Magellan EDR/RAW Data |
Magellan EDR/RAW Data |
Sep 11 2020, 09:03 PM
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#1
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Member Group: Members Posts: 411 Joined: 18-September 17 Member No.: 8250 |
Just curious, has anyone gone spelunking in the Magellan SAR EDR (raw) dataset?
https://pds-imaging.jpl.nasa.gov/data/magellan/edr/ Looks like a set of 9-track mag tapes were copied to CD-ROMs for preservation, and at some point the CD files were put online in PDS. In starting to look at it, I realized that lack of knowledge of mag tape volume/label/file/record structure and terminology may impede younger explorers of this dataset. |
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Sep 11 2020, 10:38 PM
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#2
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Solar System Cartographer Group: Members Posts: 10191 Joined: 5-April 05 From: Canada Member No.: 227 |
I have used the mosaicked (tiled) data, not the raw 'noodle' data (long strip from one orbit). But I completely agree that much better access is needed, beginning with a good map-based search tool. I haven't checked for quite a while, though. Must be 10 years since I worked on Venus. I used to think I could do an atlas of Mercury and Venus exploration and I made a good start, but a lifetime isn't long enough to do everything I want to do.
One thing I did notice: USGS's Map-a-planet, which I used to use all the time until it was revamped and made less convenient, had 3 global mosaics corresponding to radar image cycles 1, 2 and 3. One mosaic often helped fill a gap in another. But where a gap still remained, occasionally on those CD-ROMs a later version of a mosaic would include a bit of extra coverage and fill the gap. But searching for that magic tile was a real pain. That's where a fully updated dataset with good map search capabilities would really help - show all products within the selected box. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Sep 11 2020, 11:31 PM
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#3
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Senior Member Group: Members Posts: 2517 Joined: 13-September 05 Member No.: 497 |
I have used the mosaicked (tiled) data, not the raw 'noodle' data (long strip from one orbit). The recollections of a recovering Magellan data processor: The noodle data came in two flavors: the really raw data that Brian is talking about, and the so-called F-BIDR (Full resolution basic image data record, https://pds-geosciences.wustl.edu/missions/...idr/dataset.cat -- map-projected noodles). Even during the mission, I didn't know anyone brave enough to look at the EDRs, and even using the F-BIDRs was considered pretty hard-core; not sure if going back to the EDR would really confer much benefit, but it would require a detailed knowledge of SAR processing. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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