On Dec 17, 3:02 pm, Matthew Gates <matthew...@gmail.com> wrote: > On 17 December 2010 12:57, kfj <_...@yahoo.com> wrote: > > > > > The tiles come with a cornucopia of metadata, most of which exceed my > > admittedly narrow astronomic horizon - what I seem to have gleaned, > > though, is that the projection is gnomonic and localization of the > > individual images should be easy straight from the metadata. What I > > need for a trial stitch in hugin (from which we might be able to > > derive the vignetting data) is translation of the astronomical > > nomenclature in the hhh files into hugin's system. Hugin uses a notion > > of roll, pitch and yaw. I suspect roll will be zero for the images, > > pitch would refer to the center of the image and be in degrees from > > the equator and yaw to the center of the image in degrees from any > > reference point on the equator you care for, maybe you could point me > > to which of the metadata to touch for the purpose and how to translate > > them, if necessary. I suspect the relevant data are in the 'Hour > > Angle' and 'Zenith distance' data fields in the hhh file, hour angle > > could be translated straight into yaw, and Zenith distance would be > > pitch + 90 degrees? I could then extract them from the hhh files. > > Alternatively, put small files with the images containing roll, pitch > > and yaw in degrees - then I wouldn't have to do the extraction > > myself ;-) > > I hope Fabien will join in the conversation here. He's been dealing > with the processing of these images into the toast projection and so > is much more familiar with this stuff than me. > > >> The x64 directories in the .tgz files might be useful here, as they > >> are full-plate at low res. We could maybe extract these, experiment > >> with blending and even stitch them together into a panorama to check > >> it. 1792 300x300 tiles isn't so bad. > > >> I can do the extraction of this data on the server and create a single > >> archive file which should be a manageable size. > > > Sounds very good; I fully agree, hope to see the data soon!
Hi, I'm Fabien from Stellarium brought here by Matthew. > Here's a tarball with the x64 images and their associated meta-data files: > > http://porpoisehead.net/misc/dss_low.tar.gz(~11 meg) > > I'm assuming the N??? ones are for the Northern hemisphere and the > S??? files are for the Southern hemisphere, but this should become > apparent from the metadata analysis. Yes N stands for North, S for South. So I am not not completely sure what we need as input: I think for what we need we can make the assumption that the plate projection is gnomonic. In this case I can extact the lon/lat positions of the 4 corners of each plate. Then what do we need to do with that? Can the .pto be generated from just that? Fabien > Matthew -- You received this message because you are subscribed to the Google Groups "Hugin and other free panoramic software" group. A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ To post to this group, send email to hugin-ptx@googlegroups.com To unsubscribe from this group, send email to hugin-ptx+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/hugin-ptx
