APOD 14th December 2005 Shadows

Comments and questions about the APOD on the main view screen.
User avatar
JohnD
Tea Time, Guv! Cheerio!
Posts: 1516
Joined: Wed Feb 16, 2005 2:11 pm
Location: Lancaster, England

APOD 14th December 2005 Shadows

Post by JohnD » Wed Dec 14, 2005 7:28 am

All,
The history of criticism and cynicism about shadows in space exploration pics is shameful - eg Apollo - and I enjoy this simulated pic of a Mars Rover on its ground, but ......

The shadow of the Rover is shown as diffuse. Shadows in real pics are sharp. Is this supposed to be during a dust storm?

I know, picky-picky, it's only a simulated pic etc.

What do you think?

John

l3p3r
Science Officer
Posts: 142
Joined: Tue Nov 22, 2005 12:47 pm
Location: Hobart, Australia

Post by l3p3r » Wed Dec 14, 2005 8:50 am

well, for the purposes of showing the rover to scale with the landscape, yes that is a little picky :p

http://www.jpl.nasa.gov/images/mer/2005 ... 23-540.gif

I see what you mean though.
I expect the main reason is that diffuse shadows are easier to draw onto the existing image. :)

Empeda2
Science Officer
Posts: 176
Joined: Sat Oct 29, 2005 9:02 am

Post by Empeda2 » Wed Dec 14, 2005 9:26 am

Hmmm.. difficult to say - Mars has quite a dusty atmosphere, and looking at the 'photo' it looks as though it's being simulated late evening/early morning - more dust to go through - less sharper shadow (the pictures in the link above look like the sun's almost directly overhead...).

Anyway, still 8)
The Artist Formerly Known as Empeda

S. Bilderback
Science Officer
Posts: 235
Joined: Tue Jan 25, 2005 12:12 am
Location: The Enchanted Forests of N. Central USA

Post by S. Bilderback » Wed Dec 14, 2005 12:27 pm

Midday on Mars is about as bright as approaching twilight on Earth.
The more I learn, the more I know what I don't know.

Empeda2
Science Officer
Posts: 176
Joined: Sat Oct 29, 2005 9:02 am

Post by Empeda2 » Wed Dec 14, 2005 12:47 pm

I was looking more at the angle of the shadow - but that's something I forgot of course....
The Artist Formerly Known as Empeda

ta152h0
Schooled
Posts: 1399
Joined: Mon Aug 29, 2005 12:46 am
Location: Auburn, Washington, USA

rover soft shadow

Post by ta152h0 » Thu Dec 15, 2005 3:32 am

The angle of the shadows indicate a low Sun angle and there is not enough atmosphere under the electric panels to diffuse the light. I wish I had the ability to draw that good............
Wolf Kotenberg