Comments on: You’ve never seen the moon like this . . . https://habitablezone.com/2020/05/09/youve-never-seen-the-moon-like-this/ Tue, 07 Apr 2026 04:28:20 -0700 hourly 1 http://wordpress.org/?v=3.3.1 By: DanS https://habitablezone.com/2020/05/09/youve-never-seen-the-moon-like-this/#comment-44579 DanS Mon, 11 May 2020 15:15:06 +0000 https://www.habitablezone.com/?p=81769#comment-44579 Thank you, ER! Thank you, ER!

]]> By: ER https://habitablezone.com/2020/05/09/youve-never-seen-the-moon-like-this/#comment-44575 ER Sun, 10 May 2020 15:47:54 +0000 https://www.habitablezone.com/?p=81769#comment-44575 <a href="https://www.youtube.com/watch?v=qoi3TH59ZEs" rel="nofollow">like this</a> https://www.youtube.com/watch?v=qoi3TH59ZEs like this

https://www.youtube.com/watch?v=qoi3TH59ZEs

]]> By: hank https://habitablezone.com/2020/05/09/youve-never-seen-the-moon-like-this/#comment-44574 hank Sun, 10 May 2020 00:40:20 +0000 https://www.habitablezone.com/?p=81769#comment-44574 although in the past it was all done in the darkroom, with filters, enlargers, and slow laborious film processing. The idea was to present an image of the entire lunar surface with the level of shadow and detail normally only seen at low-sun angles near the terminator. When the sun is high in the sky, there are no shadows and the surface looks monocolored, flat and plain. At low sun angles, you get a lot more texture and can see the three dimensionality of the surface. Lunar cartography in the pre-photography era required multiple sketches done under a variety of illumination conditions, laboriously combined by skilled draftsmen into a seamless composite that really allowed geomorphologists to study lunar landforms and topography in detail. Clever perspective and shading tricks were used to communicate relative elevations and slopes. There was only limited information in the Z-coordinate (derived by measuring shadows) but a skilled artist's eye could tease a lot of this relief information out of the sketched images. I've even seen detailed contour maps of the lunar surface, although there was no true elevation information implied by the contour spacing and intervals. It was just another way for the artist to communicate his trained eye's perception of shapes on the ground to the viewer. Its all a lost art, now. https://storymaps.arcgis.com/stories/7fa8703759934185a4150510b69a8ea3 although in the past it was all done in the darkroom, with filters, enlargers, and slow laborious film processing. The idea was to present an image of the entire lunar surface with the level of shadow and detail normally only seen at low-sun angles near the terminator. When the sun is high in the sky, there are no shadows and the surface looks monocolored, flat and plain. At low sun angles, you get a lot more texture and can see the three dimensionality of the surface.

Lunar cartography in the pre-photography era required multiple sketches done under a variety of illumination conditions, laboriously combined by skilled draftsmen into a seamless composite that really allowed geomorphologists to study lunar landforms and topography in detail. Clever perspective and shading tricks were used to communicate relative elevations and slopes. There was only limited information in the Z-coordinate (derived by measuring shadows) but a skilled artist’s eye could tease a lot of this relief information out of the sketched images. I’ve even seen detailed contour maps of the lunar surface, although there was no true elevation information implied by the contour spacing and intervals. It was just another way for the artist to communicate his trained eye’s perception of shapes on the ground to the viewer.

Its all a lost art, now.

https://storymaps.arcgis.com/stories/7fa8703759934185a4150510b69a8ea3

]]>