Convert Data to ROI_PAC's RAW format

FOR ERS DATA
This is done with the script make_raw.pl

usage: make_raw.pl ORBIT_TYPE LEADER_FILE DATE

ORBIT_TYPE = [ODR/PRC/HDR] - See David's Schmidt's webpage
For ERS data, attempt to use the Delft ODR orbits first. If these are not available, use ESA's PRC orbits. If these are also not available, use the orbital information contained in the data headers, by typing HDR as the ORBIT_TYPE.
We should have most available ODR and PRC files on the system at Oxford. To check their file locations type
echo  $SAR_ODR_DIR $SAR_PRC_DIR

LEADER_FILE = name of the SARLEADER* file. If you wish to process a multiframe slc image, make sure all of the loaded datafiles are in the same directory, and just select the SARLEADER file of the first image (the filename with the lowest number). make_raw will automatically process all the data in the same directory into a single concatenated raw data file.

DATE = {yymmdd}

• IMPORTANT: After processing the raw data, check the DOPPLER_RANGE0 values in *.raw.rsc files.
  If |DOP| > 0.5 then subtract or add 1 (See Frequently Encountered Problems)
  You may also wish to plot "dop.out" for both frames (e.g. using 'xmgrace date1/dop.out date2/dop.out').

FOR ENVISAT DATA
This is done with the script make_raw_envi.pl

usage: make_raw_envi.pl IMAGE_FILE ORBIT_TYPE DATE

IMAGE_FILE   = name of ASA_IM* file.

ORBIT_TYPE = [DOR/HDR] Usually this should be set to DOR (= DORIS orbit). The script looks for a precise orbit. If it cannot find one, it uses the preliminary orbit. If the orbits need updating, update them.

DATE = {yymmdd}
NOTE, make_raw_envi.pl is now aliased to make_raw_envi_subset.pl. The usage is the same as above, except that the image can be cut by a specified latitude range. For usage type make_raw_envi.pl