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 Post subject: Re: Vesta
PostPosted: Thu, 02-07-15, 14:46 GMT 
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Joined: Fri, 09-03-12, 16:23 GMT
Posts: 25
Hi John.
Quote:
a very interesting Vesta Topography Map, almost 12K large (exactly 11521 x 5761 pixel)
Quote:
that size 11521 x 5761 is not a multiple of "2" BUT a multiple 360 +1
( the +1 px is do to the CENTER of the px is were latitude and longitude is STARTED )
that size is a 32 ppd image ( 32 pixels per degree )

I noted it, but from my ignorant point of view I simply added a 1 pixel column in order to obtain a 2:1 proportion. Was I so wrong?
Quote:
I think that perhaps you 3D gurus could use it, don't you?
Quote:
not really , but it is cool to look at
for 3d work one NEEDS height data - real or synthetic
that would be the DEM in the first post
Image
DEM = Digital Elevation Model
these pixel values are in Meters or Kilometers of the RADIUS of the body at that point

I know, I followed your work, but I just supposed (and hoped, too) that NASA could have released not only the resulting image but the relevant height data values too, in order to allow their use with the scientific graphic formats (for me absolutely unknown) that I have seen you use fluently.
This was often done.
Anyway, as you say, it's very interesting to see in color the lows-highs distribution on Vesta surface.
Thank you for your very kind explanation.
Bye

Goofy :)

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 Post subject: Re: Vesta
PostPosted: Thu, 02-07-15, 17:40 GMT 
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Joined: Tue, 04-09-07, 21:55 GMT
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Location: N 42.38846 W 83.45456
Quote:
that NASA could have released not only the resulting image but the relevant height data values too, in order to allow their use with the scientific graphic formats


they did
it is the DEM in the first post
the x y values are latitude and longitude
the Z value IS the distance from the center in METERS

http://dawndata.igpp.ucla.edu/tw.jsp?se ... R_HAMO_DTM
the global.cub is a JPL /USGS/NASA ISIS3 image/data format
the global.pds in the NASA/JPL PDS image/data format

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 Post subject: Re: Vesta
PostPosted: Thu, 02-07-15, 21:48 GMT 
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Joined: Fri, 09-03-12, 16:23 GMT
Posts: 25
OK, sorry, now I understand my misunderstanding. :oops:
Great work, John, appreciated.
Bye
Goofy :)

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 Post subject: Re: Vesta
PostPosted: Fri, 03-07-15, 20:34 GMT 
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Joined: Tue, 04-09-07, 21:55 GMT
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no problem

if you want a laugh
shatters on "the way back machine" might have posts from 2002 to 6
some of mine were ( looking back) funny

i just have to keep in mind that my "artistic" views can sometimes come in conflict with others here

this is one reason for the UNALTERED meshes in the one thread

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