---
name: "ALOS_pre_process"
section: "1"
platform: "linux"
package: "gmtsar-core"
version: "6.5+ds-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/ALOS_pre_process"
---

# ALOS\_pre\_process(1)

ALOS\_pre\_process

## NAME

ALOS\_pre\_process - ALOS\_pre\_process

## SYNOPSIS

**ALOS\_pre\_process** *imagefile LEDfile* \[*-near near\_range*\] \[*-radius RE*\] \[*-swap*\] \[*-V*\] \[*-debug*\] \[*-quiet*\]

## DESCRIPTION

This program is part of GMTSAR.

creates data.raw and writes out parameters (PRM format) to stdout

imagefile       ALOS Level 1.0 complex file (CEOS format): LEDfile         ALOS Level 1.0 LED file (CEOS leaderfile format):

-

  options:

**-near** near\_range        specify the near\_range (m) **-radius** RE              specify the local earth radius (m) **-swap**                   do byte-swap (should be automatic) **-nodopp**                 does not calculate doppler (sets fd1 to zero!) **-npatch**                set the number of patches **-fd1** \[DOPP\]             sets doppler centroid \[fd1\] to DOPP **-quad**                  adjust parameters for quad pol mod (PRF/2) **-ALOSE**                 use ERSDAC format **-ALOS**                  use AUIG format (default) **-LED**                   write GMTSAR generic LED format output and update PRM (default) **-noLED**                 do not write GMTSAR generic LED format output **-roi**                   write roi\_pac format output **-V**                      verbose write information) **-debug**                 write even more information **-quiet**                 don't write any information **-force\_slope** chirp\_slope       force a value for the chirp slope **-chirp\_ext** chirp\_ext           force a value for the chirp extension (integer) **-tbias**     tbias               correct the clock bias (positive value means plus) Example: ALOS\_pre\_process  IMG-HH-ALPSRP050420840-H1.0\_\_A LED-ALPSRP050420840-H1.0\_\_A

Usage: ALOS\_pre\_process imagefile LEDfile \[-near near\_range\] \[-radius RE\] \[-swap\] \[-V\] \[-debug\] \[-quiet\]

creates data.raw and writes out parameters (PRM format) to stdout

imagefile       ALOS Level 1.0 complex file (CEOS format): LEDfile         ALOS Level 1.0 LED file (CEOS leaderfile format):

-

  options:

**-near** near\_range        specify the near\_range (m) **-radius** RE              specify the local earth radius (m) **-swap**                   do byte-swap (should be automatic) **-nodopp**                 does not calculate doppler (sets fd1 to zero!) **-npatch**                set the number of patches **-fd1** \[DOPP\]             sets doppler centroid \[fd1\] to DOPP **-quad**                  adjust parameters for quad pol mod (PRF/2) **-ALOSE**                 use ERSDAC format **-ALOS**                  use AUIG format (default) **-LED**                   write GMTSAR generic LED format output and update PRM (default) **-noLED**                 do not write GMTSAR generic LED format output **-roi**                   write roi\_pac format output **-V**                      verbose write information) **-debug**                 write even more information **-quiet**                 don't write any information **-force\_slope** chirp\_slope       force a value for the chirp slope **-chirp\_ext** chirp\_ext           force a value for the chirp extension (integer) **-tbias**     tbias               correct the clock bias (positive value means plus) Example: ALOS\_pre\_process  IMG-HH-ALPSRP050420840-H1.0\_\_A LED-ALPSRP050420840-H1.0\_\_A