Venus Map with Feature Names |
Venus Map with Feature Names |
Mar 20 2013, 05:30 PM
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#16
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
This is downright heroic, Machi. I'd like to think that a map like this could get someone thinking about the need to go back to this world, which looks wonderfully new in your work. Incredible.
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Mar 21 2013, 01:07 PM
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#17
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Thanks!
Yes, I hope so too. Venus or especially its surface is still not well understood and available data are not comparable to that, which we have for the Moon or Mars. For example, Magellan's altimeter had pretty low resolution. Every altimetric measurement covers area 100 to 1000 km2 large. For comparison, Mars Global Surveyor MOLA's laser spot had size under 0.1 km2. -------------------- |
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Mar 25 2013, 04:32 PM
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#18
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Junior Member Group: Members Posts: 20 Joined: 19-March 13 Member No.: 6897 |
Thanks so much! Incredibly professional, the best I've seen of any Venus map!
Do you have a source for the elevation data? Ideally I'm looking for something like a greyscale heightmap image (PNG or something), but I'm curious as to what your source was. |
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Mar 25 2013, 05:08 PM
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#19
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
QUOTE Do you have a source for the elevation data? Ideally I'm looking for something like a greyscale heightmap image (PNG or something), but I'm curious as to what your source was. i can post the data i used in simple cylindrical projection from 2048 x1024 up to 65536x32768 pixels in size but it is 16 bit unsigned little endian a 4096x2048 8 bit normalized ( 0 to 255 ) png the remapped "browse" image http://pds-geosciences.wustl.edu/mgn/mgn-v...002/gtdr/sinus/ |
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Mar 26 2013, 12:53 AM
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#20
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Junior Member Group: Members Posts: 20 Joined: 19-March 13 Member No.: 6897 |
Thank you! I plan on using it to make a 3d model (for printing out on Shapeways). If/when I finish it, I'll share it here.
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Mar 26 2013, 01:01 AM
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#21
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
QUOTE Thank you! I plan on using it to make a 3d model (for printing out on Shapeways). If/when I finish it, I'll share it here. then you WILL need a 16 bit image to start with there is a PDS ( .img) Blender 2.6 import tool that takes a PDS DEM and converts it to a sphere or you can use say a perl script to convert the 2d x,y,z( px value) into 3d x,y,z |
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Mar 26 2013, 01:09 AM
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#22
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Junior Member Group: Members Posts: 20 Joined: 19-March 13 Member No.: 6897 |
Thanks, but I think this will work for now. 256 levels isn't too bad for just a bumpy sphere (it will be tessellated anyway); it worked fine for Mars:
http://www.thingiverse.com/thing:26311 EDIT: For clarity, I didn't make that Mars object. |
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Mar 26 2013, 02:02 AM
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#23
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Robotbeat:
If you want elevation data as DEM, then I recommend you DEMs from MG_3003 dataset. Or you can download shape file, which Mark Wieczorek did. -------------------- |
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Nov 28 2013, 08:40 AM
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#24
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Because of the practically unlimited account which I have now on the Flickr, I've uploaded full version of my topographic map of Venus.
Full PDF is available here - Topographic map of Venus - PDF. EDIT(22.1.2022): Updated PDF link. Old one didn't work due to Google's security update. -------------------- |
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Nov 28 2013, 09:01 AM
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#25
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
That PDF is 97 meg
so if you have a slow connection.... ADMIN: The version on Flickr is 57mb |
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Nov 28 2013, 11:33 AM
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#26
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Yep, sorry for that. Both PDF and jpg are really big (~100 and ~60 MB).
I had problems with PDF version in Adobe Acrobat, but it works without problems in Sumatra or SMART viewer. -------------------- |
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Nov 28 2013, 06:03 PM
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#27
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Fantastically detailed & dedicated work, Daniel. Spectacular!!!
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Nov 28 2013, 08:22 PM
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#28
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Member Group: Members Posts: 106 Joined: 26-September 05 Member No.: 508 |
Very beautiful and useful.
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Nov 28 2013, 10:40 PM
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#29
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Senior Member Group: Members Posts: 1089 Joined: 19-February 05 From: Close to Meudon Observatory in France Member No.: 172 |
Because of the practically unlimited account which I have now on the Flickr, I've uploaded full version of my topographic map of Venus. What a GORGEOUS map !!! CONGRATULATIONS !!! Thanks to you Machi, we have also solved an old mistery about Venus : its maximum elevation is 12,177 m (on Maxwell Mountains). Thanks a lot ! |
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Nov 29 2013, 12:18 PM
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#30
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
You're welcome!
Regarding to every elevation on the map, one must be careful, because Magellan's data are pretty bad in comparison with for example MGS's MOLA laser altimeter. Resolution of radar altimeter was pretty low (one spot covers 100 - 1000 km2!) and interpretation of data in diverse terrain really isn't straightforward. Theoretically radar is better for peaks with its threshold signal altimetry than for lowlands with complex terrain where data are sometimes really messy because of multiple reflections from terrain. I wrote more about it on my blog, but you must use google translator. Overall Magellan's data for Venus are comparable to Viking's data for Mars so I recommend to treat them in the same way (as data with great uncertainty). So generally our understanding of the surface of Venus is similar as our understanding of the surface of Mars in late 70's - early 80's. -------------------- |
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