The man who drew that picture was Hawaiian native Alika Herring. Alika was, amongst other things, a master optician for the Cave Optical Co. as well as an artist. He went to work for the Lunar Planetary Institute in the Luna Planetary Lab in the early 1960's. At that lab, they used a 61" reflector telescope to observe and map the moon. Imaging was a relatively crude process in those days, and sketching still produced superior results in some realms. But it's how they got the perspective that is really ingenious.
What they did was they projected the image from the scope onto a sphere - a 36" diameter white globe to be exact - and then they photographed the projected image from an overhead perspective. Very clever! Alika then took these images and combined them with his own visual observations to create a full series of lunar limb maps that showed all the features in a then-unprecedented level of accuracy. Of course this was all in the Apollo heyday, when every effort was being expended to learn every thing we could about the moon and it's interesting to learn about the methods employed to get the results that were desired.
Anyone interested in learning more about the history of this limb-drawing process can find the original documents here; https://www.lpl.arizona.edu/sic/collect ... mb-areas-i , and by Googling "rectified drawings of the lunar limb areas".
