Broken link on PSFEx PDF documentation on the main page
The link to PSFEx user's manual appearing on the main PSFEx page is broken. Can you fix this link, please, so the users have access to the latest version of the manual?..
View ArticleInsert/preserve thumbnail values within large mosaic
So far, I've had good luck with SWarp. When combined with Scamp it is producing wonderful results. The one thing that I haven't figured out how to do, yet, is insert/preserve a thumbnail within a...
View ArticleHow to compute proper motions ?
Hi I have an image of about a 100 year old photographic plate. I can get a preliminary astrometry for the image by using the Astrometry.net service, and I have run the image through Sextractor. Then I...
View ArticleBest Settings for Extremely Wide FIeld Data
Hi all- I have some extremely wide field (~ 85 deg FOV) and surprisingly deep images (approximately 8th mag, leading to thousands of stars in the image and a clearly resolved Milky Way ) of the sky...
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No valid source found
Hi, I am trying to use a catalog file that was produced by sextractor (started from astrometry.net). I have the files catalog.fits (input catalog), scamp.conf (config file) and refcatalog.fits...
View Articlescamp problems to query reference catalog
Hi, I first intented to reply to the "No valid source found" thread by olebole but now start a new thread as this is different in a couple of aspects. In my case I get no valid sources from reference...
View ArticleHow does scamp determine the reference point?
Normally, we setup initial WCS CRPIX to the center of the image and the CRVAL to the pointing. After scamp calibration, both CRPIX and CRVAL are shifted. So I want to know the rule how to determine the...
View ArticleDetermining camera+lens distortions with Scamp
Hi I am digitizing old astronomical photographic glass plates with a digital camera, and I want to determine the distortions caused by the camera+lens combination. I have got the following recipe: 1)...
View ArticleDelete all FITS keywords?
Is there any way to delete all the keywords from one FITS image header? Otherwise, could I replace one existing long header of an existing image with another small set defined in ASCII format? Many...
View ArticlePoor astrometric solution with UCAC-4
Hello all, on several fields I came across poor astrometric solution when using UCAC-4. There was always much better solution with UCAC-3 on the same images. The most obvious difference was the...
View ArticleBug: image offset by 1 column
I recently switched from stiff version 2.4.0 to 2.6.1. Unfortunately the new version suffers from a bug which causes the image to roll by 1 pixel to the left. I'd much appreciate an updated program...
View Articledwarf galaxies
Hi, any idea how to set Sextractor parameters to make it see a (nearby) dwarf galaxy as a single galaxy and not a bunch of stars? Anyone had an experience with dwarfs?
View ArticleSTABILITY_TYPE =- PREDISTORTED mode?
Does anyone have more information about how the STABILITY_TYPE=PREDISTORTED mode works? Does scamp expect a "scamp-type" distortion solution (i.e. PV keywords) in the header? If I then ask scamp to...
View ArticleHow can I save the astrometry error result as text file ?
Hi, As I know, I can check astrometry result from only PS images. But, when I deal with a lot of data, checking images one by one is very hard work. So, I want to know how result data can save to text...
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Tricks to install scamp plplot/qhull in openSUSE Tumbleweed
Dear Folks, I've noted that the installation of scamp in new LINUX boxes is an issue. For many LINUX distributions, default plplot libraries are version 5.11 or higher and the library libplplotd.so.11...
View ArticleSegmentation map missing object
I am using SExtractor 2.19.5 and have come across a bug that seems to have been reported back in 2008. In rare instances, we are seeing that a detected object is not present in the segmentation map,...
View ArticleSegmentation fault
I am new to scamp. I have used sextractor on many occasions.. I got the segmentation fault with scamp. I believe I may not be running it properly. In short, first I run sextractor with: sex -c...
View ArticleBackground Subtraction issue when swarping
Hi all, I have a question related to the background subtraction of SWarp (v2.38.0). I was trying to combine a list of images into a single mosaic. Hence I would like to subtract the background of each...
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A pattern in simulated image.
Hi all, I'm trying to simulate HST/ACS F606W and F814W band images. After using Stuff to create a mock catalogs for both bands, on simulated images the pattern is clearly visible (see image: left panel...
View ArticleScamp fails to run
Hi, I successfully installed scamp-2.0.4, however, when I try to test if it works correctly following the install by typing 'scamp' in the command line, I get the following error message: dyld: Library...
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