This is the command mTileImage that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
mTileImage - 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).
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