---
name: "coadd"
section: "1"
platform: "linux"
package: "astrometry.net"
version: "0.97+dfsg-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/coadd"
---

# coadd(1)

Co-add images for astrometry.net

## NAME

coadd - Co-add images for astrometry.net

## SYNOPSIS

**coadd** *image* *ext* *weight* *ext* *wcs* *ext*...

-

  use "none" as weight filename for no weighting

## OPTIONS

- **-w** *file*

  Output WCS file (default: input file)

- **-e** *extension*

  FITS extension to read WCS from (default: primary extension, 0)

- **-o** *file*

  Output image file

- **-O** *order*

  Lanczos order (default 3)

- **-p** *plane*

  Image plane to read (default 0)

- **-N**

  Use nearest-neighbour resampling (default: Lanczos)

- **-s** *sigma*

  Smooth before resampling

- **-D**

  Divide each image by its weight image before starting

- **-v**

  More verbose

## AUTHOR

The Astrometry.net team. Principal investigators are David W. Hogg (NYU) and Dustin Lang (CMU).

## SEE ALSO

http://astrometry.net