Cassini image database & updates, And notifications of PDS data releases |
Cassini image database & updates, And notifications of PDS data releases |
Dec 25 2006, 08:52 PM
Post
#1
|
|
IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
I have noticed that the January 1, 2007 Cassini PDS release is already available, see http://pds-imaging.jpl.nasa.gov/data/cassi...assini_orbiter/
I haven't downloaded all of the imaging data and I'm just beginning to digest what I already have but there are some beautiful images of Enceladus' plumes and satellite mutual events, images of the G and D rings and interesting images of Saturn's nightside and fairly good Iapetus images. Radar and VIMS is also available. All in all a nice 'Christmas gift' . |
|
|
Aug 2 2007, 05:10 PM
Post
#2
|
|
Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
OK, I've had a slightly different go at it.
http://planetary.org/data/cassini/dioneattempt/index2.html This is a much improved 726k to download. Note that the links to full-size images still do NOT work. I used the 1 pix/degree cutoff this time (923 images) and incorporated more metadata, but am only showing one image from each multispectral set. I think I am happy with the number of observations included now -- I think it's more like 44 -- but am not totally happy with the page layout yet. I was hoping to come up with something where I could almost fully automate the generation of the html, but the step of deleting redundant images (something that's really necessary to reduce the amount of data on the browse page) has to be done by hand, and that's time consuming. Two things I forgot and will include in any future version: I wanted to put the file names in with the metadata, but they're not there (though they are preserved in the URLs, so at least you can see them that way); and I wanted to include the TARGET_LIST field at the end. EDIT: I added one more thing -- I was curious to see how many of these observations had resulted in products released to Photojournal. Many have, but many have not; and there are also a great many Photojournal releases of images where Dione was smaller than my size cutoff (though many of these were multiple-body images, so the small size made sense). Notes on Photojournal releases are now on the page. Also, the look through Photojournal made me realize that I missed all the opnavs, because these have a target of "SKY" -- I need to modify my query to add in those opnavs. There were 20 or so that were within the size range. I'm going to start uploading the full-size images now and leave it running overnight -- it's 800 Megs of data!! That's a bit more than I bargained for. Too many 16-bit images. Comments? --Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
|
|
|
Aug 3 2007, 02:45 PM
Post
#3
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
I'm going to start uploading the full-size images now and leave it running overnight -- it's 800 Megs of data!! That's a bit more than I bargained for. Too many 16-bit images. Comments? I really like the new layout, much more bandwidth friendly and the color-coded filters are also a nice touch. How did you find all those Photojournal releases derived from Dione sequences - manually by dates? One thing regarding the full size PNGs. They are 16 bit, but are very dark, perhaps a uniform scaling factor could be applied to all images to maximize DN in the PNGs. IIRC Bjorn's IMG2PNG does implement this feature. This would ideally be the highest scaling factor that keeps the brightest albedo object in the Saturnian system (i.e. Enceladus) from being overexposed, of course taking into account its weird zero-phase geometric albedo of 1.375. I don't know what scaling factor you currently use, but if low enough it might in fact reduce s/n ratio if the 12bit images are fit into 8 bit values. -------------------- |
|
|
Lo-Fi Version | Time is now: 26th September 2024 - 01:12 PM |
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |