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

# xcorr(1)

xcorr

## NAME

xcorr - xcorr

## SYNOPSIS

**xcorr** *master.PRM aligned.PRM* \[*-time*\] \[*-real*\] \[*-freq*\] \[*-nx n*\] \[*-ny n*\] \[*-xsearch xs*\] \[*-ysearch ys*\]

## DESCRIPTION

This program is part of GMTSAR.

-

  xcorr \[GMTSAR\] - Compute 2-D cross-correlation of two images

master.PRM      PRM file for reference image aligned.PRM                     PRM file of secondary image **-time**                   use time cross-correlation **-freq**                   use frequency cross-correlation (default) **-real**                   read float numbers instead of complex numbers **-noshift**                ignore ashift and rshift in prm file (set to 0) **-nx**  nx                 number of locations in x (range) direction (int) **-ny**  ny                 number of locations in y (azimuth) direction (int) **-nointerp**               do not interpolate correlation function **-range\_interp** ri        interpolate range by ri (power of two) \[default: 2\] **-norange**                do not range interpolate **-xsearch** xs             search window size in x (range) direction (int power of 2 \[32 64 128 256\]) **-ysearch** ys             search window size in y (azimuth) direction (int power of 2 \[32 64 128 256\]) **-interp**  factor         interpolate correlation function by factor (int) \[default, 16\] **-v**                      verbose output:

-

  freq\_xcorr.dat (default) time\_xcorr.dat (if **-time** option))

use fitoffset.csh to convert output to PRM format

Example: xcorr IMG-HH-ALPSRP075880660-H1.0\_\_A.PRM IMG-HH-ALPSRP129560660-H1.0\_\_A.PRM **-nx** 20 **-ny** 50 xcorr file1.grd file2.grd **-nx** 20 **-ny** 50 (takes grids with real numbers)

Usage: xcorr master.PRM aligned.PRM \[-time\] \[-real\] \[-freq\] \[-nx n\] \[-ny n\] \[-xsearch xs\] \[-ysearch ys\] master.PRM      PRM file for reference image aligned.PRM                     PRM file of secondary image **-time**                   use time cross-correlation **-freq**                   use frequency cross-correlation (default) **-real**                   read float numbers instead of complex numbers **-noshift**                ignore ashift and rshift in prm file (set to 0) **-nx**  nx                 number of locations in x (range) direction (int) **-ny**  ny                 number of locations in y (azimuth) direction (int) **-nointerp**               do not interpolate correlation function **-range\_interp** ri        interpolate range by ri (power of two) \[default: 2\] **-norange**                do not range interpolate **-xsearch** xs             search window size in x (range) direction (int power of 2 \[32 64 128 256\]) **-ysearch** ys             search window size in y (azimuth) direction (int power of 2 \[32 64 128 256\]) **-interp**  factor         interpolate correlation function by factor (int) \[default, 16\] **-v**                      verbose output:

-

  freq\_xcorr.dat (default) time\_xcorr.dat (if **-time** option))

use fitoffset.csh to convert output to PRM format

Example: xcorr IMG-HH-ALPSRP075880660-H1.0\_\_A.PRM IMG-HH-ALPSRP129560660-H1.0\_\_A.PRM **-nx** 20 **-ny** 50 xcorr file1.grd file2.grd **-nx** 20 **-ny** 50 (takes grids with real numbers)