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Name

ccdtrace - interpolate a set of coordinates from an image

Synopsis

ccdtrace [parameter=value]

Description

ccdtrace takes a set of (X,Y) coordinates, in the form of an ascii table(1NEMO) , and interpolates them from an image(1NEMO) . The output will also be in standard table format. The input coordinate must be in the physical coordinates of the input image, as defined by Xmin/Ymin/Dx/Dy coordinates (see tsf(1NEMO) to view them). Sky image copied via FITS can sometimes have unexpected units. See also fits(5NEMO) .

Parameters

The following parameters are recognized in any order if the keyword is also given:
in=image
Input Image(5NEMO) file. Currently only 2D images are supported, for 3D cubes the first plane could be used. No default.
out=xyi_table
Output table of X,Y,I coordinates. No default.
xytab=xy_table
Input table of X,Y coordinates (in units of the WCS of the input image). No default.
nmax=
Allocation space for input XY table, if needed. This value is only needed when the XY table is read from a device which cannot seek (e.g. a pipe). Default: 10000.
cumul=t|f
Add a 4th column in the output which is the culumative length, in the native units. Default: f
wcs=t|f
By default, the table is assumed to be in WCS (the units used in the image), but with wcs=f you can use pixel coordinates.

Files

src/nbody/evolve/flowcode/ccdtrace.c

See Also

ccdprint(1NEMO) , tsf(1NEMO) , image(5NEMO) , fits(5NEMO) , ccdfits(1NEMO)

Author

Peter Teuben

Update History


31-jul-96    V1.0 Created         Peter Teuben
26-sep-2001    V1.0a updated doc, fixed code for file_lines    PJT
26-jul-2015    V1.1 added cumul=t option    PJT
26-jul-2015     V1.2 added wcs=f option        PJT


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