CLEM UVVIS 5-Band Mosaic (MDIM)

MDIM – UVVIS 5-Band Mosaic

Instrument: Ultraviolet/Visible Camera

PDS Data Set ID: CLEM1-L-U-5-DIM-UVVIS-V1.0DOI: 10.17189/1520339

For more information about UVVIS MDIM products, see the Volume Information File or the Data Set Catalog File.

The Ultraviolet/Visible camera (UVVIS) 5-Band Mosaic (MDIM) is a radiometrically and geometrically controlled, photometrically modeled global mosaicked digital image model compiled using more than 400,000 images from multiple spectral observations of the UVVIS. The MDIM is mapped in the Sinusoidal Equal-Area Projection at a resolution of 100 meters per pixel. The mosaic is partitioned into quadrangles or “tiles” equivalent to those of the UVVIS Global Basemap Mosaic (MDIMG). Tiles are stored as image files of approximately 2100 pixels on a side. Pixels are 16-bit signed integers. A phase angle image database, at equivalent resolution, accompanies the MDIM.

Processing for the creation of the MDIM includes radiometric and geometric correction, spectral registration, photometric normalization, and image mosaicking. Radiometric correction applies ‘flat fielding’, dark current subtraction, non-linearity correction, and conversion to radiometric units. Geometric transformations tie each raw image with a ground control network and convert from raw image coordinates to the Sinusoidal Equal-Area projection. Photometric normalization is applied to balance brightness variations due to illumination differences among the images in a mosaic. Images are then mosaicked together to form a global map of continuous image coverage for the entire Moon.

Although not found in ODE, each MDIM product has three corresponding browse images (that can be found in the archive): enhanced color, color ratio, and black/white 750 nm images. The enhanced color images use the 415 nm (blue), 750 nm (green), and 950 nm (red) spectral bands to portray the moon in near-natural color. The color ratio images use the 415/750 (blue), 750/950 (green), and 750/415 (red). The ratio rendition serves to cancel out the dominant brightness variations of the scene (controlled by albedo variations and topographic shading) and enhances color differences related to soil mineralogy and maturity. The lunar highlands, mostly old (~14 b.y.) gabbroic anorthosite rocks, are depicted in shades of red (old) and blue (younger). The lunar maria (~3.8 b.y. to ~2 b.y.), mostly iron-rich basaltic materials of variable titanium content, are portrayed in shades of yellow/orange (iron-rich, low titanium) and blue (iron-rich, higher titanium). Superimposed on and intermingled with these basic units are materials from basins and craters of various ages, ranging from the ancient Serenitatis basin (~3.8 b.y.; red and blue highland rim, filled with younger, yellow-colored low-titanium maria) to the young, fresh crater, Tycho (~100 m.y.; bright blue rays on older, red highland surface).

UVVIS MDIM products have the following file names:

tIaadooo.IMG

where:

t = data type

U = Clementine UVVIS Mosaic

P = Phase angle image

aa = 2-digit truncated integer center latitude of image file (00-90)

d = latitude

N = Positive latitude

S = Negative latitude

ooo = 3-digit truncated integer center longitude of image (000-360)

In ODE, MDIM products have the following product IDs:

TIAADOOO