TroubleShooting: Sexagesimal Invalid Values

Mark Mayer

I posted the problematic data set :( !!!   

Your video helped me better understand what was going on, and thank you very much, but I'm still confused.

For the images without a WCS entry, manually correcting the offending RA/DEC '10.60' value to '11.00' allowed WBPP to open and process the images.Yeah! But the images which had WCS values could not be loaded and processed by WBPP. If I followed your video correctly, '10.60' was the intrinsic value present in all images, and this was over ridden by the WCS solution. But if this is true why could these images be loaded and processed without a problem after deleting the WCS data, without my editing the RA/DEC values?

Mark Mayer

I watched the video again, and now understand what's happening. When I opened the files with WCS entries in the header using PixInsight, the OBJCTRA OBJCTDEC values were updated with the values calculated from the WCS data. I then deleted the WCS values and saved the file, leaving the updated OBJCTRA OBJCTDEC values in the header. 

I'm guessing that my deleting the WCS values probably had no consequence, and it was simply opening and saving the files using PI that caused the OBJCTRA OBJCTDEC values to be updated and stored.

BlockHead

Correct. Juan addresses this. WBPP is not loading calculated values... all of the calculated stuff only applies to images loaded in PI. When WBPP opens images... it is not "loading them" like in the program. It is opening them from the disk as is. So if there are offending sexagesimal values... there will be a problem. 

So deleting WCS stuff would not have changed how WBPP handles things... the invalid values would have been loaded. Deleting the WCS stuff would affect what we SEE when we open the file in PI- it would not recalculate anything and you *would* have seen the invalid entries. This is what made it so goddamn confusing- With a WCS in place... Juan CLOBBERS (this is a technical programming term) the values and makes it very very confusing!

-the Blockhead

P,S. I probably should have made this point clear in my video.