Moon atlas

[PeterW]

I think the Cambridge atlas came from Alan Chu home made photo atlas project....

http://www.alanchuhk.com
I printed out a few copies in years gone by.

Peter

[Marvin Jenkins]

Thank you Maniek, for starting this thread. Many links and invaluable tit bits of info.

If it is clear I am going to get up early tomorrow and do a Lunar excursion off the back of all this.

Marv

[Marvin Jenkins]

On 17/12/2019 at 22:20, johninderby said:

Interesting to,compare the LAC chart detail of Plate to a high res image.

Amazing accuracy, takes my breath away. I have noticed one curious thing that has me puzzled. Where in the hi res picture is Plato A? There is clearly something there but it looks like a low lying mountain. There seems to be no crater structure at all and it it clearly shown on the LAC chart along with what looks like a fault line like rupes rector.

M

[johninderby]

Just the angle of the illumination I would think. Here’s another image at more of an angle.

[Marvin Jenkins]

Plato A still looks like a ginger bread star (keeping it in the Christmas spirit) 

[johninderby]

The crater illusion

https://www.universetoday.com/118616/do-you-see-a-mountain-or-a-crater-in-this-picture/

[PeterW]

What size is best to print the LAC at??

 

peter

[Marvin Jenkins]

Thank you for the link, very interesting. I am aware of this phenomenon but the comparison of Plato A between the two pictures LAC and hi res are radically different. My guess is that the LAC image uses data from over lapping images so the complete print has resolution from edge to edge. My second guess is that the hi res picture lacks definition towards it corners as the centre is so crisp.

M

[Marvin Jenkins]

7 minutes ago, PeterW said:

What size is best to print the LAC at??

 

peter

Double decker bus!

[johninderby]

Photos are never as sharp  as visual or at least not in pre lunar orbiting camera days. As the LAC charts are drawings perhaps they combined visual observations and photos to arrive at the finished drawing. 

Edited December 19, 2019 by johninderby