Contents >> Focusing - ENVISAT ASAR - ASAR IM |
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SAR RAW data (level 0 product) acquired by ENVISAT ASAR must be focused to generate Single Look Complex (SLC) data, which can be used as first input for data processing in any other module.
This module supports ASAR Image Mode (IM) acquisition mode data.
Technical Note
ENVISAT ASAR RAW (level 0) ESA standard format is required. The level 0 filename is formatted as ASA_IM_0*, where IM stands for Image Mode.
The output product consists of Single Look Complex data.
DORIS
DORIS (Doppler Orbitography and Radiopositioning Integrated by Satellite) data provide precise orbital information for ENVISAT ASAR. Two versions of DORIS data are available:
-The VOR (Verified ORbits) are the most precise ones, but they are made available not earlier than one month after the actual satellite acquisition.
-The POR (Precise ORbits) are slightly less precise than the VOR, but they are made available together with the ASAR data.
Access to DORIS data is provided by the ESA Earth Observation Help Desk.
If the relevant DORIS files are already stored in an existing folder, which has been defined as DORIS Directory, they do not have to be inputted in the import processing panel since they are automatically retrieved by the program.
Technical details relevant to the data focusing process and algorithm are provided in the module overview.
Input Files
Input File List
File name(s) of the original ASAR raw data. These files are mandatory.
Parameters - Principal Parameters
Rename the File Using Parameters
If set, only relevant information will be copied from the input name(s) to the output name(s), the full root name otherwise.
Parameters - Global
It brings to the general section of the Preferences parameters. Any modified value will be used and stored for further processing sessions.
Parameters - Other Parameters
RFI
SWST
It brings to the general section of the Preferences parameters. Any modified value will be used and stored for further processing sessions.
Output Files
Output File List
Output file name(s) of the focused data. These files are mandatory.
_slc
Zero-Doppler annotated Single Look Complex data and corresponding header files (.sml, .hdr).
.shp
Shape file containing the image perimeter in geographic co-ordinates.
.kml
ASCII file containing the image perimeter in geographic co-ordinates. Double clicking on this file will automatically position the boundaries of the scene into the Google Earth environment.
SARscapeParameterExtracted
Temporary processing parameters.
Details specific to the Units of Measure and Nomenclature of the output products can be found in the Data Format section.
General Functions
Exec
The processing step is executed.
Store Batch
The processing step is stored in the batch list. The Batch Browser button allows to load the batch processing list.
Close
The window will be closed.
Help
Specific help document section.
Specific Function(s)
None.
Task, SARscapeBatch object, SARscapeBatch script example
References A. Peternier, J.P. Merryman Boncori and P. Pasquali, "Near-real-time focusing of ENVISAT ASAR Stripmap and Sentinel-1 TOPS imagery exploiting OpenCL GPGPU technology", Remote Sensing of Environment, In Press, Available online 14 April 2017, doi: 10.1016/j.rse.2017.04.006 Refer to the module overview.