The right ascension and declination widths must be in arcminutes. The x and y widths must be in pixels. X and Y pixel width values are distinguished from ra and dec width values by a trailing 'p' character. The survey images are assumed to have a common projection system and cutouts are aligned to the nearest pixel. Undefined pixels in the cutouts are assigned the value blank .
Users can also specify their own output image names in output.
Create an image database for the survey images in the subdirectory data. Update the previous database after some new images are added to the survey directory. The entire database will be rewritten. Make B and R band cutouts of the above region from the images which have the largest area of overlap with the extraction region. Do not trim the images.