January 3, 2019

Revision as of 01:03, 3 January 2019 by Api (Talk | contribs) (Created page with "__NOTOC__ =Red Arrowhead= Originally published October 25, 2009 <!-- Start of content --> <!-- ws:start:WikiTextHeadingRule:0:<h1> --> <!-- ws:start:WikiTextLocalIm...")

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Red Arrowhead

Originally published October 25, 2009 LPOD-Oct25-09.jpg
image by Rick Evans

I created this image of Mons Hansteen, a lunar red spot, by performing principal component image analysis (PCA) on the five Clementine UVVIS multispectral band images (i.e. 415, 750, 900, 950 and 1000 nm). PCA is a tool sometimes used in multispectral geology studies to reveal variations in mineral composition. Using Photoshop the Clementine images were loaded respectively into five alpha channels of a color image with the R, G and B channels deleted. With all alpha channels selected, FoveaPro 4.0 software was used to create a PCA transform and then to transform the alpha channel images into their respective principal component images. The first three resulting PCA images were then loaded respectively into the R, G and B channels of a color image producing the final image shown above. Mons Hansteen and all other lunar red spot features show up with a very distinctive reddish hue in such images. Lunar red spots seem to absorb preferentially in the ultraviolet region of the spectrum compared to the visible; other lunar mafic features including the central peaks of Tycho are fascinating to observe with this technique as well.

Rick Evans

Lunar History Note: Today is the 184th birthday of perhaps the greatest selenographer of the 19th century -J.F. Julius Schmidt (1825-1884). Thanks to Mark Tillotson for the reminder!

Related Links
Rükl plate 40

Yesterday's LPOD: Das Mystery

Tomorrow's LPOD: Wonder Rille


Register, Log in, and join in the comments.