mTileHdr - Online in the Cloud

PROGRAM:

NAME

mTileHdr - Create a set of tiled images or header templates from a FITS file or header

SYNOPSIS

mTileHdr [-d] [-s statusfile] orig.hdr new.hdr nx ny ix iy [xpad [ypad]]

DESCRIPTION

Takes a header template file and creates another which represents one of a regular set of
tiles covering the original. The user specifies the tile gridding and which tile is
desired.

Only the NAXIS and CRVAL keyword lines are changed (pixel size and reference point
location); all other keyword values will be inherited from the input header.

OPTIONS

-d Turns on debugging.

-s statusfile
Output and errors are sent to statusfile instead of to stdout

ARGUMENTS

orig.hdr
ASCII header template from which to derive tiled headers

new.hdr
Path to output header

nx Number of tiles in the x-direction

ny Number of tiles in the y-direction

ix Integer identifying the x location of the output tile on the grid (counting from 0)

iy Integer identifying the y location of the output tile on the grid (counting from 0)

xpad Number of pixels to overlap tiles in the x direction (optional; default is 0)

ypad Number of pixels to overlap tiles in the y direction (optional; default is 0)

RESULT

[struct stat="OK", naxis1=xsize, naxis1=ysize, crpix1=xref, crpix2=yref]

Where xsize and ysize are the x and y dimensions of the image described by the output
header, and crpix1 and crpix2 are the new offset from the original reference pixel on the
sky.

MESSAGES

OK [struct stat="OK", naxis1=xsize, naxis2=ysize, crpix1=xref, crpix2=yref]

ERROR Cannot open status file: statusfile

ERROR (nx,ny) have to be positive integers and (ix,iy) have to be in the range (0..nx-1,
0..ny-1)

ERROR Cannot open output template new.hdr

ERROR Bad template:orig.hdr

ERROR Bad template:new.hdr

ERROR Output wcsinit() failed.

EXAMPLES

template.hdr is 850x850 pixels, and we want to generate the center tile out of 9 (3 by 3):

$ mTileHdr template.hdr tile_1_1.hdr 3 3 1 1
[struct stat="OK", naxis1=283, naxis2=283, crpix1=-283, crpix2=-283]

tile_1_1.hdr has the same reference location and pixel scale as the input header, but a
new pixel offset (CRPIX) and size (NAXIS).

Use mTileHdr online using onworks.net services